WO2015029932A1 - ドリッパおよび点滴灌漑用チューブ - Google Patents
ドリッパおよび点滴灌漑用チューブ Download PDFInfo
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- WO2015029932A1 WO2015029932A1 PCT/JP2014/072113 JP2014072113W WO2015029932A1 WO 2015029932 A1 WO2015029932 A1 WO 2015029932A1 JP 2014072113 W JP2014072113 W JP 2014072113W WO 2015029932 A1 WO2015029932 A1 WO 2015029932A1
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- WIPO (PCT)
- Prior art keywords
- dripper
- flow path
- pressure
- tube
- liquid
- Prior art date
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
- A01G25/023—Dispensing fittings for drip irrigation, e.g. drippers
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- 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 a dripper and a drip irrigation tube having the dripper.
- Drip irrigation method is known as one of the plant cultivation methods.
- a drip irrigation tube is placed on the soil in which plants are planted, and a irrigation liquid such as water or liquid fertilizer is slowly supplied from the drip irrigation tube to the soil. It is.
- the drip irrigation method can minimize the consumption of the liquid and has attracted particular attention in recent years.
- the above-mentioned drip irrigation tube usually has a tube and a dripper.
- the dripper usually supplies the irrigation liquid in the space in the tube to the soil at a speed set so that the irrigation liquid is dropped onto the soil.
- the dripper there are known a dripper that is installed by piercing the tube from the outside, and a dripper that is bonded to the inner wall surface of the tube.
- the latter dripper includes, for example, a flow path including a pressure reducing flow path for flowing liquid flowing into the dripper from a space in the tube while reducing the pressure toward the through hole of the tube, and the reduced pressure irrigation of the flow path. And a diaphragm portion that changes the volume of the portion through which the liquid flows according to the pressure of the liquid in the space.
- the dripper is composed of three members: a member bonded to the inner wall surface of the tube, a member disposed thereon, and a diaphragm portion disposed between the two members.
- the said diaphragm part is comprised by the film
- the dripper can suppress variations in the amount of liquid discharged for irrigation regardless of fluctuations in the pressure of the liquid in the space in the tube. Therefore, the dripper is advantageous from the viewpoint of uniformly growing a plurality of plants.
- the dripper is constructed by assembling three members. For this reason, an assembly error may occur in the dripper.
- an assembly error related to the diaphragm portion may cause variations in the operation of the diaphragm portion, and may cause variations in the discharge amount of the irrigation liquid.
- the dripper is usually a molded product of an inexpensive resin such as polyethylene or polypropylene, but a member of another more expensive material having elasticity, such as a silicone rubber film, is used for the diaphragm portion.
- a member of another more expensive material having elasticity such as a silicone rubber film
- the drip irrigation tube several hundred drippers may be arranged in one tube. For this reason, when the dripper adhered to the inner wall surface of the tube is large, the pressure loss of the liquid flowing in the tube increases. For this reason, in a long drip irrigation tube, it is necessary to increase the supply pressure of the liquid to the tube, and the amount of liquid discharged from the dripper may not be stable. Therefore, further downsizing of the dripper is required from the viewpoint of suppressing the pressure loss of the liquid in the tube.
- the dripper according to the present invention is a flow path that connects the space in the tube and the through hole by being bonded to the inner wall surface of the tube at a position covering the through hole formed in the wall of the tube, A dripper that constitutes a flow path including a pressure reducing flow path for flowing the liquid flowing in from the space while reducing the pressure toward the through hole, and is adhered to the inner wall surface of the tube, thereby A dripper main body that constitutes the flow path including the open portion that is open, and closes the open portion from the space side, and is arranged to be able to advance and retreat in the open portion according to the pressure of the liquid in the space. And a movable part for changing a cross-sectional area of the flow path in the open part according to the pressure.
- the drip irrigation tube according to the present invention includes a tube and the dripper.
- the dripper according to the present invention can be composed of only two members: a dripper main body and a movable part that is movable under the pressure of the liquid in the tube.
- the dripper according to the present invention since the dripper according to the present invention has a movable part, it is possible to suppress fluctuations in the discharge amount of the liquid due to fluctuations in the pressure of the liquid in the tube. Since the diaphragm portion sandwiched between the two members is not required to suppress the fluctuation of the liquid discharge amount, the dripper according to the present invention is smaller (thinner) than the dripper having the diaphragm portion. It is possible.
- the dripper according to the present invention is advantageous for suppressing an increase in pressure loss of the liquid in the tube, and is advantageous for discharging the irrigation liquid with a stable discharge amount.
- the dripper according to the present invention can further reduce manufacturing costs as compared with a dripper constituted by three members.
- FIG. 1A is a schematic plan view of a drip irrigation tube according to Embodiment 1 of the present invention
- FIG. 1B is a cross-sectional view of the drip irrigation tube taken along line AA in FIG. 1A.
- FIG. 3 is an enlarged view showing a cross section of a dripper in the drip irrigation tube according to the first embodiment.
- FIG. 3A is a diagram illustrating a plane, a front surface, and a side surface of the dripper according to Embodiment 1
- FIG. 3B is a diagram illustrating a bottom surface, a front surface, and a side surface of the dripper.
- 4A is a plan view of the dripper according to Embodiment 1
- FIG. 4B is a front view of the dripper
- FIG. 4A is a plan view of the dripper according to Embodiment 1
- FIG. 4B is a front view of the dripper
- FIG. 4A is a plan view of the dripper according to Embodiment 1
- FIG. 4C is a bottom view of the dripper
- FIG. 4D is a side view of the dripper.
- It is. 5A is a plan view of the dripper body in Embodiment 1
- FIG. 5B is a front view of the dripper body
- FIG. 5C is a bottom view of the dripper body
- FIG. 5D is the dripper body.
- FIG. 6A is a plan view of the movable part in Embodiment 1
- FIG. 6B is a front view of the movable part
- FIG. 6C is a bottom view of the movable part
- FIG. 6D is the movable part.
- FIG. FIG. FIG. 1 is a plan view of the movable part in Embodiment 1
- FIG. 6B is a front view of the movable part
- FIG. 6C is a bottom view of the movable part
- FIG. 6D is the movable part.
- FIG. 7A is a side view schematically showing a state before the movable part of the dripper according to Embodiment 1 moves, and FIG. 7B schematically shows a state after the movable part of the dripper has moved. It is a side view.
- FIG. 8A is a diagram schematically showing a cross-section along the line AA in FIG. 4C of the dripper according to Embodiment 1 before the movable part moves, and FIG. 8B shows the movable part moving.
- 4D is a diagram schematically showing a cross section of the dripper after being taken along the line AA in FIG. 4C.
- FIG. FIG. 9A is a diagram illustrating a plane, a front surface, and a side surface of the dripper according to Embodiment 2, and FIG.
- FIG. 9B is a diagram illustrating a bottom surface, a front surface, and a side surface of the dripper.
- 10A is a plan view of the dripper according to Embodiment 2
- FIG. 10B is a front view of the dripper
- FIG. 10C is a bottom view of the dripper
- FIG. 10D is a side view of the dripper.
- FIG. 11A is a diagram schematically showing a cross section along the line AA in FIG. 10C of the dripper according to Embodiment 2 before the movable part moves
- FIG. 11B shows the movement of the movable part.
- FIG. 10D is a diagram schematically showing a cross section of the dripper after being taken along the line AA in FIG. 10C.
- FIG. 12A is a diagram illustrating a plane, a front surface, and a side surface of the dripper according to Embodiment 3
- FIG. 12B is a diagram illustrating a bottom surface, a front surface, and a side surface of the dripper.
- FIG. 13A is a bottom view of the dripper according to Embodiment 3
- FIG. 13B is a diagram schematically showing a cross section of the dripper along the line AA in FIG. 13A.
- 14A is a plan view of the dripper body in Embodiment 3
- FIG. 14B is a front view of the dripper body
- FIG. 14C is a bottom view of the dripper body
- FIG. 14D is the dripper body.
- FIG. 14A is a plan view of the dripper body in Embodiment 3
- FIG. 14B is a front view of the dripper body
- FIG. 14C is a bottom view of the dripper body
- FIG. 14D is the dripper body.
- FIG. 15A is a plan view of the movable part in Embodiment 3
- FIG. 15B is a front view of the movable part
- FIG. 15C is a bottom view of the movable part
- FIG. 15D is the movable part.
- FIG. FIG. 16A is a diagram schematically showing a cross section along the line AA in FIG. 13A of the dripper according to Embodiment 3 before the movable part moves
- FIG. 16B shows the movement of the movable part. It is a figure which shows typically the cross section along the AA in FIG. 13A of the said dripper after having carried out.
- FIG. 1A is a schematic plan view of a drip irrigation tube according to Embodiment 1 of the present invention
- FIG. 1B is a cross-sectional view of the drip irrigation tube taken along line AA in FIG. 1A. It is.
- the drip irrigation tube 100 includes a tube 110 and a dripper 120.
- the tube 110 is made of, for example, polyethylene, and the dripper 120 is made of, for example, polypropylene.
- the drippers 120 are arranged at a predetermined interval (for example, 200 to 500 mm) in the axial direction of the tube 110. Each dripper 120 is fixed to the inner wall surface of the tube 110 by welding.
- the dripper 120 is disposed at a position covering the through hole 130 of the tube 110. More specifically, the dripper 120 is disposed such that a discharge portion described later covers the through hole 130.
- the hole diameter of the through hole 130 is, for example, 1.5 mm.
- the through hole 130 is usually formed after the dripper 120 is welded.
- FIG. 2 is an enlarged view showing a cross section of the dripper in the drip irrigation tube according to the present embodiment.
- FIG. 3A is a diagram illustrating a plane, a front surface, and a side surface of the dripper according to the present embodiment
- FIG. 3B is a diagram illustrating a bottom surface, a front surface, and a side surface of the dripper.
- 4A is a plan view of the dripper according to the present embodiment
- FIG. 4B is a front view of the dripper
- FIG. 4C is a bottom view of the dripper
- FIG. 4D is a side view of the dripper. It is.
- the dripper 120 has a dripper body 121 and a movable portion 122 that engages with the dripper body 121.
- the dripper 120 constitutes a liquid flow path that communicates the internal space of the tube 110 and the through hole 130 independently of the internal space of the tube 110.
- the flow path includes an inflow part 124, a decompression flow path 125, and a discharge part 126.
- the inflow portion 124 is communicated with the internal space of the tube 110 through the inflow port 123.
- the decompression flow path 125 is configured by fitting a protrusion, which will be described later, of the movable part 122 into an opening, which will be described later, of the dripper body 120.
- a recess (also referred to as “upper surface side recess”) is formed in the plane (upper surface) of the dripper 120, and a plurality of ridges 1201 are formed in the upper surface side recess. Is arranged.
- the ridge 1201 extends in the short direction Y of the dripper 120 and is parallel to the long direction X of the dripper 120. In the Y direction, both ends of the ridge 1201 are separated from the side wall of the upper surface side recess.
- the height of the ridge 1201 is, for example, 0.5 mm
- the interval between the ridges 1201 (the distance between the central axes of the ridges 1201) is, for example, 0.5 mm.
- a plurality of inflow ports 123 are arranged at one end in the X direction at the bottom of the upper surface side concave portion.
- the inflow ports 123 are arranged in a line along the ridge 1201 (in the Y direction).
- the inflow port 123 is a hole that penetrates the bottom of the upper surface side recess, and communicates the upper part of the dripper 120 with the inflow part 124.
- the hole diameter of the inflow port 123 is, for example, 0.3 mm.
- the inflow portion 124 and the discharge portion 126 are rectangular recesses (“bottom side recesses”) that are disposed at the ends of the dripper body 121 and are recessed from the bottom surface of the dripper body 121. It is also called).
- the height of the inflow portion 124 (the depth of the bottom-side recess on one end side in the X direction) is, for example, 1.0 mm
- the height of the discharge portion 126 (the depth of the bottom-side recess on the other end side in the X direction). Is, for example, 1.0 mm.
- the decompression flow path 125 communicates the inflow part 124 and the discharge part 126 as shown in FIG. 4C.
- the planar shape of the decompression flow path 125 is a zigzag shape. In the zigzag shape, convex portions having a substantially triangular prism shape protruding from the side surface of the decompression flow path 125 are alternately arranged along the longitudinal direction of the decompression flow path 125. The convex portion is formed such that the protruding end of the convex portion does not exceed the central axis in the planar shape of the decompression flow path 125.
- Both end portions of the decompression flow path 125 are configured only by the dripper main body 121, and the protrusions of the movable portion 122 are fitted to the open portions formed in the dripper main body 121 in the other portions of the decompression flow path 125. (FIGS. 4B and 4C).
- FIG. 5A is a plan view of the dripper body in the present embodiment
- FIG. 5B is a front view of the dripper body
- FIG. 5C is a bottom view of the dripper body
- FIG. 5D is the dripper body.
- the dripper body 121 is made of, for example, polypropylene. As shown in FIGS. 5A to 5C, the dripper main body 121 has a first end portion 1211, a second end portion 1212, and a connecting portion 1213.
- the first end portion 1211 includes the above-described upper surface side concave portion, the ridge 1201, the inflow port 123, and the inflow portion 124.
- the second end portion 1212 includes an upper surface side concave portion, a protruding line 1201, and a discharge portion 126.
- first end portion 1211 and the second end portion 1212 both have elastic support portions 1214 and 1215 on both sides of the first end portion 1211 and the second end portion 1212, respectively.
- Each of the elastic support portions 1214 and 1215 is disposed at a relatively high position on the plane (upper surface) side than the center of the dripper body 121 in the height (thickness) direction.
- the elastic support portion 1214 is a plate-like elastic member that protrudes from the end surface of the first end portion 1211 on the second end portion 1212 side.
- the elastic support portion 1215 is a plate-like elastic member that protrudes from the end surface of the second end portion 1212 on the first end portion 1211 side.
- any plane (upper surface) of the elastic support portions 1214 and 1215 is parallel to the upper surface of the dripper body 121. Moreover, the inclined surface which inclines toward the bottom face side from the upper surface side is formed in the front-end
- the connecting part 1213 connects the first end part 1211 and the second end part 1212.
- the planar shape of the connecting portion 1213 is a substantially cross shape in which the four corners of the rectangle are cut into a rectangular shape that is substantially the same shape as the planar shape of the elastic support portions 1214 and 1215.
- the connecting portion 1213 has a bottom surface that is flush with the bottom surface of the first end portion 1211 and the bottom surface of the second end surface 1212.
- the thickness (height) of the connecting portion 1213 is less than half the height of the dripper body 121 and is slightly larger than the height of the decompression flow path 125.
- the height of the connecting portion 1213 is about 1.3 times the height of the decompression flow path 125.
- the connecting portion 1213 includes an open portion 1216 in which portions excluding both end portions of the decompression flow path 125 are open to the internal space of the tube 110.
- the planar shape of the open portion 1216 is the same as the zigzag shape of the decompression flow path 125 as shown in FIGS. 5A and 5C.
- the opening portion 1216 is formed by a notch that penetrates the connecting portion 1213 in the thickness direction of the connecting portion 1213.
- FIG. 6A is a plan view of the movable part in the present embodiment
- FIG. 6B is a front view of the movable part
- FIG. 6C is a bottom view of the movable part
- FIG. 6D is the movable part.
- the movable part 122 is made of, for example, polypropylene.
- the movable portion 122 includes a pressure receiving portion 1221, a spacer portion 1222, an engaging portion 1223, and a protrusion 1224 as shown in FIGS. 6A to 6D.
- the pressure receiving part 1221 constitutes the upper surface of the movable part 122.
- the pressure receiving part 1221 includes the above-described depressions and ridges 1201.
- the planar shape of the pressure receiving portion 1221 is substantially rectangular, but its four corners are slightly cut out into a rectangle.
- the length of this notch in the X direction is several mm, and the length in the Y direction is substantially the same as the length of the elastic support portion 1215 in the Y direction. Also.
- a linear notch is formed for each notch along the X direction from the notch.
- the spacer portion 1222 is disposed on the bottom surface side of the pressure receiving portion 1221.
- the planar shape of the spacer portion 1222 is a rectangle.
- the length of the spacer portion 1222 in the X direction is shorter than the distance between the leading edges of the elastic support portions 1214 and 1215 of the dripper body 121, and the length of the spacer portion 1222 in the Y direction is the length of the pressure receiving portion 1221 in the Y direction. Is almost the same.
- the thickness of the spacer portion 1222 is substantially the same as the thickness of each of the elastic support portions 1214 and 1215.
- the spacer portion 1222 is the center of the movable portion 122 in the X direction, and is disposed at a position where it does not contact the leading edges of the elastic support portions 1214 and 1215.
- the engaging portion 1223 is a portion connected to the bottom surface side of the spacer portion 1222.
- the planar shape of the engaging portion 1223 is a rectangle. Both end portions of the bottom surface in the X direction of the engaging portion 1223 are formed with inclined surfaces that are inclined from the bottom surface side to the top surface side.
- the length in the X direction of the engaging portion 1223 is substantially the same as the length in the X direction of the notched portions on both sides of the pressure receiving portion 1221.
- the length of the engaging portion 1223 in the Y direction is substantially the same as the length of the pressure receiving portion 1221 in the Y direction.
- the protrusion 1224 is a portion that is connected to the bottom surface side of the engaging portion 1223.
- the planar shape of the protrusion 1224 is the same as the planar shape of the opening 1216 of the dripper body 121, as shown in FIG. 6C.
- the protrusion height of the protrusion 1224 is the movable distance + ⁇ of the movable portion 122.
- the movable distance is a distance from the bottom surface of the spacer portion 1222 to the upper surface of the connecting portion 1213 of the dripper body 121, and is 0.5 mm, for example.
- ⁇ is a distance for slightly fitting the tip of the protrusion 1224 to the opening 1216 in order to align the position of the protrusion 1224, and is, for example, about 0.25 mm.
- the dripper 120 is assembled by placing the movable portion 122 on the connecting portion 1213 and pushing it toward the connecting portion 1213.
- the elastic support portions 1214 and 1215 are bent, the inclined surface of the distal end portion of the engaging portion 1223 slides on the inclined surface of the elastic support portions 1214 and 1215, and the elastic support portions 1214 and 1215 are connected to the pressure receiving portion 1221. It fits into the gap with the engaging portion 1223.
- the elastic support portions 1214 and 1215 support the pressure receiving portion 1221 and engage with the engaging portion 1223.
- the movable portion 122 is supported by the dripper main body 121 so as to be movable by the elasticity of the elastic support portions 1214 and 1215.
- the protrusion 1224 of the movable portion 122 closes the opening portion 1216 from above and slightly fits into the opening portion 1216 of the dripper body 121. By the fitting, the decompression flow path 125 is formed.
- FIG. 7A is a side view schematically showing a state before the movable part of the dripper according to the present embodiment is moved
- FIG. 7B is a side view schematically showing a state after the movable part of the dripper is moved.
- FIG. 8A is a diagram schematically showing a cross section along the line AA in FIG. 4C of the dripper according to the present embodiment before the movable part moves
- FIG. 8B shows the movable part.
- FIG. 5D is a diagram schematically showing a cross section along the line AA in FIG. 4C of the dripper after the movement.
- the movable part 122 does not move as shown in FIGS. 7A and 8A.
- the height h 0 of the decompression flow path 125 (distance from the bottom surface of the connecting portion 1213 to the tip of the protrusion 1224) is, for example, 0.75 mm.
- the cross-sectional area of the decompression flow path 125 is the largest.
- the pressure receiving part 1221 When the pressure receiving part 1221 receives a sufficient pressure, as shown in FIGS. 7B and 8B, the movable part 122 is urged toward the bottom surface side of the dripper 120, and an elastic support part 1214 for instructing the movable part 122, 1215 bends. For this reason, the movable portion 122 moves to the bottom surface side, and the protrusion 1224 further advances while sliding on the opening portion 1216. Therefore, the height h 1 of the decompression flow path 125 in this case is smaller than h 0 , for example, 0.25 mm.
- the movable portion 122 moves upward while sliding on the opening portion 1216 due to the elasticity of the elastic support portions 1214 and 1215, and the height of the decompression flow path 125 is also increased.
- the height of the vacuum channel 125 in this case is h 0.
- the movable portion 122 moves forward and backward while sliding with respect to the open portion 1216 in accordance with the pressure applied to the pressure receiving portion 1221, and the height of the pressure reducing passage 125 (the cross-sectional area of the pressure reducing passage 125) varies. To do.
- the operation of the dripper 120 in the drip irrigation tube 100 will be described.
- Liquid is supplied to the drip irrigation tube 100 shown in FIG.
- the direction in which the liquid flows is the X direction.
- the liquid is filled in the gaps between the ridges 1201.
- On the upper surface of the dripper 120 ridges 1201 are arranged in parallel along the longitudinal direction (X direction), and there is a gap between both ends of the ridges 1201 in the Y direction and the side walls of the upper surface side recesses. For this reason, even if floating substances such as fallen leaves in the liquid stick to the upper surface of the dripper 120, the entire gap between the ridges 1201 is not blocked. Therefore, the gap where the inflow port 123 between the ridges 1201 opens is always filled with liquid.
- the protruding line 1201 has a filter function.
- the inlet 123 is a through-hole formed in the polypropylene dripper body 121.
- the inflow port 123 has water repellency peculiar to polypropylene. Therefore, when the pressure of the liquid is equal to or higher than a specific pressure (for example, 0.005 MPa, this pressure is also referred to as “breaking pressure”), the liquid that fills the gap overcomes the surface tension of the liquid due to the water repellency and flows. It flows into the inflow part 124 from the inlet 123.
- a specific pressure for example, 0.005 MPa, this pressure is also referred to as “breaking pressure”
- the liquid that fills the gap overcomes the surface tension of the liquid due to the water repellency and flows. It flows into the inflow part 124 from the inlet 123.
- the inflow port 123 has a low-pressure stop function for stopping the inflow of liquid that does not reach a specific pressure.
- the low-pressure stop function can be adjusted by the hole diameter, pitch, number, opening shape, length (the
- the liquid having a pressure equal to or higher than the breakdown pressure flows into the inflow portion 124 and then flows through the decompression flow path 125.
- the liquid flowing through the decompression channel 125 is decompressed by the pressure loss caused by the planar shape (zigzag shape) of the decompression channel 125.
- the decompressed liquid is stored in the discharge unit 126.
- the liquid stored in the discharge unit 126 is discharged from the through hole 130.
- the liquid discharged from the through hole 130 is dropped onto the soil from the drip irrigation tube 100, for example.
- the pressure of the liquid in the drip irrigation tube 100 is within a range from the breaking pressure to a specific pressure larger than the breaking pressure (for example, 0.05 MPa, this pressure is also referred to as “moving start pressure”).
- the movable part 122 does not move. This is because the elasticity of the elastic support portions 1214 and 1215 overcomes the pressure applied to the pressure receiving portion 1221. During this time, the liquid discharge speed from the through hole 130 is substantially constant at the set speed.
- the pressure applied to the pressure receiving portion 1221 overcomes the elasticity of the elastic support portions 1214 and 1215, and the movable portion 122 becomes 0 according to the pressure. It moves toward the bottom side of the dripper 120 within a distance range of less than 5 mm.
- the height of the decompression flow path 125 is, for example, 0.5 mm, and the amount of liquid flowing through the decompression flow path 125 is limited.
- the increase in the liquid flow rate due to the increase in the pressure is offset by the decrease in the liquid flow rate due to the reduction in the cross-sectional area of the decompression flow path 125, and the speed at which the liquid is supplied to the discharge unit 126 is maintained substantially constant. The Therefore, the discharge speed of the liquid from the through hole 130 is maintained at the above set speed.
- the pressure of the liquid in the drip irrigation tube 100 becomes equal to or higher than a specific pressure (for example, 0.1 MPa, this pressure is also referred to as “maximum movable pressure”) greater than the movable start pressure, the movable portion 122 Further energized by pressure.
- a specific pressure for example, 0.1 MPa, this pressure is also referred to as “maximum movable pressure”
- the movable portion 122 Further energized by pressure.
- the height of the decompression flow path 125 is minimized (the aforementioned h 1, eg, 0.25 mm), and the amount of liquid flowing through the decompression flow path 125 is further limited.
- the increase in the liquid flow rate due to the further increase in the pressure is offset by the decrease in the liquid flow rate due to the further reduction in the cross-sectional area of the decompression flow path 125, and the speed at which the liquid is supplied to the ejection portion 126 is still approximately Maintained constant. Therefore, the discharge speed of the liquid from the through hole 130 is maintained at the above set speed.
- the dripper 120 includes the dripper main body 121 that constitutes a flow path that opens a part of the decompression flow path 125 (open part 1216) to the space inside the tube 110, and the open part 1216. And a movable portion 122 that is closed from the space side and is disposed in the opening portion 1216 so as to be able to advance and retract according to the pressure of the liquid in the tube 110. Therefore, the dripper 120 can suppress a change in the discharge amount due to an increase in the pressure of the flowing liquid. For this reason, the dripper 120 can discharge the liquid at a constant flow rate regardless of the fluctuation of the pressure.
- the dripper 120 can be constituted by only two members, the dripper main body 121 and the movable portion 122. Therefore, the dripper 120 can be further reduced in size (thinned) as compared with a conventional dripper having three members and having a diaphragm portion.
- the dripper 120 can be further reduced in size, it is possible to further suppress an increase in the pressure loss of the liquid in the tube 110 as compared with the conventional dripper. As a result, it is possible to send the liquid in the drip irrigation tube 100 far away with low pressure. For this reason, according to the present embodiment, even with a longer drip irrigation tube 100, the effect of discharging a liquid in a stable amount can be obtained.
- the dripper 120 can further reduce the material cost and the manufacturing cost (assembly cost) as compared with the conventional dripper.
- the dripper main body 121 further includes an inflow port 123 having a low-pressure stop function, from the viewpoint of appropriately controlling the pressure of the liquid flowing into the dripper 120 from the drip irrigation tube 100 and appropriately using the liquid. Even more effective.
- the dripper 120 does not have a diaphragm part in the discharge part 126. Therefore, when the through hole 130 of the drip irrigation tube 100 is formed after the dripper 120 is welded, there is no possibility of damaging the diaphragm portion. Thus, even if the dripper 120 forms the through hole 130 after the dripper 120 is welded, the pressure adjusting function of the dripper 120 is not impaired. Therefore, according to the present embodiment, the drip irrigation tube 100 can be manufactured more easily, and the reliability of the drip irrigation tube 100 can be further improved.
- the inflow portion 124 and the discharge portion 126 are connected only by the decompression flow path 125. For this reason, it is possible to shorten the length of the dripper main body 121 in the X direction. Therefore, the dripper 120 is advantageous also from the viewpoint of miniaturization of the dripper 120 in the X direction.
- Embodiment 2 This embodiment is the same as the first embodiment described above except that the structure of the dripper is different.
- the dripper according to the present embodiment is different from the first embodiment in that it further includes a communication channel that connects the decompression channel and the discharge unit, and the movable unit changes the cross-sectional area of the communication channel. .
- symbol is used and description is abbreviate
- FIG. 9A is a diagram showing a plane, a front surface, and a side surface of the dripper according to the present embodiment
- FIG. 9B is a diagram showing a bottom surface, a front surface, and a side surface of the dripper according to the present embodiment
- 10A is a plan view of the dripper according to the present embodiment
- FIG. 10B is a front view of the dripper
- FIG. 10C is a bottom view of the dripper
- FIG. 10D is a side view of the dripper. It is.
- the dripper 220 includes a dripper main body 221 and a movable portion 222.
- the dripper main body 221 has a first end portion 2211, a second end portion 1212, and a connecting portion 2213.
- the first end portion 2211 includes an inflow port 123, an inflow portion 124, and a decompression channel 225.
- the decompression channel 225 is formed by a groove that is recessed from the bottom surface of the dripper body 221.
- the planar shape of the decompression channel 225 is the same as the planar shape of the decompression channel 125.
- the connecting portion 2213 is a portion other than both ends of the communication channel 226 having a rectangular planar shape, and has an open portion 2216 that is open to the internal space of the tube 110, and the bottom surface of the connecting portion 2213. Except for the point that a shape is a rectangle, it is comprised similarly to the connection part 1213.
- the opening 2216 is formed by a slit (slit) that penetrates the connecting portion 2213 in the thickness direction of the connecting portion 2213.
- the planar shape of the opening 2216 is a rectangle.
- the width (length in the Y direction) of the communication channel 226 and the open part 2216 is, for example, 0.5 mm.
- the movable part 222 is configured in the same manner as the movable part 122 except for the protrusion 2224.
- the planar shape of the protrusion 2224 is the same as the planar shape of the opening 2216 as shown in FIG. 10C.
- the projection 2224 closes the opening 2216 from above and partially fits into the opening 2216, thereby forming a communication channel 226 that connects the decompression channel 225 and the discharge unit 126.
- FIG. 11A is a diagram schematically showing a cross-section along the line AA in FIG. 10C of the dripper according to the present embodiment before the movable part moves
- FIG. 11B shows the movable part moving
- FIG. 10D is a diagram schematically showing a cross section of the dripper after being taken along the line AA in FIG. 10C.
- the movable portion 222 moves forward and backward with respect to the bottom surface side of the dripper 220 by sliding the opening portion 2216 at a moving distance corresponding to the pressure received by the pressure receiving portion 1221.
- the height (cross-sectional area) of the communication channel 226 is changed in the range of h 0 to h 1 , for example, in the range of 0.25 to 0.75 mm.
- This embodiment has the same effect as the first embodiment. Furthermore, since the dripper 220 according to the present embodiment further includes a communication channel, the channel formed by the dripper 220 has a simpler shape than the decompression channel, and the channel is disconnected. The area can be changed. For this reason, the planar shape of the protrusion 2224 of the movable part 222 can be made simpler. Therefore, this embodiment is more effective from the viewpoint of simplifying the manufacture of the movable part 222 and the assembly of the dripper 220.
- Embodiment 3 This embodiment is the same as Embodiment 1 described above, except that the decompression flow path is different.
- the dripper according to the present embodiment is different from the first embodiment in that the movable part moves in the width direction of the decompression flow path to change the cross-sectional area of the decompression flow path.
- symbol is used and description is abbreviate
- FIG. 12A is a diagram showing a plane, a front surface, and a side surface of the dripper according to the present embodiment
- FIG. 12B is a diagram showing a bottom surface, a front surface, and a side surface of the dripper.
- FIG. 13A is a bottom view of the dripper according to Embodiment 3
- FIG. 13B is a diagram schematically showing a cross section of the dripper along the line AA in FIG. 13A.
- the dripper 320 includes a dripper main body 321 and a movable portion 322.
- the dripper 320 includes a decompression channel 325.
- the shape of the decompression flow path 325 when viewed in the Y direction is a zigzag shape.
- the zigzag shape is the same as the planar shape of the decompression flow path 125 in the first embodiment.
- FIG. 14A is a plan view of the dripper body in the present embodiment
- FIG. 14B is a front view of the dripper body
- FIG. 14C is a bottom view of the dripper body
- FIG. 14D is the dripper body.
- the dripper main body 321 has a first end portion 1211, a second end portion 1212, and a connecting portion 3213.
- the connection part 3213 includes an opening part 3216.
- the opening 3216 is a bottomed groove having a rectangular planar shape.
- the shape of the bottom surface of the opening 3216 is a shape in which a plurality of substantially triangular prism-shaped convex portions are arranged at regular intervals in the X direction.
- the width (length in the Y direction) of the opening 3216 is, for example, 0.5 mm.
- FIG. 15A is a plan view of the movable part in the present embodiment
- FIG. 15B is a front view of the movable part
- FIG. 15C is a bottom view of the movable part
- FIG. 15D is the movable part.
- the movable part 322 is configured in the same manner as the movable part 122 in Embodiment 1 except for the protrusion 3224.
- the planar shape of the protrusion 3224 is a rectangle that is the same as the planar shape of the opening 3216, as shown in FIG. 15C.
- the thickness (length in the Y direction) of the protrusion 3224 is, for example, 0.49 mm.
- the shape of the protruding edge of the protrusion 3224 is a shape in which a plurality of convex portions having a substantially triangular prism shape are arranged at regular intervals in the X direction.
- the convex portion of the protrusion 3224 is formed so as to be positioned between the two convex portions in the opening portion 3216 in the X direction when the movable portion 322 is disposed on the dripper body 321.
- the projection 3224 closes the opening part 3216 from above and partially fits into the opening part 3216.
- the convex portions in the open portion 3216 and the convex portions in the protrusion 3224 are alternately arranged in the X direction to form the zigzag-shaped decompression flow path 325, and the dripper 320 is configured (FIG. 13B).
- FIG. 16A is a diagram schematically showing a cross section along the line AA in FIG. 13C of the dripper according to Embodiment 3 before the movable part moves
- FIG. 16B shows the movement of the movable part
- FIG. 13D is a diagram schematically showing a cross section of the dripper after being taken along the line AA in FIG. 13C.
- the movable part 322 does not move as shown in FIG. 16A.
- the width w 0 of the decompression channel 325 is 0.5 mm, for example, and the sectional area of the decompression channel 325 is the largest.
- the width of the decompression flow path 325 is a distance between inclined surfaces parallel to each other among the inclined surface of the convex portion of the connecting portion 3213 and the inclined surface of the convex portion of the movable portion 322.
- the movable part 322 When the pressure receiving part 1221 receives a sufficient pressure, the movable part 322 is urged toward the bottom side of the dripper 320 and moves to the bottom side as shown in FIG. 16B.
- the protrusion 3224 further advances while sliding on the opening 3216.
- Width w 1 of the vacuum channel 325 in this case becomes smaller than the w 0, for example, 0.3 mm. In this case, the cross-sectional area of the decompression flow path 325 is the smallest.
- This embodiment has the same effect as the first embodiment. Further, in the dripper 320 according to the present embodiment, since the planar shape of the decompression channel 325 is rectangular, the assembly of the movable portion 322 to the dripper main body 321 is easier.
- the dripper 320 is expected to have an excellent self-cleaning action in the decompression channel 325 because the width of the decompression channel 325 having a zigzag shape changes. This is because the turbulence of the liquid flow in the depression between the convex portions of the decompression flow path 325 changes with the movement of the movable portion 322 (change in the width of the decompression flow path 325), so This is because an object easily flows out of the depression.
- the decompression flow path 325 is constituted only by the dripper main body 321 and the movable portion 322 without depending on the adhesion of the dripper 320 to the tube 110.
- the cross-sectional area of the decompression flow path 325 is constant regardless of the adhesion depth of the dripper 320 to the tube 110 and the ease of deformation of the tube 110. Therefore, the dripper 320 is more effective from the viewpoint of making the cross-sectional area of the decompression flow path 325 between the drippers 320 in the drip irrigation tube 100 more uniform.
- the tube 110 may be a seamless tube or a tube formed by joining elongated sheets along the longitudinal direction.
- the dripper is arranged so that the inflow portion is located upstream in the liquid flow direction in the tube.
- the dripper is arranged so that the inflow portion is located downstream. Also good.
- the above-mentioned directions of the drippers may be the same or different.
- the low-pressure stop function is given to the dripper by the dripper body material (polypropylene).
- the low-pressure stop function is directed from the opening edge on the upper surface side of the inlet toward the inner space of the tube. It is also possible to apply to the dripper by forming a protruding edge such as a protruding burr or by covering the opening end of the inlet and the inner peripheral wall surface of the inlet with a hydrophobic film.
- it is possible to further enhance the low-pressure stop function by using a plurality of methods for providing the low-pressure stop function.
- the material of the dripper main body and the material of the movable part are the same (polypropylene), but these materials may be different.
- the cross-sectional area of the channel formed in the dripper can be changed by a method other than changing the height of the decompression channel or the communication channel.
- the cross-sectional area can be changed by a rectifying plate, a baffle plate, or the like that is movable back and forth with respect to the decompression channel or the communication channel.
- the movable part is advanced and retracted with respect to the open part of the dripper body according to the pressure of the liquid in the tube by the leaf spring structure formed on the side part of the dripper.
- Other means may be used as the means for moving the sensor according to the pressure.
- the movable part may be formed of an elastic body, and the elastic body may be expanded and contracted according to the pressure to advance and retract the movable part to and from the open part.
- the present invention it is possible to easily provide a dripper capable of dripping the liquid at an appropriate speed depending on the pressure of the liquid to be dripped. Therefore, the spread of the dripper to technical fields that require long-term dripping, such as drip irrigation and durability tests, and further development of the technical field are expected.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Environmental Sciences (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
Description
図1Aは、本発明の実施の形態1に係る点滴灌漑用チューブの概略的な平面図であり、図1Bは、当該点滴灌漑用チューブの、図1AのA-A線に沿っての断面図である。
図2に示される点滴灌漑用チューブ100に液体が供給される。液体の流れる方向は、X方向である。当該液体は、凸条1201間の隙間に満たされる。ドリッパ120の上面には、長手方向(X方向)に沿って凸条1201が並列しており、凸条1201のY方向の両端と上面側凹部の側壁との間には、隙間がある。このため、液体中における落ち葉などの浮遊物がドリッパ120の上面に張り付いても、凸条1201間の隙間の全てが塞がれることはない。よって、凸条1201間における流入口123が開口する隙間には、常に液体で満たされている。このように、凸条1201は、フィルタ機能を有する。
本実施の形態は、ドリッパの構造が異なる以外は、前述した実施の形態1と同じである。本実施の形態に係るドリッパは、減圧流路と吐出部とを接続する連絡流路をさらに有する点、および、可動部が連絡流路の断面積を変化させる点、で実施の形態1と異なる。実施の形態1と同じ構成については、同じ符号を用い、説明を省略する。
本実施の形態は、減圧流路が異なる以外は、前述した実施の形態1と同じである。本実施の形態に係るドリッパは、減圧流路の幅方向に可動部が動いて減圧流路の断面積を変化させる点、で実施の形態1と異なる。実施の形態1と同じ構成については、同じ符号を用い、説明を省略する。
たとえば、チューブ110は、シームレスチューブであってもよいし、細長いシートを長手方向に沿って接合してなるチューブであってもよい。
110 チューブ
120、220、320 ドリッパ
121、221、321 ドリッパ本体
122、222、322 可動部
123 流入口
124 流入部
125、225、325 減圧流路
126 吐出部
130 貫通孔
226 連絡流路
1201 凸条
1211、2211 第1端部
1212 第2端部
1213、2213、3213 連結部
1214、1215 弾性支持部
1216、2216、3216 開放部
1221 受圧部
1222 スペーサ部
1223 係合部
1224、2224、3224 突起
Claims (5)
- チューブの壁に形成された貫通孔を覆う位置にチューブの内壁面に接着されることによって、前記チューブ内の空間および前記貫通孔を連通する流路であって、前記空間から流入した液体を前記貫通孔に向けて減圧させながら流すための減圧流路を含む流路を構成する、ドリッパであって、
前記チューブの内壁面に接着されることによって、前記空間に対して開放されている開放部を含む前記流路を構成するドリッパ本体と、
前記開放部を前記空間側から塞ぐとともに、前記空間内の前記液体の圧力に応じて前記開放部に進退可能に配置され、前記圧力に応じて前記開放部における前記流路の断面積を変化させるための可動部と、を有する、
ドリッパ。 - 前記流路は、前記空間から流入した液体が収容される流入部と、前記流入部に接続されている前記減圧流路と、前記減圧流路に接続され、減圧された前記液体が収容される吐出部と、を含み、
前記開放部は、前記減圧流路に含まれる、
請求項1に記載のドリッパ。 - 前記流路は、前記空間から流入した液体が収容される流入部と、前記流入部に接続されている前記減圧流路と、前記減圧流路に接続され、減圧された前記液体が流れる連絡流路と、前記連絡流路に接続され、減圧された前記液体が収容される吐出部と、を含み、
前記開放部は、前記連絡流路に含まれる、
請求項1に記載のドリッパ。 - 前記ドリッパ本体は、前記空間と前記流入部を連通する流入口をさらに含み、
前記流入口は、設定値以上の圧力の前記空間内の前記液体の流入を許容する低圧停止機能を有する、
請求項2または3に記載のドリッパ。 - チューブと、前記チューブの内壁面に接着された請求項1~4のいずれか一項に記載のドリッパとを有する、点滴灌漑用チューブ。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14839022.2A EP3039961B1 (en) | 2013-08-26 | 2014-08-25 | Dripper and drip irrigation tube |
ES14839022T ES2769779T3 (es) | 2013-08-26 | 2014-08-25 | Gotero y tubo de riego por goteo |
CN201480046967.1A CN105491877B (zh) | 2013-08-26 | 2014-08-25 | 滴头及滴灌用输送管 |
US14/913,902 US9894850B2 (en) | 2013-08-26 | 2014-08-25 | Dripper and drip irrigation tube |
IL244291A IL244291B (en) | 2013-08-26 | 2016-02-25 | Dropper and hose for drip irrigation |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2013-174417 | 2013-08-26 | ||
JP2013174417 | 2013-08-26 | ||
JP2013-198306 | 2013-09-25 | ||
JP2013198306A JP6339338B2 (ja) | 2013-08-26 | 2013-09-25 | ドリッパおよび点滴灌漑用チューブ |
Publications (1)
Publication Number | Publication Date |
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WO2015029932A1 true WO2015029932A1 (ja) | 2015-03-05 |
Family
ID=52586490
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2014/072113 WO2015029932A1 (ja) | 2013-08-26 | 2014-08-25 | ドリッパおよび点滴灌漑用チューブ |
Country Status (7)
Country | Link |
---|---|
US (1) | US9894850B2 (ja) |
EP (1) | EP3039961B1 (ja) |
JP (1) | JP6339338B2 (ja) |
CN (1) | CN105491877B (ja) |
ES (1) | ES2769779T3 (ja) |
IL (1) | IL244291B (ja) |
WO (1) | WO2015029932A1 (ja) |
Cited By (1)
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CN114145216A (zh) * | 2021-11-18 | 2022-03-08 | 石河子大学 | 一种回字形对冲流道及基于该流道的灌水器 |
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ES2734387T3 (es) * | 2013-11-27 | 2019-12-05 | Enplas Corp | Emisor y tubo de riego por goteo |
EP3075233B1 (en) * | 2013-11-27 | 2019-04-24 | Enplas Corporation | Emitter and drip irrigation tube |
US10330559B2 (en) | 2014-09-11 | 2019-06-25 | Rain Bird Corporation | Methods and apparatus for checking emitter bonds in an irrigation drip line |
JP6532763B2 (ja) * | 2015-02-25 | 2019-06-19 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
JP6532757B2 (ja) | 2015-05-28 | 2019-06-19 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
JP6541220B2 (ja) * | 2015-05-28 | 2019-07-10 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
JP6532759B2 (ja) | 2015-05-29 | 2019-06-19 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
US10299444B2 (en) * | 2016-04-07 | 2019-05-28 | Amir Cohen | In line button drip emitter |
JP2017220054A (ja) * | 2016-06-08 | 2017-12-14 | 株式会社エンプラス | 流量制御装置、エミッタおよび点滴灌漑用チューブ |
JP6719297B2 (ja) * | 2016-06-29 | 2020-07-08 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
JP2018082652A (ja) * | 2016-11-22 | 2018-05-31 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
US11051466B2 (en) | 2017-01-27 | 2021-07-06 | Rain Bird Corporation | Pressure compensation members, emitters, drip line and methods relating to same |
JP2019054758A (ja) * | 2017-09-21 | 2019-04-11 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
USD883048S1 (en) * | 2017-12-12 | 2020-05-05 | Rain Bird Corporation | Emitter part |
JP7101045B2 (ja) * | 2018-05-28 | 2022-07-14 | 株式会社エンプラス | エミッタおよび点滴灌漑用チューブ |
US11985924B2 (en) | 2018-06-11 | 2024-05-21 | Rain Bird Corporation | Emitter outlet, emitter, drip line and methods relating to same |
US11497178B2 (en) | 2019-06-14 | 2022-11-15 | The Toro Company | Drip irrigation emitter with optimized clog resistance |
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Also Published As
Publication number | Publication date |
---|---|
EP3039961A4 (en) | 2017-04-05 |
JP6339338B2 (ja) | 2018-06-06 |
US9894850B2 (en) | 2018-02-20 |
JP2015062369A (ja) | 2015-04-09 |
US20160205878A1 (en) | 2016-07-21 |
ES2769779T3 (es) | 2020-06-29 |
CN105491877A (zh) | 2016-04-13 |
EP3039961B1 (en) | 2019-11-20 |
CN105491877B (zh) | 2020-07-03 |
EP3039961A1 (en) | 2016-07-06 |
IL244291A0 (en) | 2016-04-21 |
IL244291B (en) | 2020-06-30 |
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