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WO2018190084A1 - 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
WO2018190084A1
WO2018190084A1 PCT/JP2018/010947 JP2018010947W WO2018190084A1 WO 2018190084 A1 WO2018190084 A1 WO 2018190084A1 JP 2018010947 W JP2018010947 W JP 2018010947W WO 2018190084 A1 WO2018190084 A1 WO 2018190084A1
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WO
WIPO (PCT)
Prior art keywords
flow path
emitter
tube
irrigation liquid
backflow prevention
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/JP2018/010947
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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
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 WO2018190084A1 publication Critical patent/WO2018190084A1/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.
  • Drip irrigation method is known as one of the plant cultivation methods.
  • the drip irrigation method is a method in which a drip irrigation tube is arranged on or in the soil where 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 is dropped from the drip irrigation tube to the soil.
  • One advantage of the drip irrigation method is that the consumption of irrigation liquid can be minimized.
  • a drip irrigation tube is joined to a tube having a plurality of through holes and a plurality of emitters (“drippers”) that are bonded to the inner wall surface of the tube and quantitatively discharge irrigation liquid from each through hole.
  • the irrigation liquid is sent into the tube by, for example, a pump, and discharged from the through hole through the emitter.
  • the emitter described in Patent Document 1 includes a first member, a second member, and a film member disposed between the first member and the second member.
  • the first member has a water intake for taking in the irrigation liquid into the emitter, and a wall portion arranged to surround the water intake inside the first member.
  • the second member has a discharge port for discharging the irrigation liquid out of the emitter.
  • the water intake is blocked by the membrane member coming into contact with the wall portion.
  • the membrane member closing the intake port is pressed by the irrigation liquid and deformed.
  • the irrigation liquid flows into the emitter through a gap formed between the membrane member and the wall due to the deformation of the membrane member.
  • the irrigation liquid in the tube is continuously discharged for a certain period of time.
  • the amount of irrigation liquid discharged from lower emitters is higher than the amount of irrigation liquid discharged from higher emitters .
  • the pressure in the tube at a high position becomes a negative pressure.
  • a fluid such as air or water containing fine soil from the outside of the tube may flow backward into the flow path of the emitter.
  • the back flow phenomenon of the fluid that may be caused by the negative pressure in the tube (hereinafter also referred to as “siphon phenomenon”) may contaminate the inside of the emitter or cause clogging.
  • the membrane member described in Patent Document 1 also functions as a backflow prevention valve that prevents the fluid from flowing back from the discharge port to the flow path together with the first member.
  • the backflow prevention valve of the emitter is composed of three members (first member, second member and membrane member), an assembly error may occur.
  • An object of the present invention is to provide an emitter and a drip irrigation tube that can suppress the occurrence of siphon phenomenon and have a backflow prevention valve composed of one member.
  • an emitter has a first surface and a second surface that are in a relationship of front and back, and communicates the inside and outside of the tube on the inner wall surface of the tube through which the irrigation liquid flows. And an emitter for quantitatively discharging the irrigation liquid in the tube from the discharge port to the outside of the tube, and disposed on the first surface.
  • a flow path and the flow path that is disposed in the flow path opens the flow path for the irrigation liquid flowing toward the discharge section, and flows back to the flow path from the discharge section.
  • a backflow prevention valve Close the flow path
  • the backflow prevention valve including a fixed end fixed to the inner wall of the flow path, and a free end located on the opposite side of the fixed end.
  • a valve body and a convex portion protruding toward the downstream of the flow path at the free end portion.
  • a drip irrigation tube according to the present invention is joined to a tube having a discharge port for discharging irrigation liquid and a position corresponding to the discharge port on the inner wall surface of the tube. And an emitter according to the present invention.
  • an emitter and a drip irrigation tube that have a backflow prevention valve composed of one member and can suppress the occurrence of a siphon phenomenon.
  • FIG. 1A and 1B are cross-sectional views showing an example of the configuration of a drip irrigation tube according to Embodiment 1.
  • FIG. 2A to 2C are diagrams showing the configuration of the emitter or emitter body according to Embodiment 1.
  • FIG. 3 is a cross-sectional view showing the configuration of the emitter according to the first embodiment.
  • 4A to 4C are schematic cross-sectional views for explaining the operation of the flow rate reducing unit and the backflow prevention valve.
  • 5A and 5B are bottom views for illustrating the configuration of a part of the emitter according to Embodiment 2 and for explaining the operation of the check valve.
  • FIG. 1A is a cross-sectional view of the drip irrigation tube 100 in the axial direction
  • FIG. 1B is a cross-sectional view of the drip irrigation tube 100 in a direction perpendicular to the axial direction.
  • the drip irrigation tube 100 includes a tube 110 and an emitter 120.
  • the tube 110 is a tube for flowing irrigation liquid.
  • the irrigation liquid is sent into the tube 110 using a pump, for example.
  • a plurality of discharge ports 112 for discharging the irrigation liquid to the outside of the tube 110 at a predetermined interval (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 pass through. In the present embodiment, the diameter of the opening of the discharge port 112 is 1.5 mm.
  • Emitters 120 are respectively joined to the 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 material of the tube 110 is not particularly limited. In the present embodiment, the material of the tube 110 is polyethylene.
  • irrigation liquid examples include water, liquid fertilizer, agricultural chemicals, and a mixture thereof.
  • FIGS. 2A to 2C are diagrams showing the configuration of the emitter 120 or the emitter body 121 according to the first embodiment.
  • 2A is a plan view of the emitter body 121
  • FIG. 2B is a plan view of the emitter 120
  • FIG. 2C is a bottom view of the emitter 120.
  • FIG. 3 is a cross-sectional view showing the configuration of the emitter 120 according to the present embodiment.
  • FIG. 3 is a cross-sectional view taken along line AA shown in FIG. 2B.
  • 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 of the emitter 120 joined to the inner wall surface of the tube 110 in the cross section perpendicular to the axial direction of the tube 110 is such that the inner wall surface of the tube 110 is aligned with the inner wall surface of the tube 110. It is a substantially circular arc shape convex toward.
  • the shape of the emitter 120 in plan view is a substantially rectangular shape with four corners rounded off.
  • 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 includes at least an emitter body 121, a film 122, and a cover 123. Details of the function of the emitter 120 will be described later.
  • the emitter body 121 (emitter 120) has a first surface 1211 and a second surface 1212 that are in a front-back relationship.
  • the first surface 1211 is located on the front surface side (irrigation liquid side) of the emitter 120
  • the second surface 1212 is located on the rear surface side (tube 110 side) of the emitter 120.
  • the emitter body 121 is appropriately formed with recesses, grooves, protrusions, and through-holes within a range where the effects of the present embodiment can be obtained.
  • at least a water intake recess 153, a flow rate reduction recess 161, and a backflow prevention recess 171 are formed on the first surface 1211 of the emitter body 121 (FIG. 2A). reference).
  • at least a first connection groove 131, a first decompression groove 132, a second connection groove 133, a second decompression groove 134, and a discharge recess 181 are formed on the second surface 1212 of the emitter body 121 (see FIG. 2C).
  • the emitter body 121 is made of a material having moderate flexibility.
  • Examples of the material of the emitter body 121 include resin and rubber.
  • Examples of the resin include polyethylene and silicone.
  • the flexibility of the emitter body 121 can be adjusted by using a resin material having elasticity.
  • Examples of the method for adjusting the flexibility of the emitter body 121 include selection of a resin having elasticity, adjustment of a mixing ratio of a resin material having elasticity with respect to a hard resin material, and the like.
  • the emitter body 121 can be manufactured by injection molding, for example.
  • the film 122 is bonded to a part of the first surface 1211 of the emitter body 121.
  • the film 122 is disposed on the emitter body 121 so as to close the opening of the flow rate reducing recess 161. That is, the film 122 is joined to the emitter main body 121 at a portion outside the opening.
  • the film 122 has flexibility and is deformed by the pressure of the irrigation liquid.
  • the shape and size of the film 122 can be appropriately set according to the shape and size of the emitter main body 121 and the shape and size of the opening of the flow rate reducing recess 161 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 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 and silicone.
  • 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 film 122 can be manufactured by injection molding, for example.
  • the emitter body 121 and the film 122 may be integrated or separate.
  • the emitter main body 121 and the film 122 may be integrally formed via a hinge part.
  • the film 122 may be rotated about the hinge portion, and the film 122 may be joined to the first surface 1211 of the emitter body 121.
  • the joining method of the emitter body 121 and the film 122 is not particularly limited. Examples of the joining method include welding of a resin material, adhesion with an adhesive, and the like.
  • the hinge portion may be cut after the emitter body 121 and the film 122 are joined.
  • the cover 123 is joined to a part of the first surface 1211 of the emitter 121 main body.
  • the cover 123 is disposed on the emitter body 121 so as to close the opening of the backflow preventing recess 171. That is, the cover 123 is joined to the emitter body 121 at a portion outside the opening.
  • the shape and size of the cover 123 can be appropriately set according to the shape and size of the emitter body 121, the shape and size of the opening of the backflow prevention recess 171 formed in the emitter body 121, and the like.
  • the cover 123 may be formed of a flexible material or may be formed of a rigid material.
  • the material of the cover 123 include resin, rubber, and metal. Examples of the resin include polyethylene and silicone.
  • the flexibility of the cover 123 is the same as the method for adjusting the flexibility of the emitter body 121.
  • the cover 123 can be manufactured by injection molding, for example.
  • cover 123 is formed of a material having rigidity.
  • the “material having rigidity” means a material having a rigidity that prevents a member formed by the material from being deformed by the pressure of the irrigation liquid.
  • the emitter body 121 and the cover 123 may be integrated or separate.
  • An example of a method for joining the emitter body 121 and the cover 123 is the same as an example of a method for joining the emitter body 121 and the film 122.
  • the film 122 and the cover 123 may be integrated or separate. When the film 122 and the cover 123 are integral, the film 122 and the cover 123 are both flexible. In the present embodiment, the film 122 and the cover 123 are separate bodies. From the viewpoint of imparting rigidity to the cover 123, the film 122 and the cover 123 are preferably separate.
  • the drip irrigation tube 100 is manufactured by joining the back surface 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 bonding method include welding of a resin material constituting the emitter 120 or the tube 110, bonding with an adhesive, and the like.
  • the discharge port 112 is formed after the tube 110 and the emitter 120 are joined, but may be formed before joining.
  • the emitter 120 includes a water intake unit 150, a first connection channel 141, a first pressure reduction channel 142, a second connection channel 143, a second pressure reduction channel 144, a flow rate reduction unit 160, a backflow prevention valve 170, and a discharge unit 180.
  • the water intake unit 150 and the flow rate reduction unit 160 are disposed on the surface of the emitter 120 (the first surface 1211 of the emitter body 121). Further, the first connection channel 141, the first decompression channel 142, the second connection channel 143, the second decompression channel 144, and the discharge unit 180 are provided on the back surface of the emitter 120 (the second surface 1212 of the emitter body 121). Has been placed.
  • the backflow prevention valve 170 is disposed in a through hole that opens to the first surface 1211 and the second surface 1212.
  • the first connection channel 141, the first decompression channel 142, the second connection channel 143, the second decompression channel 144, and the discharge unit 180 are formed.
  • a flow path that connects the water intake unit 150 and the discharge unit 180 is also formed. The flow channel distributes the irrigation liquid from the water intake unit 150 to the discharge unit 180.
  • the water intake unit 150 takes the irrigation liquid into the emitter 120.
  • the water intake 150 is disposed in a region that is approximately half of the first surface 1211 of the emitter body 121 (see FIGS. 2A and 2B).
  • 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 emitter 120.
  • 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 screen ridges 155.
  • the water intake recess 153 is a recess formed in a region where the film 122 is not joined on the first surface 1211 of the emitter body 121.
  • the depth of the water intake recess 153 is not particularly limited, and is appropriately set according to 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 screen 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 screen ridges 155 are arranged on the bottom surface of the water intake recess 153.
  • the arrangement and number of the screen 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 screen ridges 155 are arranged such that the major axis direction of the screen ridges 155 is along the minor axis direction of the emitter 120. Further, the screen protrusion 155 is formed so that the width decreases from the first surface 1211 of the emitter body 121 toward the bottom surface of the water intake recess 153.
  • the space between the adjacent screen ridges 155 has a so-called wedge wire structure.
  • line parts 155 for screens will not be specifically limited if the above-mentioned function can be exhibited.
  • the space between the adjacent screen ridges 155 is configured to have a so-called wedge wire structure, so that 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 this long hole is partially covered with the plurality of screen ridges 155, the water intake through hole 152 is divided into a large number of through holes when viewed from the first surface 1211 side. appear.
  • the irrigation liquid that has flowed through the tube 110 is taken into the emitter main body 121 while the water intake side screen portion 151 prevents floating substances from entering the water intake recess 153.
  • the first connection flow path 141 (first connection groove 131) is disposed in the flow path, and includes the water intake section 150 (water intake through hole 152) and the first pressure reduction flow path 142 (first pressure reduction groove 132). Connecting.
  • the first connection channel 141 (first connection groove 131) is linearly arranged along the major axis direction of the emitter 120 at the outer edge portion of the second surface 1212 of the emitter body 121.
  • 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 decompression flow path 142 (first decompression groove 132) is disposed downstream of the first connection flow path 141 in the flow path, and is connected to the first connection flow path 141 (first connection groove 131) and the second connection flow.
  • the path 143 (second connection groove 133) is connected.
  • the first reduced pressure channel 142 reduces the pressure of the irrigation liquid introduced from the water intake unit 150 and guides it to the second connection channel 143.
  • the first decompression flow path 142 (first decompression groove 132) is linearly disposed along the major axis direction of the emitter 120 at the outer edge portion of the second surface 1212 of the emitter body 121.
  • the upstream end of the first decompression flow path 142 is connected to the first connection flow path 141, and the downstream end of the first decompression flow path 142 is connected to the upstream end of the second connection flow path 143. ing.
  • the shape of the first decompression groove 132 is not particularly limited as long as the above function can be exhibited.
  • the plan view shape of the first decompression groove 132 is a zigzag shape.
  • first triangular protrusions 1361 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 1361 is disposed so that the tip does not exceed the central axis of the first decompression groove 132 when viewed in plan.
  • the second connection channel 143 (second connection groove 133) is disposed downstream of the first decompression channel 142 in the channel, and the first decompression channel 142 (first decompression groove 132) and the second decompression channel
  • the flow path 144 (second decompression groove 134) is connected.
  • the second connection channel 143 is formed linearly along the minor axis direction of the emitter 120 at the outer edge of the second surface 1212 of the emitter body 121.
  • the second connection channel 143 is formed by the second connection groove 133 and the inner wall surface of the tube 110.
  • the irrigation liquid that has been taken in from the water intake unit 150, led to the first connection channel 141, and decompressed in the first decompression channel 142 is guided to the second decompression channel 144 through the second connection channel 143. It is burned.
  • the second decompression flow path 144 (second decompression groove 134) is disposed downstream of the second connection flow path 143 in the flow path, and includes a second connection groove 133 (second connection flow path 143) and a flow rate reduction unit. 160 is connected.
  • the second decompression flow path 144 reduces the pressure of the irrigation liquid flowing from the second connection flow path 143 and guides it to the flow rate reduction unit 160.
  • the second decompression flow path 144 (second decompression groove 134) is disposed along the major axis direction of the emitter 120 at the outer edge portion of the second surface 1212 of the emitter body 121.
  • 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 flow path 144 is connected to the first connection through hole 164 of the flow rate reducing unit 160. .
  • the shape of the second decompression groove 134 is not particularly limited as long as the above 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 1362 protruding from the inner surface are alternately arranged along the direction in which the irrigation liquid flows.
  • the second convex portion 1362 is arranged so that the tip does not exceed the central axis of the second decompression groove 134 when viewed in plan.
  • the flow rate reducing unit 160 is disposed downstream of the second decompression flow channel 144 and upstream of the backflow prevention valve 170 in the flow channel, and is disposed on the surface side of the emitter 120.
  • the flow rate reduction unit 160 sends the irrigation liquid to the backflow prevention valve 170 while reducing the flow rate of the irrigation liquid according to the deformation of the film 122 due to the pressure of the irrigation liquid in the tube 110.
  • the flow rate reducing portion 160 includes a flow rate reducing recess 161, a valve seat portion 162, a communication groove 163, a first connection through hole 164, a second connection through hole 165, and a diaphragm portion 166.
  • the flow rate reducing recess 161 is disposed on the first surface 1211 of the emitter body 121.
  • the plan view shape of the flow rate reducing recess 161 is not particularly limited, and is, for example, a substantially circular shape.
  • 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.
  • a first connection through hole 164 and a second connection through hole 165 are open on the inner surface of the flow rate reducing recess 161. In the present embodiment, the first connection through hole 164 and the second connection through hole 165 are open to the bottom surface of the flow rate reducing recess 161.
  • the valve seat 162 is arranged on the bottom surface of the flow rate reducing recess 161.
  • the valve seat portion 162 is disposed in a non-contact manner so as to face the diaphragm portion 166 so as to surround the opening portion of the second connection through hole 165.
  • the valve seat 162 is configured so that the diaphragm 166 can be in close contact when the pressure of the irrigation liquid flowing through the tube 110 exceeds a set value.
  • valve seat portion 162 is not particularly limited as long as the above-described function can be exhibited.
  • the valve seat portion 162 is a cylindrical convex portion.
  • the height of the end surface of the convex portion from the bottom surface of the flow rate reducing concave portion 161 decreases from the inside toward the outside.
  • the communication groove 163 communicates the inside of the flow rate reducing recess 161 with the second connection through hole 165 surrounded by the valve seat 162.
  • the communication groove 163 is disposed on a part of the surface of the valve seat portion 162 to which the diaphragm portion 166 can come into close contact.
  • the first connection through-hole 164 communicates with the upstream side of the flow path at the flow rate reducing portion 160.
  • the first connection through hole 164 communicates with the second reduced pressure channel 144 (second reduced pressure groove 134).
  • the first connection through hole 164 is disposed on the inner surface of the flow rate reducing recess 161.
  • the first connection through-hole 164 is disposed, for example, on the bottom or surface of the flow rate reducing recess 161.
  • the first connection through-hole 164 is disposed in a region where the valve seat 162 is not disposed on the bottom surface of the flow rate reducing recess 161.
  • the second connection through-hole 165 communicates with the downstream side of the flow path in the flow rate reduction unit 160.
  • the second connection through-hole 165 communicates with the backflow prevention valve 170.
  • the second connection through-hole 165 is disposed on the inner surface of the flow rate reducing recess 161.
  • the second connection through hole 165 is disposed on the bottom surface or the side surface of the flow rate reducing recess 161, for example.
  • the second connection through-hole 165 is disposed at the central portion of the bottom surface of the flow rate reducing recess 161.
  • first connection through holes 164 and the second connection through holes 165 are not limited to the form of the present embodiment.
  • a second connection through hole 165 may be disposed outside the valve seat portion 162.
  • the first connection through hole 164 may be disposed so as to be surrounded by the valve seat portion 162.
  • the diaphragm portion 166 is a part of the film 122.
  • the diaphragm portion 166 is disposed so as to block communication between the inside of the flow rate reducing recess 161 and the inside of the tube 110 and close the opening of the flow rate reducing recess 161.
  • the diaphragm portion 166 has flexibility and deforms so as to contact the valve seat portion 162 in accordance with the pressure of the irrigation liquid in the tube 110. For example, the diaphragm portion 166 is distorted to the flow rate reducing recess 161 side when the pressure of the irrigation liquid flowing in the tube 110 exceeds a set value.
  • the diaphragm portion 166 deforms toward the valve seat portion 162 as the pressure of the irrigation liquid increases, and eventually comes into contact with the valve seat portion 162. Even when the diaphragm portion 166 is in close contact with the valve seat portion 162, the diaphragm portion 166 does not block the first connection through hole 164, the second connection through hole 165, and the communication groove 163. The irrigation liquid from the connection through hole 164 can be sent to the backflow prevention valve 170 through the communication groove 163 and the second connection through hole 165.
  • the backflow prevention valve 170 is disposed downstream of the flow rate adjustment unit 160 and upstream of the discharge unit 180 in the flow path.
  • the backflow prevention valve 170 opens the flow path for the irrigation liquid flowing toward the discharge section 180 and closes the flow path for the fluid flowing back from the discharge section 180 to the flow path.
  • the backflow prevention valve 170 sends the irrigation liquid to the discharge unit 180, and the fluid flowing back from the discharge unit 180 to the flow path when the liquid supply is stopped flows to the upstream of the backflow prevention valve 170. Stop.
  • the backflow prevention valve 170 is disposed on the downstream side of the flow path. That is, the backflow prevention valve 170 is preferably disposed downstream of the component for adjusting the discharge amount, and more preferably disposed at a position directly communicating with the discharge unit 180. In the present embodiment, since the backflow prevention valve 170 is disposed downstream of the flow rate adjustment unit 160, the fluid that has flowed back into the flow path does not flow into the flow rate adjustment unit 160.
  • the backflow prevention valve 170 includes a backflow prevention recess 171, a valve body 172, a fixing portion 174, and a third connection through hole 175.
  • the backflow preventing recess 171 is disposed on the first surface 1211 of the emitter body 121.
  • the shape in plan view of the backflow preventing recess 171 is not particularly limited.
  • the backflow preventing recess 171 has a substantially circular circular portion and a protruding portion protruding from the circular portion in a plan view.
  • the depth of the backflow preventing recess 171 is not particularly limited.
  • the depth of the circular portion and the depth of the protruding portion may be the same or different from each other. In the present embodiment, the depth of the circular portion and the depth of the protruding portion are the same.
  • a part of the bottom of the backflow prevention recess 171 is constituted by a valve body 172 and a fixing part 174.
  • the bottom of the circular portion of the backflow preventing recess 171 is constituted by a valve body 172 and a fixing portion 174.
  • a third connection through-hole 175 is open on the inner surface of the backflow prevention recess 171.
  • the third connection through hole 175 is disposed on the bottom surface of the protruding portion of the backflow prevention recess 171.
  • the valve element 172 is deformed downstream in accordance with the pressure of the irrigation liquid flowing toward the discharge unit 180. On the other hand, the valve body 172 does not deform toward the upstream depending on the pressure of the fluid flowing backward from the discharge part 180 to the flow path.
  • the valve body 172 is arrange
  • the upstream and downstream sides of the valve body 172 in the flow path communicate with each other through a gap formed between the valve body 172 and the fixing portion 174 in the open state of the flow path.
  • valve body 172 is not particularly limited as long as the flow path can be opened and closed according to the pressure of the irrigation liquid in the flow path.
  • valve body 172 is arranged in a portion of the flow path that extends along the opposing direction of first surface 1211 and second surface 1212. That is, the valve body 172 is disposed in a through hole that opens to the first surface 1211 and the second surface 1212.
  • the number, shape, and size of the valve body 172 are not particularly limited as long as the above functions can be exhibited.
  • the planar view shape of the valve body 172 is a fan shape.
  • the number of valve bodies 172 is two.
  • the two valve bodies 172 are arranged so as to be in contact with each other at a portion corresponding to the fan-shaped apex.
  • the valve body 172 includes a fixed end portion fixed to the inner wall of the flow path and a free end portion located on the opposite side of the fixed end portion.
  • the fixed end is fixed to the side surface of the flow path (the inner wall surface of the flow path groove).
  • the fixed end portion is an arc-shaped portion in the fan-shaped valve body 172.
  • the free end is the tip (top) of the fan-shaped valve body 172. In the state where the flow path is closed, the upstream edge of the valve body 172 is in contact with the downstream edge of the fixing portion 174.
  • a convex portion 173 that protrudes downstream of the flow path is formed at the free end portion of the valve body 172.
  • the convex portion 173 is formed on each of the free end portions of the two valve bodies 172.
  • the convex part 173 is a thick part of the valve body 172.
  • the two convex parts 173 press each other. That is, the convex portion 173 of one valve body 172 functions as a valve seat with respect to the other valve body 172. Thereby, it can prevent that a flow path is unintentionally opened due to the deformation
  • FIG. From the viewpoint of more reliably preventing the backflow of fluid, it is preferable that the two convex portions 173 are in contact with each other even in a state where the valve body 172 is not deformed. That is, the surface of the convex portion 173 on the side of the free end is preferably the end surface of the free end of the valve body 172.
  • the number, shape, and size (thickness) of the convex portions 173 can be appropriately changed according to the number, shape, and size of the valve body 172.
  • the number of convex portions 173 is two.
  • the planar view shape of the convex part 173 is a right-angled isosceles triangle.
  • Examples of the three-dimensional shape of the convex portion 173 include a triangular pyramid shape and a triangular prism shape.
  • the three-dimensional shape of the convex portion 173 is a substantially triangular pyramid shape protruding toward the second surface 1212.
  • the thickness of the convex portion 173 (the length of the convex portion 173 in the flow direction of the irrigation liquid) may or may not be constant. From the viewpoint of more reliably closing the flow path, it is preferable that the convex portion 173 includes a portion where the thickness of the convex portion 173 increases in the valve body 172 from the fixed end portion toward the free end portion. Thereby, the two convex parts 173 can press each other on a wider surface by the pressure of the fluid that flows back into the flow path from the discharge part 180 side.
  • the thickness of the portion of the valve body 172 where the convex portion 173 is not formed is sufficiently thinner than the thickness of the fixed portion 174.
  • the thickness of the portion only needs to be appropriately deformable according to the pressure of the irrigation liquid in the flow path, and can be adjusted as appropriate according to the material of the emitter body 121 and the like.
  • Both the planar view shape of the valve body 172 and the planar view shape of the fixing portion 174 are fan-shaped.
  • the shapes of the valve body 172 and the fixing portion 174 are the same as the fan shape that can be formed by dividing the circular shape into four equal parts.
  • the valve bodies 172 and the fixing portions 174 are alternately arranged along the circumferential direction.
  • the valve body 172 and the fixing portion 174 are adjacent to each other.
  • the fixing portion 174 is a convex portion protruding from the inner wall of the flow channel toward the center of the flow channel.
  • the fixing portion 174 is hardly deformed by the pressure of the irrigation liquid in the flow path.
  • the number, shape, and size of the fixing portions 174 can be appropriately adjusted according to the number, shape, and size of the valve body 172.
  • the number of fixing portions 174 is two.
  • the planar view shape of the fixing portion 174 is a fan shape.
  • the two fixing portions 174 are arranged so as to be in contact with each other at a portion corresponding to the fan-shaped apex.
  • the planar view shape of the fixing portion 174 is the same as the planar view shape of the valve element 172.
  • the downstream edge of the fixed portion 174 is in contact with the upstream edge of the valve body 172.
  • the thickness of the fixing portion 174 may be adjusted as appropriate as long as the fixing portion 174 is hardly deformed by the pressure of the irrigation liquid in the flow path.
  • the third connection through-hole 175 communicates with the upstream side of the flow path in the backflow prevention valve 170.
  • the third connection through hole 175 communicates with the flow rate reducing unit 160.
  • the third connection through hole 175 is disposed on the inner surface of the backflow prevention recess 171.
  • the third connection through-hole 175 is disposed, for example, on the bottom surface or side surface of the backflow prevention recess 171.
  • the third connection through hole 175 is disposed on the bottom surface of the protruding portion of the backflow prevention recess 171.
  • the discharge unit 180 discharges the irrigation liquid to the outside of the emitter 120.
  • the discharge unit 180 is disposed on the second surface 1212 side of the emitter body 121 so as to face the discharge port 112 of the tube 110.
  • the discharge unit 180 sends the irrigation liquid in the emitter 120 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 second surface 1212 of the emitter body 121.
  • a part of the bottom of the discharge recess 181 is configured by a valve body 172 and a fixing portion 174.
  • the shape of the discharge recess 181 in plan view is a substantially rectangular shape.
  • a valve body 172, a fixing portion 174, and an intrusion prevention portion 182 are disposed 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 is four convex portions arranged adjacent to each other. The four convex portions are arranged so as to be positioned between the valve body 172 and the discharge port 112 when the emitter 120 is joined to the tube 110.
  • irrigation liquid is fed into the tube 110.
  • 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.
  • the irrigation liquid in the tube 110 enters the water intake recess 153 through the slit 154 or the gap between the screen 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 projection ridge part 155), it is possible to remove the suspended matter in the irrigation liquid.
  • the so-called wedge wire structure is formed in the water intake part 150, the pressure loss of the irrigation liquid flowing into the water intake part 150 is suppressed.
  • 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.
  • the irrigation liquid that has flowed into the second reduced pressure channel 144 flows into the flow rate reduction unit 160 through the first connection through hole 164.
  • the irrigation liquid that has flowed into the flow reduction unit 160 flows into the backflow prevention valve 170 through the second connection through hole 165 and the third connection through hole 175.
  • the irrigation liquid that has flowed into the backflow prevention valve 170 deforms the valve body 172 of the backflow prevention valve 170 toward the downstream side, and passes through a gap formed between the valve body 172 and the fixing portion 174, and the discharge unit 180. Flow into.
  • 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.
  • FIG. 4A to 4C are schematic cross-sectional views for explaining the operation of the flow rate reducing unit 160 and the backflow prevention valve 170.
  • FIG. 4A to 4C are partially enlarged sectional views taken along line AA shown in FIG. 2B.
  • 4A is a cross-sectional view when the irrigation liquid is not supplied to the tube 110
  • FIG. 4B is a cross-sectional view when the pressure of the irrigation liquid in the tube 110 is the first pressure
  • FIG. 4C 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 flow rate reducing portion 160 and the backflow prevention valve 170 communicate with each other via the second connection through hole 165 and the third connection through hole 175.
  • the flow rate of the irrigation liquid is controlled by deforming the diaphragm unit 166 so as to be distorted toward the flow rate reduction concave portion 161 according to the pressure of the irrigation liquid in the tube 110.
  • the valve body 172 is deformed so as to be distorted downstream in accordance with the pressure of the irrigation liquid in the flow path, and the flow path is opened.
  • the cover 123 is made of a rigid material, it is not deformed by the pressure of the irrigation liquid.
  • the pressure of the irrigation liquid is not applied to the film 122, so the diaphragm portion 166 is not deformed (see FIG. 4A). Further, since the valve body 172 is not deformed, the flow path is closed in the backflow prevention valve 170.
  • the diaphragm 166 and the valve body 172 begin to deform (see FIG. 4B).
  • the irrigation liquid taken in from the water intake portion 150 passes through the flow path in the emitter 120 and is discharged from the discharge port 112 of the tube 110 to the outside.
  • the valve body 172 of the check valve 170 is distorted downstream.
  • a gap is formed between the valve body 172 and the fixed portion 174.
  • the irrigation liquid when the irrigation liquid is started to be fed into the tube 110 or when the pressure of the irrigation liquid in the tube 110 is lower than a predetermined pressure, the irrigation introduced into the emitter 120 from the water intake unit 150. The working liquid is discharged outside through the flow path.
  • the diaphragm portion 166 is further deformed toward the valve seat portion 162.
  • the first pressure reduction flow path 142 and the second pressure reduction liquid are increased.
  • the diaphragm portion 166 contacts the valve seat portion 162 (see FIG. 4C). Even in this case, the diaphragm portion 166 does not block the first connection through-hole 164, the second connection through-hole 165, and the communication groove 163. Therefore, the irrigation liquid introduced from the water intake portion 150 is not connected to the communication groove. Through 163, the liquid is discharged from the discharge port 112 of the tube 110 to the outside.
  • the flow reduction unit 160 makes the irrigation liquid flowing through the flow path when the diaphragm unit 166 contacts the valve seat 162. Suppresses increase in liquid volume.
  • the flow rate reducing unit 160 adjusts the flow rate of the irrigation liquid discharged from the discharge port 112 of the tube 110 in accordance with the deformation of the film 122 due to the pressure of the irrigation liquid in the tube 110. For this reason, the drip irrigation tube 100 according to the present embodiment can discharge a certain amount of irrigation liquid out of the tube 110 regardless of whether the pressure of the irrigation liquid is low or high.
  • the emitter 120 has a backflow prevention valve 170.
  • the pressure of the irrigation liquid in the flow path decreases, so that the valve deformed toward the downstream side of the flow path in the open state of the flow path.
  • the body 172 returns to the state before deformation. Thereby, the flow path is closed in the check valve 170.
  • the adjacent convex portions 173 press each other so that the valve body 172 does not deform toward the upstream. For this reason, even if the fluid flows backward from the discharge part 180 to the flow path, the closed state of the flow path is maintained. As a result, it is possible to prevent a fluid such as air or water containing fine soil existing outside the tube 110 from flowing upstream of the valve body 172.
  • the emitter 120 according to the present embodiment has the backflow prevention valve 170 including the valve body 172.
  • production of a siphon phenomenon can be suppressed. Therefore, according to the drip irrigation tube 100 having the emitter 120 according to the present embodiment, it is possible to suppress the occurrence of clogging of the flow path due to the siphon phenomenon even in a place with a height difference.
  • the backflow prevention valve 170 can be comprised by one member, the emitter main body 121 can be comprised by integral molding.
  • FIG. 5A and 5B are bottom views for illustrating the configuration of a part of the emitter 220 according to the second embodiment and for explaining the operation of the backflow prevention valve 270.
  • 5A is a bottom view when the irrigation liquid is not fed to the tube 110
  • FIG. 5B is a bottom view when the pressure of the irrigation liquid in the tube 110 is equal to or higher than a predetermined value. .
  • the emitter 220 according to the second embodiment includes an emitter body 221 and a film 122, and includes a water intake unit 150, a first connection channel 141, a first decompression channel 142, a second connection channel 143, and a second decompression.
  • a flow path 144, a flow rate reduction unit 160, a backflow prevention valve 270, and a discharge unit 180 are included.
  • the emitter 220 according to the second embodiment differs from the emitter 120 according to the first embodiment only in the configuration of the backflow prevention valve 270 and the point that the cover 123 is not provided. Therefore, the same components as those of the emitter 120 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
  • the emitter body 220 is the same as the emitter body 120 in the first embodiment, except that the configuration of the backflow prevention valve 270 is different from the backflow prevention valve 170 in the first embodiment.
  • the backflow prevention valve 270 has a backflow prevention recess 271 and two valve bodies 272.
  • the backflow preventing recess 271 is arranged on the second surface 1212 of the emitter body 221.
  • the backflow prevention recess 271 is disposed adjacent to the discharge recess 181.
  • the shape in plan view of the backflow preventing recess 271 is not particularly limited. In the present embodiment, the shape of the backflow preventing recess 271 is substantially rectangular.
  • a second connection through-hole 165 is open on the inner surface of the backflow prevention recess 271. In the present embodiment, the second connection through hole 165 is disposed on the bottom surface of the backflow prevention recess 271. The second connection through-hole 165 opens to the inner surface of the flow rate reducing recess 161 and the inner surface of the backflow prevention recess 271.
  • the depth of the backflow prevention recess 271 is substantially the same as the length of the valve body 272 in the depth direction of the backflow prevention recess 271. Thereby, when the valve body 272 is disposed in the recess 271 for preventing backflow, the flow path can be blocked. As a result, the flow path can be opened and closed by the deformation of the valve body 272 due to the pressure of the irrigation liquid.
  • the valve body 272 is deformed downstream in accordance with the pressure of the irrigation liquid flowing toward the discharge unit 180. On the other hand, the valve body 272 is not deformed upstream by the fluid flowing backward from the discharge part 180 to the flow path. As described above, the two valve bodies 272 are disposed so as to block the flow path. The upstream and downstream of the valve body 272 in the flow path communicate with each other through a gap formed between the two valve bodies 172 in the open state of the flow path.
  • the valve body 272 is disposed in a portion of the flow path that extends along the surface direction of the second surface 1212. That is, the valve body 272 is disposed in the backflow prevention recess 271 whose opening is disposed on the second surface 1212.
  • the number, shape, and size of the valve body 272 are not particularly limited as long as the above functions can be exhibited. In this Embodiment, it is a plate
  • the number of valve bodies 272 is two. The two valve bodies 272 are disposed so as to be in contact with each other at the distal end portion.
  • the valve body 272 includes a fixed end fixed to the inner wall of the flow path and a free end positioned on the opposite side of the fixed end.
  • the fixed end portion is fixed to the side surface of the flow path.
  • the fixed end portion is a base end portion of the plate-shaped valve body 272.
  • the upper surface of the valve body 272 is in contact with the inner wall surface of the tube 110, and the lower surface of the valve body 272 is in contact with the bottom surface of the backflow prevention recess 271.
  • the free end is the tip (top) of the plate-shaped valve body 272.
  • a convex portion 273 that protrudes toward the downstream side of the flow path is formed at the free end portion of the valve body 272.
  • the convex portion 273 is formed on each of the free end portions of the two valve bodies 272.
  • the convex part 273 is a thick part of the valve body 272.
  • the two convex portions 273 are pressed against each other. That is, the convex part 273 of one valve body 272 functions as a valve seat with respect to the other valve body 272. Thereby, it can prevent that a flow path is unintentionally opened due to the deformation
  • FIG. From the viewpoint of more reliably preventing the backflow of fluid, it is preferable that the two convex portions 273 are in contact with each other even in a state where the valve body 272 is not deformed. That is, the surface of the convex portion 273 on the free end side is preferably the end surface of the free end portion of the valve body 272.
  • the number, shape, and size (thickness) of the convex portions 273 can be appropriately changed according to the number, shape, and size of the valve body 272.
  • the number of convex portions 273 is two.
  • the planar view shape of the convex part 273 is a trapezoid.
  • An example of the three-dimensional shape of the convex portion 273 is a polygonal column shape.
  • the three-dimensional shape of the convex portion 273 is a quadrangular prism shape.
  • the thickness of the convex portion 273 (the length of the convex portion 273 in the flow direction of the irrigation liquid) may or may not be constant. From the viewpoint of more reliably closing the flow path, the convex portion 273 preferably includes a portion where the thickness of the convex portion 273 increases in the valve body 272 from the fixed end portion toward the free end portion. Thereby, the two convex parts 273 can press each other on a wider surface by the pressure of the fluid that flows back into the flow path from the discharge part 180 side.
  • the thickness of the portion of the valve body 272 where the convex portion 273 is not formed is only required to be appropriately deformable according to the pressure of the irrigation liquid in the flow path, and is appropriately determined according to the material of the emitter body 221 and the like. Can be adjusted.
  • valve body 272 In the valve body 272 according to the second embodiment, a convex portion 273 that protrudes to the downstream side of the flow path is formed. Thereby, similarly to the valve body 172 in Embodiment 1, it can prevent that the valve body 272 deform
  • the emitter 220 and drip irrigation tube according to the second embodiment have the same effects as the first embodiment.
  • the valve body 272 is disposed in the backflow prevention recess 271 disposed on the second surface 1212 of the emitter body 221. Since the opening of the backflow prevention recess 271 is closed by the inner wall surface of the tube 110, a separate member (the cover 123 in Embodiment 1) for closing the opening of the backflow prevention recess 271 is not required. Therefore, the second embodiment is more preferable from the viewpoint of reducing the number of components of the emitter 220.
  • the configuration of the emitter according to the present invention is It is not limited to an aspect.
  • the number of valve bodies may be one or three or more.
  • the inner wall of the flow path functions as a valve seat.
  • the emitter and the drip irrigation tube according to the present invention are not limited to the emitters 120 and 220 and the drip irrigation tube 100 according to the first and second embodiments.
  • the emitter is the first decompression channel. 142, the second decompression flow path 144, and the flow rate adjustment unit 160 may not be provided.
  • the emitter is constituted by at least an emitter body and a cover.
  • the emitters 120 and 220 and the tube 110 are joined, so that the first connection channel 141, the first decompression channel 142, the second connection channel 143, and the second decompression flow.
  • the path 144 is formed has been described, the first connection flow path 141, the first pressure reduction flow path 142, the second connection flow path 143, and the second pressure reduction flow path 144 are previously provided as flow paths in the emitter 120. It may be formed.
  • the emitter 120 having the fixing portion 174 has been described.
  • the emitter according to the present invention may not have the fixing portion 174.
  • the emitter according to the present invention it is possible to suppress the occurrence of clogging caused by the backflow of the fluid outside the tube to the flow path even in a place with a height difference. Therefore, further development of drip irrigation is expected.
  • Tube for drip irrigation 110
  • Tube 112 Discharge port 120, 220 Emitter 121, 221 Emitter body 1211 First surface 1212 Second surface 122 Film 123 Cover 131 First connection groove 132 First pressure reduction groove 133 Second connection groove 134 Second pressure reduction Groove 1361 First convex part 1362 Second convex part 141 First connection flow path 142 First decompression flow path 143 Second connection flow path 144 Second decompression flow path 150 Water intake part 151 Water intake side screen part 152 Water intake through hole 153 Water intake Recessed portion 154 Slit 155 Screen convex portion 160 Flow rate reducing portion 161 Flow rate reducing recess portion 162 Valve seat portion 163 Communication groove 164 First connection through hole 165 Second connection through hole 166 Diaphragm portion 170, 270 Backflow prevention valve 171 , 271 Backflow recess 172, 272 Valve 173,273 protrusions 174 fixed portion 175 third connecting holes 180 discharge portion 181 the discharge recess 182 intrusion preventing portion

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

Abstract

La présente invention concerne un émetteur pourvu d'une partie d'admission d'eau, d'une partie d'évacuation, d'un trajet d'écoulement et d'une soupape de non-retour. La partie d'admission d'eau prélève un liquide d'irrigation. La partie d'évacuation évacue le liquide d'irrigation. Le trajet d'écoulement relie la partie d'admission d'eau et la partie d'évacuation, et fait circuler le liquide d'irrigation. La soupape de non-retour est disposée sur le trajet d'écoulement, ouvre le trajet d'écoulement pour le liquide d'irrigation s'écoulant vers la partie d'évacuation, et ferme le trajet d'écoulement pour le fluide s'écoulant à travers le trajet d'écoulement à partir de la partie d'évacuation. La soupape de non-retour est pourvue d'un corps de soupape et d'une saillie. Le corps de soupape comprend : une partie d'extrémité fixe qui est fixée à une paroi interne du trajet d'écoulement ; et une partie d'extrémité libre qui est positionnée du côté opposé à la partie d'extrémité fixe. La saillie fait saillie vers le côté aval du trajet d'écoulement au niveau de la partie d'extrémité libre.
PCT/JP2018/010947 2017-04-12 2018-03-20 Émetteur et tube d'irrigation par goutte à goutte Ceased WO2018190084A1 (fr)

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JP2017078670A JP6837377B2 (ja) 2017-04-12 2017-04-12 エミッタおよび点滴灌漑用チューブ
JP2017-078670 2017-04-12

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3491912A4 (fr) * 2016-08-01 2020-03-25 Enplas Corporation Émetteur et tube d'irrigation goutte-à-goutte

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150041563A1 (en) * 2013-08-12 2015-02-12 Rain Bird Corporation Elastomeric emitter and methods relating to same
WO2015105082A1 (fr) * 2014-01-10 2015-07-16 株式会社エンプラス Goutteur et tube d'irrigation goutte à goutte
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
JP2018014906A (ja) * 2016-07-26 2018-02-01 株式会社エンプラス 点滴灌漑用チューブおよび点滴灌漑システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150041563A1 (en) * 2013-08-12 2015-02-12 Rain Bird Corporation Elastomeric emitter and methods relating to same
WO2015105082A1 (fr) * 2014-01-10 2015-07-16 株式会社エンプラス Goutteur et tube d'irrigation goutte à goutte
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
JP2018014906A (ja) * 2016-07-26 2018-02-01 株式会社エンプラス 点滴灌漑用チューブおよび点滴灌漑システム

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3491912A4 (fr) * 2016-08-01 2020-03-25 Enplas Corporation Émetteur et tube d'irrigation goutte-à-goutte
US10869435B2 (en) 2016-08-01 2020-12-22 Enplas Corporation Emitter and drip-irrigation tube

Also Published As

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JP2018174789A (ja) 2018-11-15

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