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WO2019078180A1 - Émetteur et tube d'irrigation par goutte à goutte - Google Patents

Émetteur et tube d'irrigation par goutte à goutte Download PDF

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Publication number
WO2019078180A1
WO2019078180A1 PCT/JP2018/038402 JP2018038402W WO2019078180A1 WO 2019078180 A1 WO2019078180 A1 WO 2019078180A1 JP 2018038402 W JP2018038402 W JP 2018038402W WO 2019078180 A1 WO2019078180 A1 WO 2019078180A1
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WO
WIPO (PCT)
Prior art keywords
emitter
tube
valve seat
irrigation liquid
diaphragm
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/JP2018/038402
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English (en)
Japanese (ja)
Inventor
高橋　淳
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Enplas Corp filed Critical Enplas Corp
Publication of WO2019078180A1 publication Critical patent/WO2019078180A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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 having the emitter.
  • the drip irrigation method is known as one of the plant cultivation methods.
  • the drip irrigation method is a method of disposing a drip irrigation tube on or in the soil where plants are planted, and dripping irrigation fluid such as water or liquid fertilizer from the drip irrigation tube onto the soil.
  • irrigation fluid such as water or liquid fertilizer
  • the drip irrigation tube generally includes a tube having a plurality of through holes through which the irrigation liquid is discharged, and a plurality of emitters (also referred to as “drippers") for discharging the irrigation liquid from the respective through holes.
  • a plurality of emitters also referred to as "drippers”
  • the emitter described in Patent Document 1 comprises a first member having a water intake for taking in irrigation liquid, a second member having a discharge outlet for discharging irrigation liquid, a first member and a first member, And a membrane member disposed between the two members.
  • the emitter is configured by superposing the first member, the membrane member and the second member in this order.
  • the emitter is bonded to the inner wall of the tube.
  • the irrigation liquid in the tube is continuously discharged outside the tube for a certain period of time.
  • the drip irrigation tube is disposed at a position where the elevation difference is, the irrigation liquid flows from the high position to the low position after the liquid transfer is stopped. Therefore, the amount of discharge of the irrigation liquid from the emitter at the lower position is higher than that of the discharge of the irrigation liquid from the emitter at the higher position. Therefore, the inside of the tube at the high position is likely to be negatively pressurized, and a fluid such as air or water containing fine soil may flow from the outside of the tube into the flow path of the emitter disposed at the high position.
  • the backflow phenomenon of the fluid hereinafter, also referred to as “siphon phenomenon” caused by the negative pressure in the tube, the inside of the emitter may be contaminated or clogged.
  • An object of the present invention is to provide an emitter and a drip irrigation tube capable of suppressing the occurrence of a siphon phenomenon and appropriately discharging the irrigation fluid even if the pressure of the irrigation fluid in the tube is low. .
  • the emitter concerning the present invention has the 1st field and the 2nd field which are in the relation of the front and back, and is connecting the inside wall of the tube which distributes the liquid for irrigation, and the inside and outside of the tube
  • An emitter for quantitatively discharging the irrigation liquid in the tube from the outlet to the outside of the tube when the nozzle is joined to a position corresponding to the outlet, and the emitter is disposed on the first surface
  • the water intake unit for taking in the irrigation liquid, the discharge unit disposed on the second surface and discharging the irrigation liquid, the water intake unit and the discharge unit are connected, and the irrigation liquid is circulated.
  • a backflow suppression unit disposed in the middle of the flow passage for suppressing backflow of fluid from the discharge unit side to the water intake unit side, the backflow suppression unit including a valve With a seat and flexibility,
  • the valve seat is disposed on the first surface so as to be separated from the valve seat, and disposed with a gap between the diaphragm portion further separating from the valve seat when a negative pressure is generated in the tube, and the valve seat And a valve body having one end fixed to the diaphragm portion, and when the diaphragm portion moves in a direction away from the valve seat, a gap between the valve seat and the valve body is narrowed.
  • the tube for drip irrigation which concerns on this invention joins the tube which has a discharge outlet for discharging the liquid for irrigation, and the position corresponding to the said discharge outlet of the inner wall face of the said tube And an emitter according to the present invention.
  • the occurrence of the siphon phenomenon can be suppressed, and the irrigation fluid can be appropriately discharged even if the pressure of the irrigation fluid in the tube is low.
  • FIGS. 1A and 1B are diagrams showing the configuration of a drip irrigation tube according to an embodiment.
  • 2A and 2B are diagrams showing the configuration of an emitter according to an embodiment.
  • 3A to 3C show the configuration of the emitter body.
  • FIGS. 4A and 4B are diagrams showing the configuration of the first diaphragm
  • FIGS. 4C and 4D are diagrams showing the configuration of the second diaphragm.
  • 5A to 5C are schematic cross-sectional views for explaining the operation of the backflow suppressing portion of the emitter according to the embodiment.
  • 6A to 6C are schematic cross-sectional views for explaining the operation of the flow rate adjuster of the emitter according to the embodiment.
  • FIG. 7 is a view showing a configuration of a second diaphragm portion of an emitter according to a modification.
  • the drip irrigation tube will be described in detail based on a specific embodiment.
  • the drip irrigation tube is not limited to the embodiment.
  • FIGS. 1A and 1B are diagrams showing the configuration of a drip irrigation tube 100 according to an embodiment.
  • FIG. 1A is a cross-sectional view in the direction along the axis of drip irrigation tube 100 according to the present embodiment
  • FIG. 1B is a cross-sectional view in the direction perpendicular to the axis of drip irrigation tube 100.
  • the drip irrigation tube 100 has a tube 110 having a discharge port 112 for discharging the irrigation liquid, and an emitter 120 joined at a position corresponding to the discharge port 112 of the inner wall surface of the tube 110.
  • the tube 110 is a tube for flowing irrigation liquid.
  • the tube 110 is usually made of resin, and the material of the tube 110 is, for example, polyethylene such as linear low density polyethylene or high density polyethylene.
  • the radial size of the tube 110 and the shape of the tube 110 may be such that the emitter 120 can be disposed inside the tube 110.
  • the tube wall of the tube 110 is formed with a plurality of discharge ports 112 for discharging the irrigation liquid at predetermined intervals (for example, 200 mm to 500 mm) in the axial direction of the tube 110.
  • the diameter of the opening of the discharge port 112 may be, for example, 1.5 mm as long as the irrigation liquid can be discharged at a desired flow rate.
  • Emitters 120 are respectively bonded to positions corresponding to the discharge ports 112 on the inner wall surface of the tube 110.
  • FIGS. 2A and 2B are diagrams showing the configuration of the emitter 120 according to the present embodiment.
  • 2A is a plan view of the emitter 120
  • FIG. 2B is a cross-sectional view taken along the line AA of FIG. 2A.
  • the hatching of the first diaphragm portion 170 and the second diaphragm portion 180 is omitted.
  • the emitter 120 has a first surface 1201 and a second surface 1202 that are in front and back relationship with each other.
  • the first surface 1201 is a surface disposed on the irrigation liquid side
  • the second surface 1202 is disposed in contact with the tube 110.
  • the size and shape of the emitter 120 can be appropriately determined as long as the desired function can be exhibited.
  • the plan view shape of the emitter 120 is a substantially rectangular shape in which the four corners are R-chamfered, the length in the long side direction of the emitter 120 is 35 mm, and the length in the short side direction of the emitter 120 is 8 mm The height of the emitter 120 is 2.5 mm.
  • the emitter 120 includes an emitter body 130, a first diaphragm portion 170 and a second diaphragm portion 180, and the first diaphragm portion 170 and the second diaphragm portion 180.
  • the diaphragm portion 180 is joined to the emitter body 130.
  • 3A to 3C are diagrams showing the configuration of the emitter main body 130 according to the present embodiment.
  • 3A is a plan view of the emitter body 130
  • FIG. 3B is a bottom view of the emitter body 130
  • FIG. 3C is a cross-sectional view taken along the line AA of FIG. 3A.
  • the emitter body 130 is molded of a resin material.
  • the resin material include polyethylene such as linear low density polyethylene and high density polyethylene, polypropylene, silicone, and industrial materials having rubber elasticity.
  • industrial materials having such rubber elasticity include elastomers and rubbers.
  • the emitter main body 130 has a substantially rectangular shape in a plan view.
  • the shape of the second surface 1202 of the emitter body 130 is a convex curved surface along the inner wall surface of the tube 110.
  • recesses, grooves, protrusions and through holes are appropriately arranged.
  • the first recess 131, the first cylindrical portion 132, the second recess 133, the second cylindrical portion 134, the first groove 136, the second groove A groove 137, a third groove 138 and a fourth groove 139 are formed. Further, from the first surface 1201 to the second surface 1202, the slits 140, the first holes 141, the second holes 142, the third holes 143, the fourth holes 144, and the fifth holes 145 are further formed. ing.
  • the fifth groove 150, the first depressurizing channel portion 151, the sixth groove 152, the second depressurizing channel portion 153, the third depressurizing channel portion A seventh groove 154 and a third recess 156 are further formed.
  • the first recess 131 opens at the central portion of the first surface 1201 of the emitter body 130.
  • the first cylindrical portion 132 is disposed at the central portion of the bottom surface of the first recess 131.
  • the second concave portion 133 is opened on the first surface 1201 of the emitter main body 130 to the outside of the first concave portion 131 in the longitudinal direction of the emitter main body 130.
  • the second cylindrical portion 134 is disposed at the center of the bottom of the second recess 133.
  • the plan view shape of each of the first recess 131 and the second recess 133 is circular.
  • a second hole 142 is open on the top surface of the first cylindrical portion 132.
  • a fifth hole 145 is open on the top surface of the second cylindrical portion 134.
  • the first groove 136 is formed on the upper surface of the second cylindrical portion 134, and communicates the peripheral edge of the upper surface of the second cylindrical portion 134 with the fifth hole 145.
  • the depth of the first recess 131 (the distance from the first surface 1201 of the emitter body 130 to the bottom surface of the first recess 131) and the depth of the second recess 133 (the first surface 1201 of the emitter body 130 to the second The distances to the bottom surface of the recess 133 may be the same or different. In the present embodiment, the depths of the first recess 131 and the second recess 133 are the same.
  • the first cylindrical portion 132 protrudes from the bottom of the first recess 131, and the second cylindrical portion 134 protrudes from the bottom of the second recess 133.
  • the height of the first cylindrical portion 132 is less than the depth of the first recess 131.
  • the height of the second cylindrical portion 134 is less than the depth of the second recess 133.
  • the heights of the first cylindrical portion 132 and the second cylindrical portion 134 may be the same as or different from each other.
  • the first cylindrical portion 132 is higher than the height of the second cylindrical portion 134.
  • the upper surface of the first cylindrical portion 132 is a flat surface
  • the upper surface of the second cylindrical portion 134 is a slope (curved surface).
  • the shape of the opening of the second hole 142 opened at the center of the upper surface of the first cylindrical portion 132 is circular, and the opening of the second hole 142 is open at the center of the upper surface of the second cylindrical portion 134.
  • the shape of the opening of the hole 145 of 5 is also circular. That is, in the present embodiment, both the plan view shape of the first cylindrical portion 132 and the plan view shape of the second cylindrical portion 134 have an annular shape.
  • the first groove 136 is formed on the top surface of the second cylindrical portion 134.
  • the number of first grooves 136 is one, and the shape in plan view is a linear shape.
  • the first groove 136 has a constant depth from the top surface of the second cylindrical portion 134, and has a bottom surface parallel to the top surface.
  • the first hole 141 opens at the bottom of the first recess 131.
  • the second hole 142 is open at the central portion of the first cylindrical portion 132.
  • the third hole 143 and the fourth hole 144 are open at the bottom of the second recess 133.
  • the fifth hole 145 opens at the central portion of the second cylindrical portion 134.
  • the plan view shapes of the first hole 141, the second hole 142, the third hole 143, the fourth hole 144, and the fifth hole 145 are all circular.
  • the emitter body 130 also has a filter portion 147 including a second groove 137, a third groove 138 and a fourth groove 139, and a slit 140 disposed in the filter portion 147.
  • the filter portion 147 and the slit 140 are disposed outside the first recess 131 on the other side in the longitudinal direction of the emitter body 130.
  • the filter portion 147 is a fine asperity formed on the first surface 1201 of the emitter body 130.
  • the filter portion 147 has a U-shaped second groove 137 along the edge of the other end in the longitudinal direction of the emitter body 130, and the second groove 137 and the outside extending from the second groove 137. And a plurality of fourth grooves 139 extending inward from the second groove 137.
  • the fourth grooves 139 mainly extend independently along the lateral direction of the emitter body 130, and parts of the fourth grooves 139 communicate with each other.
  • the slit 140 is an elongated through hole that opens along the longitudinal direction of the emitter body 130 at one end in the lateral direction of the emitter body 130.
  • the slits 140 are opened at the bottom of the plurality of fourth grooves 139 in the filter portion 147 on the first surface 1201 of the emitter body 130.
  • a fifth groove 150 is formed in the second surface 1202 of the emitter body 130.
  • the fifth groove 150 extends along the longitudinal direction at one end in the lateral direction of the emitter body 130.
  • the first depressurization channel portion 151 extends along the longitudinal direction at one end in the lateral direction.
  • One end of the first depressurizing channel 151 communicates with one end of the fifth groove 150.
  • the sixth groove 152 extends along the short direction at the other longitudinal end of the emitter body 130.
  • the sixth groove 152 is provided at the other end of the first depressurizing channel portion 151, one end of the second depressurizing channel portion 153, and the third depressurizing flow in the longitudinal inner portion. It communicates with one end of the passage 154.
  • the second depressurization channel portion 153 extends along the longitudinal direction at the central portion in the lateral direction.
  • the third depressurization channel portion 154 extends along the longitudinal direction at the other end in the lateral direction.
  • the seventh groove 155 extends in the central portion of the second surface 1202 of the emitter body 130 along the longitudinal direction.
  • the third recess 156 is formed on the second surface 1202 of the emitter body 130 outside the fifth groove 150, the seventh groove 155, and the third depressurizing channel portion 154 in the longitudinal direction. .
  • Each of the first pressure reduction flow channel portion 151, the second pressure reduction flow channel portion 153, and the third pressure reduction flow channel portion 154 is a groove whose planar shape is a zigzag shape.
  • the zig-zag shape is, for example, a shape formed by alternately arranging convex portions in a substantially triangular prism shape from both side surfaces of the pressure reducing channel portion along the longitudinal direction.
  • the convex portion is disposed such that the tip end of the convex portion does not exceed the central axis between the side surfaces.
  • a slit 140 is opened.
  • a first hole 141 is open at the other end of the second pressure reduction flow channel portion 153.
  • a second hole 142 is opened, and at the other end of the seventh groove 155, a third hole 143 is opened.
  • a fourth hole 144 is open at the other end of the third depressurizing channel 154.
  • a fifth hole 145 opens at the inside of the bottom of the third recess 156.
  • the third recess 156 is disposed across the outer end of the second surface 1202 of the emitter body 130.
  • a second convex portion 157, a third convex portion 158, a fourth convex portion 159, and a fifth convex portion 160 are disposed.
  • the second convex portion 157 extends along the short side direction, and is disposed at a position overlapping the fifth hole 145 in the longitudinal direction.
  • the third convex portion 158 is disposed at a position on the extension of the second convex portion 157 in the short direction away from any of the side walls of the second convex portion 157 and the third concave portion 156.
  • the fourth convex portion 159 extends from the side wall of the third concave portion 156 along the short direction, and a gap between the third convex portion 158 and the side wall of the third concave portion 156 in the longitudinal direction. It is arranged in the position which overlaps with.
  • the fifth convex portion 160 extends along the extension of the fourth convex portion 159 in the lateral direction, and side walls of the second convex portion 157 and the third convex portion 158 in the longitudinal direction. And the gap between the
  • FIGS. 4A and 4B are diagrams showing the configuration of the first diaphragm portion 170
  • FIGS. 4C and 4D are diagrams showing the configuration of the second diaphragm portion 180.
  • FIG. 4A and 4B are diagrams showing the configuration of the first diaphragm portion 170
  • FIGS. 4C and 4D are diagrams showing the configuration of the second diaphragm portion 180.
  • FIG. 4A is a cross-sectional view of the first diaphragm portion 170 passing through the central axis
  • FIG. 4B is a bottom view of the first diaphragm portion 170
  • 4C is a cross-sectional view of the second diaphragm 180 passing through the central axis
  • FIG. 4D is a bottom view of the second diaphragm 180.
  • the first diaphragm portion 170 and the second diaphragm portion 180 are made of resin and have flexibility.
  • the resin material include polyethylene such as linear low density polyethylene and high density polyethylene, polypropylene, silicone, and industrial materials having rubber elasticity. Examples of industrial materials having such rubber elasticity include elastomers and rubbers.
  • the resin material of the first diaphragm portion 170 may be the same as or different from the resin material of the emitter body 130.
  • the resin material of the first diaphragm portion 170 may be the same as or different from the resin material of the second diaphragm portion 180.
  • the first diaphragm portion 170 extends in the normal direction of the first film portion 171 from the first film portion 171 having a circular shape in plan view and the peripheral portion of the first film portion 171. And a first peripheral wall portion 173.
  • the first peripheral wall portion 173 is not shown in FIG. 2B and FIGS. 5A to 5C and FIGS. 6A to 6C, which will be described later.
  • the first peripheral wall portion 173 is disposed inside the outer edge portion of the first film portion 171.
  • the diameter of the first film portion 171 is larger than the diameter of the first recess 131, and the diameter of the first peripheral wall portion 173 is the same as the diameter of the first recess 131.
  • the portion of the first film portion 171 outside the first peripheral wall portion 173 and the first peripheral wall portion 173 are disposed on the emitter body 130 so as to sandwich the corner of the opening of the first recess 131 Be done. Thereby, the first diaphragm portion 170 is reliably and easily positioned at a desired position. At this time, the first film portion 171 and the upper surface of the first cylindrical portion 132 are disposed with a gap.
  • the second diaphragm 180 has a second film 181 having a circular shape in a plan view, and a second peripheral wall 183 extending in the normal direction of the second film 181. doing.
  • the second peripheral wall portion 183 is not shown in FIG. 2B and FIGS. 5A to 5C and FIGS. 6A to 6C described later.
  • one end of the valve body 182 is fixed to the center of the second film portion 181 of the second diaphragm portion 180, and the second diaphragm portion 180 and the valve body 182 are integrally formed. There is.
  • the second peripheral wall portion 183 of the second diaphragm portion 180 is disposed inside the outer edge portion of the second film portion 181.
  • the diameter of the second film portion 181 is larger than the diameter of the second recess 133, and the outer diameter of the second peripheral wall 183 is the same as the diameter of the second recess 133.
  • the portion of the second film portion 181 outside the second peripheral wall portion 183 and the second peripheral wall portion 183 are disposed on the emitter main body 130 so as to sandwich the corner of the opening of the second recess portion 133. Be done. Thereby, the second diaphragm portion 180 is reliably and easily positioned at a desired position. At this time, the second film portion 181 and the upper surface of the second cylindrical portion 134 are disposed with a gap.
  • the valve body 182 one end of which is fixed to the second diaphragm portion 180, is a valve when the second membrane portion (the second diaphragm portion 180) is bent in a direction away from the second surface 1202. It consists of a valve body main part 182b which approaches the seat (wall surface 145w of the fifth hole) and suppresses backflow of fluid, and a valve body shaft part 182a connecting the second membrane part 181 and the valve body main body 182b. .
  • the valve body 182 is second from the end of the valve body main body 182 b on the side of the diaphragm portion 180 of the valve seat (the wall surface 145 w of the fifth hole), that is, the opening on the second cylindrical portion 134 side of the fifth hole 145. It is positioned so as to be located on the surface 1202 side.
  • the outer shape of the valve main body 182b in the present embodiment is substantially a truncated cone in which the diameter in the horizontal cross section of the valve main body 182b decreases toward the second diaphragm 180 (the second membrane 181). It is a state. Further, with the maximum diameter of the valve body 182b, a sufficient gap is formed between the valve body 182b and the valve seat (the wall surface of the fifth hole 145) when the second membrane portion 181 is not bent. When the second membrane portion is bent in the direction away from the second surface 1202, the gap between the valve body 182b and the valve seat (the wall surface of the fifth hole 145) may be sufficiently narrow. Just do it.
  • the diameter (maximum diameter) of the tip portion of the valve body 182 b can be, for example, 90% or more of the maximum diameter of the fifth hole 145, and may be larger than the maximum diameter of the fifth hole 145.
  • the height of the valve body 182b is not particularly limited, and in the present embodiment, the height of the fifth hole 145 (from the opening on the second cylindrical portion 134 side of the fifth hole 145 to the third hole And the distance to the opening on the side of the concave portion 156).
  • the central portion of the valve body main body 182b is a hollow having a substantially truncated cone shape, and the thickness of the outer peripheral wall of the valve body main body 182b is substantially uniform.
  • the shape of the valve body shaft portion 182a may be any shape that does not prevent the movement of the valve body main body 182b accompanying the operation of the second diaphragm portion 180.
  • the cross section of the valve body main body 182b in the horizontal direction is It is cylindrical with a diameter substantially the same as the minimum diameter.
  • the height of the valve stem portion 182a is made equal to the distance between the second film portion 181 and the second cylindrical portion 134.
  • the emitter 120 having the above-described structure is manufactured by manufacturing the emitter body 130, the first diaphragm portion 170, and the second diaphragm portion 180 (including the valve body 182), respectively, and joining them. can do. For example, by fitting the peripheral wall portion 173 of the first diaphragm portion 170 into the first recess 131 of the emitter main body 130 and fitting the peripheral wall portion 183 of the second diaphragm portion 180 into the second recess 133 of the emitter main body 130 Thus, an emitter 120 in which the emitter body 130, the first diaphragm portion 170, and the second diaphragm portion 180 are integrated is obtained.
  • the valve body 182 b of the valve body 182 is inserted into the fifth hole 145 at the same time as the peripheral wall portion 183 of the second diaphragm portion 180 is fitted.
  • the valve body 182b can be inserted from the opening of the fifth hole 145 on the second cylindrical portion 134 side.
  • the method of manufacturing the emitter 120 is not limited to this method.
  • the valve body 182 and the second diaphragm portion 180 are manufactured separately, and the valve body 182 is opened from the third recess 156 side opening of the fifth hole 145.
  • the valve body shaft portion 182a may be inserted, and the valve body 182 and the second diaphragm portion 180 may be integrated.
  • the first diaphragm portion 170 and the second diaphragm portion 180 fitted in the emitter body 130 are joined by welding or fusion of resin materials constituting them, or adhesion by an adhesive.
  • the emitter 120 has the second surface 1202 of the emitter body 130 joined to the inner wall surface of the tube 110.
  • a drip irrigation tube 100 as shown in FIG. 1A, B is produced.
  • the ejection port 112 may be formed in the tube 110 in advance before bonding of the emitter 120 or may be formed after bonding of the emitter 120.
  • the filter portion 147, the slit 140 and the fifth groove 150 become a water intake portion 200 for taking in the irrigation liquid flowing in the tube 110.
  • the third concave portion 156 of the emitter 120 is joined so as to communicate with the discharge port 112 of the tube 110, and becomes the discharge portion 500 for discharging the irrigation solution.
  • the water intake portion 200 and the discharge portion 500 are connected by a channel formed of a groove, a through hole, or the like provided in the emitter 120.
  • a backflow suppression unit 300 for suppressing the backflow of fluid from the discharge unit 500 side to the water intake unit 200 side is disposed.
  • the arrangement position of the backflow suppressing portion 300 is not particularly limited, and may be disposed at an end of the flow path, that is, in a region in communication with the discharge portion 500 or the water intake portion 200. It is also good.
  • the backflow suppressing portion 300 is disposed in a region in communication with the discharge portion 500.
  • a flow rate adjustment unit for adjusting the amount of irrigation liquid discharged from the discharge unit 500 of the emitter 120 according to the pressure of the irrigation liquid inside the tube 110 ( A first flow control unit 700 and a second flow control unit 800) are also provided.
  • the irrigation liquid supplied into the tube 110 is supplied to the fifth groove 150 through the grooves (second groove 137, third groove 138 and fourth groove 139) of the filter portion 147 and the slit 140. Be done.
  • the irrigation liquid can be, for example, water, liquid fertilizer, pesticide, or a mixture of two or more thereof. Since the suspended matter in the irrigation liquid can not enter the groove of the filter portion 147, the irrigation liquid from which the suspended matter is removed is supplied to the fifth groove 150 through the slit 140.
  • the irrigation liquid supplied to the fifth groove 150 is supplied to the branch flow channel while being decompressed through the first pressure reduction channel 151.
  • a part of the irrigation liquid supplied to the branch flow channel is supplied to a first flow rate adjustment unit 700 described later while being further depressurized through the second pressure reduction flow channel (sixth groove 152). .
  • it is supplied to the below-mentioned 2nd flow rate adjustment part 800 via a connecting channel (seventh slot 155).
  • the remainder of the irrigation liquid supplied to the branch flow channel (sixth groove 152) is supplied to the second flow rate adjustment unit 800 while being further depressurized through the third pressure reduction channel unit 154. .
  • the irrigation liquid supplied to the second flow rate adjustment unit 800 is supplied to the discharge unit 500 at a flow rate adjusted according to the fluid pressure of the irrigation liquid in the tube 110 and discharged from the discharge port 112.
  • the second flow rate adjusting unit 800 also serves as the above-described backflow suppressing unit 300.
  • the flow path including the water intake portion 200, the first pressure reduction flow path portion 151, the second pressure reduction flow path portion 153, the first flow rate adjustment portion 700, the second flow rate adjustment portion 800, and the discharge portion 500 It is called “1 flow path”. Further, a flow path including the water intake portion 200, the first pressure reduction flow path portion 151, the third pressure reduction flow path portion 154, the second flow rate adjustment portion 800, and the discharge portion 500 is also referred to as a "second flow path".
  • the backflow suppressing portion 300 of the emitter 120 includes the fifth hole 145, the second diaphragm portion 180, and the valve body 182.
  • the backflow suppression unit 300 is in communication with the discharge unit 500 (third concave portion 156). On the other hand, it is in communication with the below-mentioned 1st flow rate adjustment part via the 2nd crevice 133, the 3rd hole 143, and the 7th slot 155. Further, it is also in communication with the flow path (the third pressure reduction flow path 154) via the second recess 133 and the fourth hole 144.
  • valve body 182 b of the valve body 182 is disposed in the fifth hole 145, and the wall surface 145 w of the fifth hole 145 (hereinafter simply referred to as “valve seat 145 w” Also functions as a valve seat.
  • the wall surface 145 w of the fifth hole may be a surface located around the fifth hole 145, and the opening on the third concave portion 156 side may be the second cylindrical portion 134 side. It may be a cylindrical surface having a uniform diameter over the opening, or may be a tapered surface whose diameter decreases from the opening on the third concave portion 156 side to the opening on the second cylindrical portion 134 side. .
  • valve seat 145 w is a tapered surface whose diameter decreases from the opening on the third concave portion 156 side toward the opening on the second cylindrical portion 134 side. Further, the second diaphragm portion 180 is disposed apart from the valve seat 145w in a non-loaded state, and bends away from the valve seat 145w when a negative pressure is generated in the tube 110.
  • valve body 182b has a gap between the valve body 182b and the valve seat 145w when the second diaphragm 180 (the second film 181) is not bent. It is arranged as.
  • the operation of the backflow suppression unit 300 will be described.
  • 5A to 5C show a partial schematic cross-sectional view of the backflow suppressor 300 of the emitter 120.
  • the second film portion 181 does not bend or bends to the second surface side (in FIG. 5A, the second film portion 181 is not bent) Show). At this time, a sufficient gap is generated between the valve body 182b and the valve seat 145w, and the irrigation liquid flows from the water intake 200 side toward the discharge part 500 through the gap.
  • the second film portion 181 is flat Or bend to the second side 1202.
  • the contact state (or very narrow gap) of the valve body 182b and the valve seat 145w is eliminated, and the irrigation liquid can flow from the water intake portion 200 toward the discharge portion 500. It becomes.
  • the first flow rate adjustment unit 700 of the present embodiment is configured of a first recess 131, a first cylindrical portion 132, a first hole 141, a second hole 142, and a first diaphragm portion 170.
  • the first flow rate adjusting unit 700 is in communication with the second pressure reducing flow passage 153 via the first hole 141, and via the second hole 142, the seventh groove 155 and the third hole 143.
  • the second flow control unit 800 communicates with the second flow control unit 800.
  • the upper surface of the first cylindrical portion 132 functions as a first flow rate adjustment valve seat 132s on which the first film portion 171 of the first diaphragm portion 170 is seated.
  • the first diaphragm portion 170 is disposed apart from the first flow control valve seat 132s in a state not receiving a load, and when the pressure of the irrigation liquid in the tube 110 is received, the first diaphragm portion 170 Approach the valve seat 132s.
  • the second flow rate adjusting unit 800 includes the second recess 133, the second cylindrical portion 134, the third hole 143, the fourth hole 144, the fifth hole 145, the first groove 136, and the first It comprises the two diaphragm parts 180.
  • the second flow rate adjusting unit 800 is in communication with the third pressure reducing flow passage 154 via the fourth hole 144, and via the third hole 143, the seventh groove 155 and the second hole 142. It communicates with the first flow rate adjustment unit 700. On the other hand, it is in communication with the later-described discharge unit 500 through the fifth hole 145.
  • the upper surface of the second cylindrical portion 134 functions as a second flow rate adjustment valve seat 134s on which the second film portion 181 of the second diaphragm portion 180 is seated.
  • the second diaphragm portion 180 is disposed apart from the second flow control valve seat 134s in a non-loaded state, and receives the pressure of the irrigation liquid in the tube 110.
  • Approach 134s are possible.
  • FIG. 6A to 6C are partial enlarged cross-sectional views for describing control of the flow rate (discharge) of the irrigation liquid by the first flow rate adjustment unit 700 and the second flow rate adjustment unit 800.
  • FIG. 6A is a cross-sectional view schematically showing the state of the first flow rate adjusting unit 700 and the second flow rate adjusting unit 800 under the non-pressure condition and the extremely low pressure condition of the emitter 120
  • FIG. 6C is a cross-sectional view schematically showing the state of the first flow rate adjusting unit 700 and the second flow rate adjusting unit 800 under the low pressure condition of FIG.
  • FIG. 7 is a cross-sectional view schematically showing the state of 700 and a second flow rate adjustment unit 800.
  • the hydraulic pressure of the irrigation liquid is an extremely low pressure (for example, about 0.005 MPa) (extreme low pressure condition)
  • the irrigation liquid flows in the tube 110 and the emitter 120.
  • the hydraulic pressure (external hydraulic pressure) of the irrigation liquid in the tube 110 and outside the emitter 120 and the hydraulic pressure (internal of the irrigation liquid in the first recess 131) A slight difference occurs with the fluid pressure).
  • the internal fluid pressure in the first flow rate adjustment unit 700 becomes lower than the external fluid pressure due to the pressure loss in the first pressure reduction flow passage portion 151 and the second pressure reduction flow passage portion 153.
  • the internal fluid pressure in the second flow rate adjustment unit 800 is greater than the external fluid pressure due to the pressure loss in the first pressure reduction flow passage portion 151, the third pressure reduction flow passage portion 154, and the first flow rate adjustment portion 700. Also lower.
  • the second diaphragm portion 180 is also largely bent by the differential pressure between the external hydraulic pressure and the internal hydraulic pressure, and the two diaphragm portions 180 and the second valve seat 134s for flow rate adjustment Will abut.
  • the fifth hole 145 communicates with the second circular recess 133 via the first groove 136. Therefore, a predetermined amount of irrigation liquid flows into the fifth hole 145 via the first groove 136, and the irrigation liquid is discharged from the discharge port 112. At this time, the flow rate of the irrigation liquid discharged from the discharge port 112 is smaller than that under the low pressure condition.
  • the backflow suppression unit 300 is provided in the middle of the flow path between the water intake unit 200 and the discharge unit 300.
  • the second diaphragm portion 180 (valve seat (145W)) moves in a direction away from the second surface.
  • the valve body 182 one end of which is fixed to the second diaphragm portion 180, moves so that the gap between the valve seat 145w and the valve body 182 becomes narrow. Therefore, the backflow (siphon phenomenon) of the fluid from the discharge part 300 side to the water intake part 200 side is suppressed. Therefore, according to the drip irrigation tube 100 having the emitter 120 according to the present embodiment, the occurrence of clogging of the flow path due to the siphon phenomenon is suppressed even in a place having a height difference.
  • the second diaphragm portion 180 becomes flat, or the second diaphragm portion 180 approaches the valve seat 145w. Therefore, in these states, a constant gap is generated between the valve seat 145w and the valve body 182, and the irrigation liquid can be properly discharged even if the pressure of the irrigation liquid in the tube 110 is low. .
  • valve body main body 182b of the valve body 182 is substantially frusto-conical
  • shape of the valve body main body 182b is the direction in which the second diaphragm 180 separates from the valve seat 145w.
  • the gap between the valve seat 145 w and the valve body 182 b may be narrow when moving to the side, for example, as shown in FIG. 7 (cross-sectional view of the second diaphragm 180 passing through the central axis) It may be present, or may be polygonal, spherical or the like.
  • the 2nd diaphragm part 180 of the 2nd flow rate adjustment part 800 served as the diaphragm part of the backflow prevention part 300, the backflow prevention part 300 and the 2nd flow rate adjustment part 800 separately It may be arranged.
  • positioned these may not necessarily be required.
  • the emitter of the present invention it is possible to suppress the occurrence of clogging due to the backflow of the fluid outside the tube to the flow path even at a place where there is a difference in elevation. Therefore, further development of drip irrigation is expected.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental Sciences (AREA)
  • Fluid-Driven Valves (AREA)

Abstract

La présente invention aborde le problème de l'obtention d'un émetteur permettant d'empêcher l'apparition du phénomène de siphon, et d'évacuer un liquide d'irrigation d'une manière satisfaisante même si la pression du liquide d'irrigation dans un tube est faible. La solution au problème précité, selon l'invention, porte sur un émetteur ayant une première surface et une seconde surface qui sont dans une relation avers-revers l'une avec l'autre. L'émetteur comprend : une entrée permettant d'introduire un liquide d'irrigation, l'entrée étant disposée sur la première surface ; une unité d'évacuation permettant d'évacuer le liquide d'irrigation, l'unité d'évacuation étant disposée sur la seconde surface ; un canal reliant l'entrée et l'unité d'évacuation, le canal canalisant le liquide d'irrigation ; et une unité de suppression de refoulement permettant de supprimer le refoulement d'un fluide depuis le côté unité d'évacuation jusqu'au côté entrée, l'unité de suppression de refoulement étant disposée à mi-chemin le long du canal. L'unité de suppression de refoulement comprend un siège de soupape, une partie diaphragme qui s'éloigne davantage du siège de soupape lorsqu'une pression négative est produite dans le tube, et un corps de soupape dont une extrémité est fixée à la partie diaphragme. Lorsque la partie diaphragme s'éloigne du siège de soupape, l'espace entre le siège de soupape et le corps de soupape rétrécit.
PCT/JP2018/038402 2017-10-18 2018-10-16 Émetteur et tube d'irrigation par goutte à goutte Ceased WO2019078180A1 (fr)

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JP2017-201964 2017-10-18
JP2017201964A JP2019071855A (ja) 2017-10-18 2017-10-18 エミッタおよび点滴灌漑用チューブ

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021039624A1 (fr) * 2019-08-29 2021-03-04 株式会社エンプラス Goutteur et tuyau d'irrigation goutte à goutte

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5931389A (en) * 1997-02-25 1999-08-03 Plasticos Mondragon, S.A. Self-compensating dropper for underground irrigation
US20060163388A1 (en) * 2002-10-02 2006-07-27 Mari Juan D Self-compensating drip irrigation emitter, comprising a unidirectional flow device
WO2017057034A1 (fr) * 2015-10-01 2017-04-06 株式会社エンプラス Émetteur et tube d'irrigation goutte à goutte
WO2017098858A1 (fr) * 2015-12-09 2017-06-15 株式会社エンプラス Émetteur et tube d'irrigation goutte-à-goutte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5931389A (en) * 1997-02-25 1999-08-03 Plasticos Mondragon, S.A. Self-compensating dropper for underground irrigation
US20060163388A1 (en) * 2002-10-02 2006-07-27 Mari Juan D Self-compensating drip irrigation emitter, comprising a unidirectional flow device
WO2017057034A1 (fr) * 2015-10-01 2017-04-06 株式会社エンプラス Émetteur et tube d'irrigation goutte à goutte
WO2017098858A1 (fr) * 2015-12-09 2017-06-15 株式会社エンプラス Émetteur et tube d'irrigation goutte-à-goutte

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021039624A1 (fr) * 2019-08-29 2021-03-04 株式会社エンプラス Goutteur et tuyau d'irrigation goutte à goutte

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