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WO2018180700A1 - Émetteur et tube d'irrigation goutte à goutte - Google Patents

Émetteur et tube d'irrigation goutte à goutte Download PDF

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Publication number
WO2018180700A1
WO2018180700A1 PCT/JP2018/010793 JP2018010793W WO2018180700A1 WO 2018180700 A1 WO2018180700 A1 WO 2018180700A1 JP 2018010793 W JP2018010793 W JP 2018010793W WO 2018180700 A1 WO2018180700 A1 WO 2018180700A1
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WO
WIPO (PCT)
Prior art keywords
flow path
tube
emitter
irrigation liquid
discharge
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/JP2018/010793
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English (en)
Japanese (ja)
Inventor
大輔 守越
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Enplas Corp
Original Assignee
Enplas Corp
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Filing date
Publication date
Application filed by Enplas Corp filed Critical Enplas Corp
Publication of WO2018180700A1 publication Critical patent/WO2018180700A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • A01G25/023—Dispensing fittings for drip irrigation, e.g. drippers
    • 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.
  • drip irrigation has been known as one of the plant cultivation methods.
  • the drip irrigation method is a method in which a drip irrigation tube is arranged on the soil in which plants are planted, and irrigation liquid such as water or liquid fertilizer is dropped from the drip irrigation tube to the soil.
  • irrigation liquid such as water or liquid fertilizer
  • a drip irrigation tube usually has a tube formed with a plurality of through holes through which irrigation liquid is discharged, and a plurality of emitters (also referred to as “drippers”) for discharging the irrigation liquid from each through hole.
  • emitters there are known an emitter that is used while being joined to the inner wall surface of the tube (see, for example, Patent Document 1), and an emitter that is used by piercing the tube from the outside.
  • Patent Document 1 describes an emitter bonded to the inner wall surface of a tube.
  • An emitter described in Patent Document 1 includes a first member having a water intake for taking in irrigation liquid, a second member having a discharge port for discharging irrigation liquid, and the first member and the second member. And a membrane member disposed therebetween. Inside the first member, there are formed a valve seat portion arranged so as to surround the water intake port and a decompression groove which becomes a part of the decompression flow path. A through hole is formed in the membrane member at a position corresponding to the downstream end of the decompression groove.
  • the first member, the membrane member, and the second member are stacked to form a decompression flow path, and the membrane member contacts the valve seat portion and closes the water intake.
  • a flow path through which the irrigation liquid flows is formed from the intake port to the discharge port.
  • the membrane member creeps during long-term use. Deformation may occur.
  • creep deformation occurs, the membrane member becomes difficult to return to its original shape when the pressure of the irrigation liquid in the tube is low, so the irrigation liquid discharged from the emitter when the pressure of the irrigation liquid is low It becomes difficult to increase the amount of. It is considered that creep deformation is more likely to occur when the amount of deformation of the membrane member is large.
  • an object of the present invention is to provide an emitter and drip irrigation that can control the amount of irrigation liquid discharged without depending on the pressure of the irrigation liquid in the tube while reducing the deformation amount of the membrane member. Is to provide a tube.
  • an emitter is an inner wall surface of a tube through which an irrigation liquid is circulated, and is joined to a position corresponding to a discharge port communicating between the inside and the outside of the tube, and the emitter in the tube
  • An emitter for quantitatively discharging the irrigation liquid from the discharge port to the outside of the tube the water intake unit for taking in the irrigation liquid, and being disposed facing the discharge port, the irrigation liquid
  • the flow rate of the irrigation liquid is reduced by deformation of the first diaphragm portion according to the pressure of the irrigation liquid in the tube.
  • a discharge flow path connecting the flow reduction section and the discharge section, and the discharge flow path includes a low pressure flow section having a large flow path diameter and a high pressure flow section having a small flow path diameter.
  • the emitter according to the present invention can control the amount of the irrigation liquid that is discharged regardless of the pressure of the irrigation liquid in the tube while reducing the deformation amount of the membrane member.
  • FIG. 1 is a cross-sectional view of a drip irrigation tube according to an embodiment of the present invention.
  • 2A to 2C are diagrams showing the configuration of the emitter according to one embodiment of the present invention.
  • 3A and 3B are diagrams showing the configuration of the emitter according to one embodiment of the present invention.
  • 4A and 4B are diagrams showing the configuration of the emitter according to one embodiment of the present invention.
  • FIG. 5 is a partially enlarged view showing the configuration of the emitter according to one embodiment of the present invention.
  • 6A to 6C are schematic views for explaining the operation of the emitter according to the embodiment of the present invention.
  • FIG. 7 is a partially enlarged view showing a configuration of an emitter according to another embodiment of the present invention.
  • 8A and 8B are partially enlarged views showing the configuration of an emitter according to still another embodiment of the present invention.
  • FIG. 1 is a cross-sectional view in the direction along the axis of the drip irrigation tube 100 according to the present embodiment.
  • the drip irrigation tube 100 has a tube 110 and an emitter 120.
  • the tube 110 is a tube for flowing irrigation liquid.
  • the material of the tube 110 is not particularly limited.
  • the material of the tube 110 is polyethylene.
  • a plurality of discharge ports 112 for discharging irrigation liquid at predetermined intervals (for example, 200 to 500 mm) 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 112 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 112 is 1.5 mm.
  • Emitters 120 are respectively joined to positions corresponding to the discharge ports 112 on the inner wall surface of the tube 110.
  • 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 disposed inside the tube 110.
  • the drip irrigation tube 100 is manufactured by joining the back surface 124 of the emitter 120 to the inner wall surface of the tube 110.
  • the method for joining the tube 110 and the emitter 120 is not particularly limited. Examples of the method for joining the tube 110 and the emitter 120 include welding of a resin material constituting the emitter 120 or the tube 110, adhesion by an adhesive, and the like. Normally, the discharge port 112 is formed after the tube 110 and the emitter 120 are joined, but may be formed before joining.
  • FIG. 2A is a plan view of the emitter 120 before the emitter body 121 and the film 122 are joined
  • FIG. 2B is a plan view of the emitter 120 after the emitter body 121 and the film 122 are joined.
  • 3A is a side view of the emitter 120
  • FIG. 3B is a cross-sectional view taken along line AA shown in FIG. 2B
  • 4A is a side view of the side view of the emitter 120
  • FIG. 4B is a cross-sectional view of the emitter body 121 taken along the line BB shown in FIG. 2B.
  • FIG. 5 is a partially enlarged view of a region C shown in FIG. 3B.
  • the emitter 120 is joined to the inner wall surface of the tube 110 so as to cover the discharge port 112.
  • the shape of the emitter 120 is not particularly limited as long as it can adhere to the inner wall surface of the tube 110 and cover the discharge port 112.
  • the shape of the back surface 124 joined to the inner wall surface of the tube 110 in the cross section of the emitter 120 perpendicular to the axial direction of the tube 110 is formed on the inner wall surface of the tube 110 so as to be along the inner wall surface of the tube 110. It has a generally arc shape that is convex toward the top.
  • the planar shape of the emitter 120 is a substantially rectangular shape with four corners rounded.
  • the size of the emitter 120 is not particularly limited. In the present embodiment, the length of the emitter 120 in the long side direction is 25 mm, the length in the short side direction is 8 mm, and the height is 2.5 mm.
  • the emitter 120 is joined to the inner wall surface of the tube 110, and the emitter body 121 is joined to the emitter body 121.
  • the emitter main body 121 and the film 122 may be formed integrally or may be formed separately. In the present embodiment, the emitter main body 121 and the film 122 are integrally formed via the hinge portion 123.
  • Both the emitter body 121 and the film 122 are preferably formed of one kind of flexible material.
  • the emitter main body 121 and the film 122 including the diaphragm portion are integrally formed of one kind of flexible material.
  • the material of the emitter body 121 and the film 122 include resin and rubber.
  • the resin include polyethylene and silicone. The flexibility of the emitter main body 121 and the film 122 can be adjusted by using an elastic resin material.
  • Examples of a method for adjusting the flexibility of the emitter body 121 and the film 122 include selection of a resin having elasticity and adjustment of a mixing ratio of a resin material having elasticity with respect to a hard resin material.
  • the integrally molded product of the emitter main body 121 and the film 122 can be manufactured by injection molding, for example.
  • the emitter 120 includes a water intake 150, a first connection groove 131 that is a part of the first connection flow path 141, a first pressure reduction groove 132 that is a part of the first pressure reduction flow path 142, and a second connection flow path.
  • a third connection groove 136 serving as a part of the three connection flow path 146, a flow rate reducing unit 160, a flow path opening / closing unit 170, and a discharge unit 180 are provided.
  • the water intake unit 150, the flow rate reduction unit 160, and the flow path opening / closing unit 170 are disposed on the surface 125 side of the emitter 120.
  • the first connection groove 131, the first pressure reduction groove 132, the second connection groove 133, the second pressure reduction groove 134, the third pressure reduction groove 135, the third connection groove 136, and the discharge unit 180 are disposed on the back surface 124 side of the emitter 120.
  • Each flow path disposed on the front surface 125 side of the emitter 120 and each flow path disposed on the back surface 124 side of the emitter 120 are communicated with each other through a through-hole described later. These through holes also form part of the flow path.
  • the third connection channel 146 includes a channel opening / closing through hole 173 that connects the channel opening / closing part 170 and the third connection groove 136, the third connection groove 136, the third connection groove 136, and the flow rate reducing unit 160. And a second connection through hole 166 that connects the two.
  • the through hole that connects the flow path opening / closing section 170 and the discharge section 180 is also referred to as a discharge flow path 147.
  • the first connection groove 131, the first decompression groove 132, the second connection groove 133, the second decompression groove 134, the third decompression groove 135, and the third connection groove 136 are respectively The first connection channel 141, the first decompression channel 142, the second connection channel 143, the second decompression channel 144, the third decompression channel 145 and a part of the third connection channel 146 are formed. Thereby, it is comprised from the intake part 150, the 1st connection flow path 141, the 1st pressure reduction flow path 142, the 2nd connection flow path 143, the 2nd pressure reduction flow path 144, the flow volume reduction
  • a first flow path connecting the water intake unit 150 and the discharge unit 180 is formed. Further, the water intake 150, the first connection channel 141, the first decompression channel 142, the second connection channel 143, the third decompression channel 145, the channel opening / closing unit 170, the third connection channel 146, the channel reduction Part 160, discharge channel 147 and discharge unit 180, and a second channel connecting water intake unit 150 and discharge unit 180 is formed. In both the first channel and the second channel, the irrigation liquid is circulated from the water intake unit 150 to the discharge unit 180. In the present embodiment, the first flow path and the second flow path overlap between the water intake section 150 and the second connection flow path 143. In addition, the first flow path and the second flow path overlap between the flow rate reduction unit 160 and the discharge unit 180.
  • the water intake 150 is disposed in a region about half of the surface 125 of the emitter 120 (see FIGS. 2A and 2B). In the region of the surface 125 where the water intake unit 150 is not arranged, a flow rate reducing unit 160 and a flow path opening / closing unit 170 (film 122) are arranged.
  • the water intake unit 150 includes a water intake side screen unit 151 and a water intake through hole 152.
  • the water intake side screen unit 151 prevents the suspended matter in the irrigation liquid taken into the emitter 120 from entering the water intake recess 153.
  • the water intake side screen portion 151 is open to the inside of the tube 110 and has a water intake recess 153, a plurality of slits 154, and a plurality of ridges 155.
  • the water intake recess 153 is one recess formed on the entire surface 125 of the emitter 120 where the film 122 is not bonded.
  • the depth of the water intake recess 153 is not particularly limited, and is appropriately set depending on the size of the emitter 120.
  • a plurality of slits 154 are formed on the outer peripheral wall of the water intake recess 153, and a plurality of ridges 155 are formed on the bottom surface of the water intake recess 153.
  • a water intake through hole 152 is formed on the bottom surface of the water intake recess 153.
  • the plurality of slits 154 connect the inner surface of the water intake recess 153 and the outer surface of the emitter body 121, while taking the irrigation liquid from the side surface of the emitter body 121 into the water recess 153. Is prevented from entering the water intake recess 153.
  • the shape of the slit 154 is not particularly limited as long as the above function can be exhibited. In the present embodiment, the shape of the slit 154 is formed such that the width increases from the outer surface of the emitter body 121 toward the inner surface of the water intake recess 153 (see FIGS. 2A and 2B). Thus, since the slit 154 is configured to have a so-called wedge wire structure, the pressure loss of the irrigation liquid flowing into the water intake recess 153 is suppressed.
  • the plurality of ridges 155 are arranged on the bottom surface of the water intake recess 153.
  • the arrangement and number of the ridges 155 are not particularly limited as long as the irrigation liquid can be taken in from the opening side of the water intake recess 153 and the intrusion of suspended matter in the irrigation liquid can be prevented.
  • the plurality of ridges 155 are arranged such that the major axis direction of the ridges 155 is along the minor axis direction of the emitter 120. Further, the ridge 155 is formed so that the width decreases from the surface 125 of the emitter main body 121 toward the bottom surface side of the water intake recess 153.
  • the space between the adjacent ridges 155 has a so-called wedge wire structure.
  • lines 155 will not be specifically limited if the above-mentioned function can be exhibited.
  • the space between the adjacent ridges 155 is configured to have a so-called wedge wire structure, the pressure loss of the irrigation liquid flowing into the water intake recess 153 is suppressed.
  • the water intake through hole 152 is formed on the bottom surface of the water intake recess 153.
  • the shape and number of the water intake through holes 152 are not particularly limited as long as the irrigation liquid taken into the water intake recess 153 can be taken into the emitter body 121.
  • the water intake through hole 152 is a single long hole formed along the major axis direction of the emitter 120 on the bottom surface of the water intake recess 153. Since the long holes are partially covered by the plurality of ridges 155, the water intake through holes 152 appear to be divided into a large number of through holes when viewed from the surface 125 side.
  • the irrigation liquid that has flowed through the tube 110 is taken into the emitter main body 121 while preventing the floating substance from entering the water intake recess 153 by the water intake side screen portion 151.
  • the first connection groove 131 (first connection flow path 141) connects the water intake through hole 152 (water intake section 150) and the first pressure reduction groove 132.
  • the first connection groove 131 is formed linearly along the major axis direction of the emitter 120 at the outer edge portion of the back surface 124.
  • the first connection channel 141 is formed by the first connection groove 131 and the inner wall surface of the tube 110.
  • the irrigation liquid taken in from the water intake unit 150 flows through the first connection channel 141 to the first decompression channel 142.
  • the first pressure reducing groove 132 (first pressure reducing flow path 142) is disposed in the first flow path and the second flow path upstream of the flow rate reducing unit 160, and the first connection groove 131 (first connection flow path 141). ) And the second connection groove 133 (second connection flow path 143).
  • the first decompression groove 132 (first decompression channel 142) reduces the pressure of the irrigation liquid introduced from the water intake 150 and guides it to the second connection groove 133 (second connection channel 143).
  • the first decompression groove 132 is linearly arranged along the major axis direction of the emitter 120 at the outer edge portion of the back surface 124.
  • the upstream end of the first decompression groove 132 is connected to the first connection groove 131, and the downstream end of the first decompression groove 132 is connected to the upstream end of the second connection groove 133.
  • the shape of the first decompression groove 132 is not particularly limited as long as the above-described function can be exhibited.
  • the plan view shape of the first decompression groove 132 is a zigzag shape.
  • first triangular protrusions 132a having a substantially triangular prism shape protruding from the inner surface are alternately arranged along the direction in which the irrigation liquid flows.
  • the first convex portion 132 a is arranged so that the tip does not exceed the central axis of the first decompression groove 132 when viewed in plan.
  • the first decompression channel 142 is formed by the first decompression groove 132 and the inner wall surface of the tube 110.
  • the irrigation liquid taken in from the water intake unit 150 is decompressed by the first decompression channel 142 and guided to the second connection groove 133 (second connection channel 143).
  • the second connection groove 133 (second connection flow path 143) includes a first pressure reduction groove 132 (first pressure reduction flow path 142), a second pressure reduction groove 134 (second pressure reduction flow path 144), and a third pressure reduction groove 135 ( A third decompression channel 145) is connected.
  • the second connection groove 133 is formed linearly along the minor axis direction of the emitter 120 at the outer edge portion of the back surface 124.
  • the second connection channel 143 is formed by the second connection groove 133 and the inner wall surface of the tube 110.
  • the second decompression groove 134 (second decompression flow path 144) is disposed in the first flow path upstream of the flow rate reduction unit 160, and the second connection groove 133 (second connection flow path 143) and the flow rate reduction.
  • the unit 160 is connected.
  • the second decompression groove 134 (second decompression flow path 144) reduces the pressure of the irrigation liquid that has flowed in from the second connection groove 133 (second connection flow path 143) and guides it to the flow rate reduction unit 160.
  • the second decompression groove 134 is disposed along the major axis direction of the emitter 120 at the outer edge portion of the back surface 124.
  • the upstream end of the second decompression groove 134 is connected to the downstream end of the second connection groove 133, and the downstream end of the second decompression groove 134 is connected to the first connection through-hole 165 communicating with the flow rate reducing portion 160.
  • the shape of the second decompression groove 134 is not particularly limited as long as the above-described function can be exhibited.
  • the plan view shape of the second decompression groove 134 is a zigzag shape similar to the shape of the first decompression groove 132.
  • substantially triangular prism-shaped second protrusions 134a protruding from the inner surface are alternately arranged along the direction in which the irrigation liquid flows.
  • the second convex portion 134a is arranged so that the tip does not exceed the central axis of the second decompression groove 134 when viewed in plan.
  • the second decompression channel 144 is formed by the second decompression groove 134 and the inner wall surface of the tube 110.
  • the second decompression groove 134 (second decompression channel 144) is longer than a third decompression groove 135 (third decompression channel 145) described later. Therefore, the irrigation liquid flowing through the second decompression groove 134 (second decompression flow path 144) is decompressed more than the irrigation liquid flowing through the third decompression groove 135 (third decompression flow path 145).
  • a part of the irrigation liquid taken in from the water intake unit 150 and decompressed in the first decompression channel 142 is decompressed by the second decompression channel 144 and guided to the flow rate reduction unit 160.
  • the third decompression groove 135 (third decompression channel 145) is disposed in the second channel upstream of the channel opening / closing part 170, and is connected to the second connection groove 133 (second connection channel 143).
  • the road opening / closing part 170 is connected.
  • the third decompression groove 135 (third decompression flow path 145) reduces the pressure of the irrigation liquid flowing in from the second connection groove 133 (second connection flow path 143) and guides it to the flow path opening / closing part 170.
  • the third decompression groove 135 is disposed along the major axis direction of the emitter 120 in the central portion of the back surface 124.
  • the upstream end of the third decompression groove 135 is connected to the second connection channel 143, and the downstream end of the third decompression groove 135 is connected to the third connection through-hole 174 communicating with the channel opening / closing part 170.
  • the shape of the third decompression groove 135 is not particularly limited as long as the above function can be exhibited.
  • the plan view shape of the third decompression groove 135 is a zigzag shape similar to the shape of the first decompression groove 132.
  • substantially triangular prism-shaped third projections 135a protruding from the inner surface are alternately arranged along the direction in which the irrigation liquid flows.
  • the third convex portion 135a is arranged so that the tip does not exceed the central axis of the third decompression groove 135 when viewed in plan.
  • a third decompression channel 145 is formed by the third decompression groove 135 and the inner wall surface of the tube 110.
  • the other part of the irrigation liquid taken in from the water intake unit 150 and decompressed in the first decompression channel 142 is decompressed by the third decompression channel 145 and guided to the channel opening / closing unit 170.
  • the second flow path functions only when the pressure of the irrigation liquid is low.
  • the flow rate reducing unit 160 is disposed between the second decompression channel 144 (second decompression groove 134) and the ejection channel 147 in the first channel, and is disposed on the surface 125 side of the emitter 120. Yes.
  • the flow rate reduction unit 160 sends the irrigation liquid to the discharge unit 180 while reducing the flow rate of the irrigation liquid according to the pressure of the irrigation liquid in the tube 110.
  • the configuration of the flow rate reducing unit 160 is not particularly limited as long as the above-described function can be exhibited.
  • the flow rate reducing portion 160 includes a flow rate reducing recess 161, a first valve seat portion 162, a communication groove 163, and a flow rate reducing through-hole 164 communicating with the discharge portion 180 (discharge flow path 147).
  • a flow rate reducing through hole 164 communicating with the discharge unit 180, a first connection through hole 165 communicating with the second pressure reducing groove 134 (second pressure reducing channel 144), and a first A second connection through hole 166 communicating with the third connection groove 136 (third connection flow path 146) is opened.
  • the plan view shape of the concave portion 161 for reducing the flow rate is a substantially circular shape.
  • a first connection connection connected to the flow rate reducing through hole 164 (discharge channel 147) communicating with the discharge unit 180 and the second pressure reducing groove 134 (second pressure reducing channel 144).
  • a through hole 165, a second connection through hole 166 communicating with the third connection groove 136 (third connection flow path 146), and a first valve seat portion 162 are disposed.
  • the depth of the flow rate reducing recess 161 is not particularly limited as long as it is equal to or greater than the depth of the communication groove 163.
  • the first valve seat 162 is disposed on the bottom surface of the flow rate reducing recess 161 so as to surround the flow rate reducing through hole 164.
  • the first valve seat 162 is formed so that the first diaphragm 167 can be in close contact when the pressure of the irrigation liquid flowing through the tube 110 is equal to or higher than the second pressure.
  • the flow rate of the irrigation liquid flowing from the flow rate reducing recess portion 161 into the discharge portion 180 is decreased.
  • the shape of the 1st valve seat part 162 will not be specifically limited if the above-mentioned function can be exhibited.
  • the shape of the first valve seat portion 162 is an annular convex portion.
  • the end surface of the annular convex portion has a height from the bottom surface of the flow rate reducing concave portion 161 that decreases from the inside toward the outside.
  • a communication groove 163 that communicates the inside of the flow rate reducing recess 161 and the flow rate reducing through hole 164 is formed in a part of the region where the first diaphragm portion 167 of the first valve seat 162 can be in close contact.
  • the first connection through hole 165 communicated with the second decompression groove 134 (second decompression flow path 144) and the second connection through hole 166 communicated with the third connection groove 136 (third connection flow path 146) are:
  • the bottom surface of the flow rate reducing recess 161 is formed in a region where the first valve seat 162 is not disposed.
  • the first connection through hole 165 communicating with the second decompression groove 134 (second decompression flow path 144) is disposed so as to be surrounded by the first valve seat 162, and is used for reducing the flow rate communicating with the discharge unit 180.
  • the through hole 164 may be disposed outside the first valve seat portion 162.
  • the flow rate reducing through-hole 164 (discharge channel 147) is disposed at the center of the bottom surface of the flow rate reducing recess 161, and is connected to the flow rate reducing unit 160 at the first opening 164a and at the second opening 164b.
  • the discharge unit 180 is connected.
  • the discharge flow path 147 has a larger flow path diameter, a low-pressure circulation part 164c through which irrigation liquid can flow even at low pressure, and a smaller flow path diameter for irrigation unless the pressure is high.
  • a high-pressure circulation part 164d through which liquid is difficult to circulate. More specifically, the high-pressure flow part 164d has a flow path diameter decreasing part in which the flow path diameter continuously decreases in the flow direction of the irrigation liquid.
  • the end of the high-pressure circulation part 164d on the discharge part 180 side is a second opening part 164b.
  • the discharge channel 147 has the largest channel diameter at the first opening 164 a that opens to the flow rate reducing unit 160, and the smallest channel diameter at the second opening 164 b that opens to the discharge unit 180.
  • the first diaphragm portion 167 is a part of the film 122.
  • the first diaphragm portion 167 is disposed so as to block communication between the inside of the flow rate reducing recess 161 and the inside of the tube 110.
  • the first diaphragm portion 167 has flexibility and is deformed so as to contact the first valve seat portion 162 according to the pressure of the irrigation liquid in the tube 110. Specifically, the first diaphragm portion 167 deforms toward the first valve seat portion 162 as the pressure of the irrigation liquid increases, and eventually comes into contact with the first valve seat portion 162.
  • the first diaphragm portion 167 blocks the first connection through hole 165, the flow rate reduction through hole 164, and the communication groove 163. Therefore, the irrigation liquid sent from the first connection through hole 165 can be sent to the discharge unit 180 through the communication groove 163 and the flow rate reduction through hole 164.
  • the first diaphragm portion 167 is disposed adjacent to a second diaphragm portion 175 described later.
  • the channel opening / closing unit 170 is disposed between the third decompression channel 145 (third decompression groove 135) and the discharge unit 180 in the second channel, and is disposed on the surface 125 side of the emitter 120. Yes.
  • the channel opening / closing unit 170 opens and closes the second channel according to the pressure in the tube 110 and sends the irrigation liquid to the discharge unit 180.
  • the channel opening / closing part 170 is connected to the flow rate reducing unit 160 via the channel opening / closing through hole 173, the third connection channel 146, and the second connection through hole 166.
  • the irrigation liquid from the decompression channel 145 (third decompression groove 135) reaches the discharge unit 180 through the channel opening / closing unit 170, the third connection channel 146, and the flow rate reduction unit 160.
  • the configuration of the flow path opening / closing portion 170 is not particularly limited as long as the above-described function can be exhibited.
  • the channel opening / closing part 170 is a channel opening / closing through hole that communicates with the channel opening / closing recess 171, the second valve seat 172, and the second connection through hole 166 of the flow rate reducing unit 160.
  • a third connection through hole 174 communicating with the third decompression channel 145 (third decompression groove 135) and a channel opening / closing through hole 173 communicating with the flow rate reducing unit 160 are provided. And are open.
  • the channel opening / closing recess 171 communicates with the flow rate reducing recess 161 of the flow rate reducing unit 160.
  • the plan view shape of the channel opening / closing recess 171 is substantially circular.
  • a third connection through hole 174 connected to the third decompression groove 135, a channel opening / closing through hole 173 connected to the third connection channel 146, and a second A valve seat 172 is disposed on the bottom surface of the channel opening / closing recess 171.
  • the end surface of the second valve seat portion 172 is disposed closer to the surface 125 than the end surface of the first valve seat portion 162. That is, the second valve seat portion 172 is formed higher than the first valve seat portion 162. Accordingly, when the film 122 is deformed by the pressure of the irrigation liquid, the film 122 contacts the second valve seat portion 172 before the first valve seat portion 162.
  • the third connection through hole 174 communicating with the third decompression groove 135 is formed in a region where the second valve seat 172 is not disposed on the bottom surface of the flow path opening / closing recess 171.
  • the second valve seat 172 is disposed on the bottom surface of the channel opening / closing recess 171 so as to surround the channel opening / closing through hole 173.
  • the second valve seat portion 172 is disposed in a non-contact manner facing the second diaphragm portion 175, and when the pressure of the irrigation liquid flowing through the tube 110 is equal to or higher than the first pressure, the second diaphragm portion 175 can be in close contact. It is formed as follows.
  • the second diaphragm portion 175 When the pressure of the irrigation liquid flowing through the tube 110 is equal to or higher than the first pressure, the second diaphragm portion 175 is in close contact with the second valve seat portion 172 and closes the flow passage opening / closing through-hole 173, resulting in the second Block the flow path.
  • the shape of the 2nd valve seat part 172 will not be specifically limited if the above-mentioned function can be exhibited.
  • the second valve seat portion 172 is an annular convex portion arranged so as to surround the flow passage opening / closing through hole 173.
  • the second diaphragm portion 175 is a part of the film 122 and is disposed adjacent to the first diaphragm portion 167.
  • the second diaphragm portion 175 is disposed so as to block communication between the inside of the channel opening / closing recess 171 and the inside of the tube 110.
  • the second diaphragm portion 175 has flexibility and is deformed so as to contact the second valve seat portion 172 in accordance with the pressure of the irrigation liquid in the tube 110. Specifically, the second diaphragm portion 175 is deformed toward the second valve seat portion 172 as the pressure of the irrigation liquid increases, and when the pressure of the irrigation liquid reaches the first pressure, Contact the seat 172. As a result, the second flow path (flow path opening / closing through hole 173) is closed.
  • the discharge unit 180 is disposed on the back surface 124 side of the emitter 120 so as to face the discharge port 112.
  • the discharge unit 180 sends the irrigation liquid from the flow rate reducing through-hole 164 to the discharge port 112 of the tube 110. Accordingly, the discharge unit 180 can discharge the irrigation liquid to the outside of the emitter 120.
  • the structure of the discharge part 180 will not be specifically limited if the above-mentioned function can be exhibited.
  • the discharge unit 180 includes a discharge recess 181 and an intrusion prevention unit 182.
  • the discharge recess 181 is disposed on the back surface 124 side of the emitter 120.
  • the shape of the discharge recess 181 in plan view is substantially rectangular.
  • a flow rate reducing through hole 164 and an intrusion prevention unit 182 are arranged on the bottom surface of the discharge recess 181.
  • the intrusion prevention unit 182 prevents intrusion of foreign matter from the discharge port 112.
  • the intrusion prevention unit 182 is not particularly limited as long as it can perform the above-described function.
  • intrusion prevention unit 182 has two protruding strips 183 disposed adjacent to each other. The two ridges 183 are arranged so as to be positioned between the flow rate reducing through hole 164 and the discharge port 112 when the emitter 120 is joined to the tube 110.
  • the film 122 is formed of a flexible resin material.
  • the material of the film 122 can be appropriately set according to the desired flexibility.
  • Examples of the resin include polyethylene.
  • the flexibility of the film 122 can also be adjusted by using a resin material having elasticity.
  • An example of a method for adjusting the flexibility of the film 122 is the same as the method for adjusting the flexibility of the emitter body 121.
  • the shape and size of the film 122 can be appropriately set according to the size of the emitter main body 121 and the through holes and recesses formed in the emitter main body 121.
  • the thickness of the film 122 can be appropriately set according to the desired flexibility.
  • the film 122 can be manufactured by injection molding, for example.
  • the hinge portion 123 is connected to a part of the surface 125 of the emitter body 121.
  • the thickness of the hinge portion 123 is the same as that of the film 122 and is integrally formed with the emitter body 121 and the film 122.
  • the film 122 may be prepared as a separate body from the emitter body 121 and bonded to the emitter body 121.
  • the emitter 120 is configured by rotating the film 122 around the hinge portion 123 and joining it to the surface 125 of the emitter body 121.
  • a method for joining the emitter body 121 and the film 122 is not particularly limited. Examples of the method of joining the emitter body 121 and the film 122 include welding of a resin material constituting the film 122, adhesion with an adhesive, and the like. In addition, you may cut
  • irrigation liquid is fed into the tube 110.
  • irrigation liquids include water, liquid fertilizers, pesticides and mixtures thereof.
  • the pressure of the irrigation liquid fed to the drip irrigation tube 100 is preferably 0.1 MPa or less so that the drip irrigation method can be easily introduced and the tube 110 and the emitter 120 are prevented from being damaged.
  • the irrigation liquid in the tube 110 is taken into the emitter 120 from the water intake unit 150. Specifically, the irrigation liquid in the tube 110 enters the water intake recess 153 through the slit 154 or the gap between the protrusions 155 and passes through the water intake through hole 152.
  • the water intake part 150 has the water intake side screen part 151 (gap between the slit 154 and the protrusion 155), the suspended
  • the irrigation liquid taken from the water intake unit 150 reaches the first connection channel 141.
  • the irrigation liquid that has reached the first connection channel 141 passes through the first decompression channel 142 and reaches the second connection channel 143.
  • the irrigation liquid that has reached the second connection channel 143 flows into the second decompression channel 144 and the third decompression channel 145.
  • the irrigation liquid advances in advance through the third decompression channel 145 having a shorter channel length and less pressure loss than the second decompression channel 144.
  • the irrigation liquid that has flowed into the third decompression flow path 145 flows into the flow path opening / closing part 170 through the third connection through hole 174.
  • the irrigation liquid that has flowed into the flow path opening / closing section 170 flows into the flow rate reducing section 160 through the flow path opening / closing through hole 173, the third connection flow path 146, and the second connection through hole 166.
  • the irrigation liquid that has flowed into the flow rate reduction unit 160 flows into the discharge unit 180 through the flow rate reduction through hole 164.
  • the irrigation liquid that has flowed into the discharge unit 180 is discharged from the discharge port 112 of the tube 110 to the outside of the tube 110.
  • the irrigation liquid that has flowed into the second decompression flow path 144 flows into the flow rate reduction unit 160 through the first connection through hole 165.
  • the irrigation liquid that has flowed into the flow rate reduction unit 160 flows into the discharge unit 180 through the flow rate reduction through hole 164.
  • the irrigation liquid that has flowed into the discharge unit 180 is discharged out of the tube 110 from the discharge port 112 of the tube 110.
  • the flow channel opening / closing portion 170 and the flow rate reducing portion 160 communicate with each other via the flow channel opening / closing through hole 173 and the second connection through hole 166.
  • the flow rate reducing unit 160 controls the flow rate of the irrigation liquid by deforming the first diaphragm unit 167 according to the pressure of the irrigation liquid in the tube 110, and the flow path opening / closing unit 170 controls the flow rate in the tube 110.
  • the flow rate of the irrigation liquid is controlled by deforming the second diaphragm portion 175 according to the pressure of the irrigation liquid. Therefore, the operation of the flow rate reducing unit 160 and the flow path opening / closing unit 170 according to the pressure of the irrigation liquid in the tube 110 will be described.
  • FIGS. 6A to 6C are schematic diagrams showing the operational relationship between the flow rate reducing unit 160 and the flow path opening / closing unit 170.
  • FIG. 6A to 6C are diagrams schematically showing a cross section taken along the line DD shown in FIG. 2B in order to explain the operation of the emitter 120.
  • 6A is a cross-sectional view when the irrigation liquid is not supplied to the tube 110
  • FIG. 6B is a cross-sectional view when the pressure of the irrigation liquid in the tube 110 is the first pressure
  • FIG. 6C is a cross-sectional view when the pressure of the irrigation liquid in the tube 110 is the second pressure exceeding the first pressure.
  • the first diaphragm portion 167 and the second diaphragm portion 175 are not deformed (see FIG. 6A).
  • the first diaphragm portion 167 of the flow rate reducing portion 160 starts to deform toward the first valve seat portion 162.
  • the second diaphragm part 175 of the flow path opening / closing part 170 starts to deform toward the second valve seat part 172.
  • the irrigated liquid thus discharged is discharged to the outside from the discharge port 112 of the tube 110 through both the first flow path and the second flow path.
  • the irrigation liquid taken from the water intake unit 150 is the first flow. It is discharged through both the channel and the second channel.
  • the second diaphragm portion 175 contacts the second valve seat portion 172 and closes the second flow path (see FIG. 6B). At this time, the first diaphragm portion 167 is not in contact with the first valve seat portion 162.
  • the second diaphragm portion 175 is close to the second valve seat portion 172, and thus is discharged through the second flow path. The amount of irrigation liquid is reduced.
  • the irrigation liquid in the second flow path is not discharged from the discharge unit 180.
  • the irrigation liquid taken from the water intake unit 150 is discharged from the discharge unit 180 of the tube 110 to the outside through only the first flow path.
  • the first diaphragm portion 167 When the pressure of the irrigation liquid in the tube 110 is further increased, the first diaphragm portion 167 is further deformed toward the first valve seat portion 162. Normally, as the pressure of the irrigation liquid increases, the amount of the irrigation liquid flowing through the first flow path should increase, but in the emitter 120 according to the present embodiment, the irrigation liquid in the second flow path. The pressure between the first diaphragm 167 and the first valve seat 162 is reduced, thereby preventing an excessive increase in the amount of irrigation liquid flowing through the first flow path. Then, when the pressure of the irrigation liquid in the tube 110 is equal to or higher than the second pressure exceeding the first pressure, the first diaphragm portion 167 contacts the first valve seat portion 162 (see FIG. 6C).
  • the irrigation liquid introduced from the water intake portion 150 passes through the communication groove 163, and the tube. 110 is discharged from the discharge unit 180 to the outside.
  • the flow rate reducing unit 160 makes the first flow path when the first diaphragm portion 167 contacts the first valve seat portion 162. The increase in the amount of irrigation liquid flowing through
  • the emitter 120 has the discharge channel 147 having the high-pressure circulation part, so that the internal pressure of the flow rate reduction unit 160 is the discharge flow having no high-pressure circulation part. It becomes higher than the internal pressure of the flow rate reducing portion 160 in the emitter having the path 147. As a result, the pressure difference between the pressure of the irrigation liquid flowing through the tube 110 and the internal pressure of the flow rate reducing unit 160 becomes smaller, and the first diaphragm unit 167 is more difficult to deform.
  • the pressure (second pressure) necessary for the first diaphragm portion 167 to reach the first valve seat portion 162 is also increased at the same time.
  • the second pressure is further decreased by simultaneously increasing the height of the first valve seat 162, and the liquid amount of the irrigation liquid is increased. What is necessary is just to adjust the pressure (2nd pressure) which the flow volume reduction part 160 suppresses increase.
  • the discharge channel 147 connecting the flow rate reducing unit 160 and the discharge unit 180 includes a low-pressure circulation unit having a large channel diameter and a high-pressure circulation unit having a small channel diameter. And have.
  • the discharge flow path 147 having the high-pressure circulation part makes it possible to suppress an increase in the amount of irrigation liquid by the flow rate reduction part 160 at a predetermined second pressure while reducing the deformation amount of the first diaphragm part 167. For this reason, the first diaphragm portion 167 is unlikely to undergo creep deformation and easily returns to its original shape when the pressure of the irrigation liquid in the tube 110 becomes small. Therefore, the first diaphragm portion 167 does not depend on the pressure of the irrigation liquid in the tube 110. The irrigation liquid can be dripped quantitatively.
  • the first diaphragm portion 167 is deformed more largely than the second diaphragm portion 175. Therefore, creep deformation is more likely to occur in the first diaphragm portion 167 than in the second diaphragm portion 175.
  • the discharge flow path 147 having a high-pressure circulation part is used, so that creep deformation is suppressed and the discharge amount when the pressure of the irrigation liquid is small is adjusted. This effect is more noticeable.
  • the discharge channel 147 has the largest channel diameter in the first opening 164 a that opens to the flow rate reducing unit 160, and the second opening that opens to the discharge unit 180.
  • the flow path diameter is the smallest and the through hole does not increase in the flow direction of the irrigation liquid, so that it can be easily pulled out from the mold during molding using the mold. .
  • the configurations of the emitter and the drip irrigation tube according to the present invention are not limited to the emitter 120 and the drip irrigation tube 100 according to the above embodiment.
  • the discharge channel 147 does not have to be a through hole having the smallest channel diameter in the second opening 164b that opens to the discharge unit 180, and a high-pressure circulation part is provided in the middle of the through hole as shown in FIG.
  • the high-pressure circulation part may be provided in a region including the first opening 164a.
  • the opening diameter of the second opening 164b may be larger than the flow path diameter of the high-pressure circulation part.
  • the discharge flow path 147 does not need to have a flow path diameter decreasing portion in which the flow path diameter continuously decreases as a high-pressure circulation section, and may have a region in which the flow path diameter decreases discontinuously (stepped). .
  • the discharge flow path 147 may have a shape like a screw hole, for example, as shown in FIG.
  • the internal pressure of the flow rate reducing portion 160 can be increased at the crest portion 164e of the screw hole (the portion where the flow path diameter becomes narrow).
  • the irrigation liquid can flow along the valley 164f of the screw hole (portion in which the flow path diameter is widened), it is possible to make it difficult for the flow rate to decrease while providing the high-pressure circulation portion.
  • the twist angle of the screw part formed in the discharge channel 147 having a shape like a screw hole can be arbitrarily determined in a range of 3 ° to 20 °, for example, 10 ° shown in FIG. The angle may be 5 ° shown in FIG. 8B.
  • the discharge flow path 147 does not need to be a through hole, and the flow rate reducing through hole 164 disposed from the flow rate reducing unit 160 toward the back surface 124 of the emitter 120 and the connection disposed at the back surface 124 of the emitter 120.
  • channel and the connection flow path formed of the inner wall face of the tube 110 may be sufficient.
  • the amount of deformation of the membrane member is further reduced to suppress creep deformation of the membrane member, and the amount of irrigation liquid discharged can be controlled regardless of the pressure of the irrigation liquid in the tube. It is possible to easily provide a possible emitter. Therefore, according to the present invention, it is expected that the emitter will be widely used in technical fields that require long-term dripping, such as drip irrigation and durability tests, and that the technical field will be further developed.

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  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental Sciences (AREA)
  • Reciprocating Pumps (AREA)
  • Nozzles (AREA)

Abstract

L'objectif de la présente invention est de fournir un émetteur apte à réguler la quantité d'un liquide d'irrigation évacué sans dépendre de la pression du liquide d'irrigation à l'intérieur d'un tube, tout en réduisant encore la quantité de déformation d'un élément de membrane. L'objectif qui précède est atteint grâce à un émetteur comprenant : une partie d'admission d'eau pour prélever le liquide d'irrigation ; une partie d'évacuation disposée en face de l'orifice d'évacuation, la partie d'évacuation étant destinée à évacuer le liquide d'irrigation ; et un trajet d'écoulement pour relier la partie d'admission d'eau à la partie d'évacuation. Dans l'émetteur, le trajet d'écoulement comprend : une partie de réduction de débit contenant un premier diaphragme flexible disposé de manière à diviser l'intérieur de l'émetteur et l'intérieur du tube, la partie de réduction de débit réduisant le débit du liquide d'irrigation suite à la déformation du premier diaphragme en fonction de la pression du liquide d'irrigation dans le tube ; et un trajet d'écoulement d'évacuation qui relie la partie de réduction de débit à la partie d'évacuation. Le trajet d'écoulement d'évacuation comporte une partie de circulation à basse pression ayant un grand diamètre de trajet d'écoulement, et une partie de circulation à haute pression ayant un petit diamètre de trajet d'écoulement.
PCT/JP2018/010793 2017-03-31 2018-03-19 Émetteur et tube d'irrigation goutte à goutte Ceased WO2018180700A1 (fr)

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JP2017071232A JP6831738B2 (ja) 2017-03-31 2017-03-31 エミッタおよび点滴灌漑用チューブ
JP2017-071232 2017-03-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024249020A1 (fr) * 2023-05-26 2024-12-05 The Toro Company Émetteur d'irrigation

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010046094A (ja) * 1997-10-14 2010-03-04 Hydro Plan Engineering Ltd エミッターユニット
US20120305676A1 (en) * 2010-02-18 2012-12-06 Netafim, Ltd. Drip Irrigation Emitter
JP2016154525A (ja) * 2015-02-25 2016-09-01 株式会社エンプラス エミッタおよび点滴灌漑用チューブ
JP2017042106A (ja) * 2015-08-27 2017-03-02 株式会社エンプラス エミッタおよび点滴灌漑用チューブ

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010046094A (ja) * 1997-10-14 2010-03-04 Hydro Plan Engineering Ltd エミッターユニット
US20120305676A1 (en) * 2010-02-18 2012-12-06 Netafim, Ltd. Drip Irrigation Emitter
JP2016154525A (ja) * 2015-02-25 2016-09-01 株式会社エンプラス エミッタおよび点滴灌漑用チューブ
JP2017042106A (ja) * 2015-08-27 2017-03-02 株式会社エンプラス エミッタおよび点滴灌漑用チューブ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024249020A1 (fr) * 2023-05-26 2024-12-05 The Toro Company Émetteur d'irrigation

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