阅读说明：本技术 发射器及滴灌用输送管 (Emitter and drip irrigation pipe ) 是由 柳泽一磨 小野好贵 于 2019-01-18 设计创作，主要内容包括：本发明的发射器包括：取水部,在发射器接合于输送管时与输送管内连通；减压流路部,用于形成使灌溉用液体一边减压一边流动的减压流路；流量调整部,用于根据输送管内的灌溉用液体的压力对灌溉用液体的流量进行调整；以及排出部,在发射器接合于输送管时面向排出口。流量调整部包括：基座；收纳基座的收纳部；连通孔,在基座开口并与排出部连通；以及隔膜部,具有挠性并且与基座间隔开配置,在受到输送管内的灌溉用液体的压力时接近基座。隔膜部是与取水部及减压流路部一体的。基座是与隔膜部、取水部及减压流路部分体的结构。(The transmitter of the present invention comprises: the water taking part is communicated with the conveying pipe when the emitter is jointed with the conveying pipe; a pressure reduction flow path section for forming a pressure reduction flow path through which the irrigation liquid flows while being reduced in pressure; a flow rate adjusting part for adjusting the flow rate of the irrigation liquid according to the pressure of the irrigation liquid in the delivery pipe; and a discharge portion facing the discharge port when the emitter is coupled to the delivery pipe. The flow rate adjusting unit includes: a base; a receiving part for receiving the base; a communication hole which is opened in the base and communicates with the discharge portion; and a diaphragm portion which is flexible and is disposed apart from the base, and which approaches the base when receiving the pressure of the irrigation liquid in the delivery pipe. The diaphragm part is integrated with the water intake part and the pressure reduction flow path part. The base is a structure separate from the diaphragm portion, the water intake portion, and the pressure reduction flow path portion.)

1. An emitter which is joined to a position corresponding to a discharge port communicating the inside and outside of a delivery pipe through which an irrigation liquid flows, and which is used for discharging the irrigation liquid in the delivery pipe from the discharge port to the outside of the delivery pipe in a fixed amount, the emitter comprising:

a water intake part which communicates with the inside of the delivery pipe when the emitter is coupled to the delivery pipe;

a pressure reduction flow path portion which communicates with the water intake portion and forms a pressure reduction flow path for flowing the irrigation liquid while reducing the pressure;

a flow rate adjusting section which is communicated with the pressure reducing flow path section and adjusts the flow rate of the irrigation liquid according to the pressure of the irrigation liquid in the delivery pipe; and

a discharge section communicating with the flow rate adjustment section and facing the discharge port when the emitter is joined to the delivery pipe,

the flow rate adjusting unit includes:

a base;

a housing section that houses the base;

a communication hole that opens in the base and communicates with the discharge portion; and

a diaphragm portion having flexibility and disposed apart from the base, approaching the base when receiving a pressure of the irrigation liquid in the delivery pipe,

the diaphragm part is integrated with the water intake part and the pressure reduction flow path part,

the base is a separate structure from the diaphragm portion, the water intake portion, and the pressure-reducing flow path portion.

2. The transmitter of claim 1, wherein,

at least the base of the base and the housing portion has a gap generating portion that generates a gap between the base and the diaphragm portion when the diaphragm portion is not subjected to pressure of the irrigation liquid in the delivery pipe.

3. The transmitter of claim 2, wherein,

the void generation section includes:

a first locking part formed in the housing part; and

and a second locking portion formed on the base and capable of locking with the first locking portion.

4. The transmitter of claim 2, wherein,

the gap generating portion has a tapered portion formed on a side surface portion of the base and gradually reduced in diameter as it approaches the diaphragm portion side.

5. The transmitter of claim 2, wherein,

the void generation section includes:

a first screw portion formed in the housing portion; and

and a second screw portion formed on a side surface portion of the base and capable of being screwed with the first screw portion.

6. The transmitter of claim 5, wherein,

the base has a holding portion for being held when the base is received in the receiving portion.

7. A drip irrigation pipe comprising:

a delivery pipe having a discharge port for discharging the irrigation liquid; and

the emitter according to any one of claims 1 to 6, which is joined to a position corresponding to the discharge port on an inner wall surface of the duct.

Technical Field

The present invention relates to an emitter and a drip irrigation pipe provided with the emitter.

Background

Conventionally, a drip irrigation method has been known as one of the methods for cultivating plants. The drip irrigation method is a method in which a drip irrigation pipe is disposed on soil in which plants are cultivated, and an irrigation liquid such as water or a liquid fertilizer is dripped from the drip irrigation pipe to the soil. In recent years, the drip irrigation method has been particularly attracting attention because it can minimize the consumption of irrigation liquid.

The drip irrigation pipe includes a pipe in which a plurality of through holes for discharging irrigation liquid are formed, and a plurality of emitters (also referred to as "emitters") joined to an inner wall surface of the pipe and for discharging irrigation liquid from the through holes (see, for example, patent document 1).

Patent document 1 describes a transmitter including a body and a wing movable relative to the body about a hinge. The tab is formed of a similar material, preferably the same material, as the body. The fin has a film (diaphragm) disposed in the frame. In an operating state in which the transmitter is assembled, the recess of the body is covered with the film of the flap rotated about the hinge. The recess is formed in the main body so as to have a rim provided in the frame case as a peripheral edge portion. The membrane of the tab is pressed against the rim, thereby forming a pressure regulating chamber. The membrane is elastically bent by the pressure fluctuation, and the flow rate of the liquid flowing out of the pressure adjustment chamber is adjusted.

Disclosure of Invention

Problems to be solved by the invention

In the transmitter described in patent document 1, the flaps are integrally formed with the body in a state where the flaps are opened. The recess formed in the body is covered with a film of the fin, thereby constituting a pressure adjustment chamber for adjusting the flow rate of the liquid discharged from the emitter. Therefore, in order to set the radiator to an operating state, a plurality of steps such as a step of rotating the fins around the hinge, and a step of engaging the rotated fins with the body by adhesion using a chemical agent, welding using heat, or the like are required. Such a plurality of steps increases the manufacturing cost of the emitter, and therefore, it is desirable to suppress the manufacturing cost. In particular, since the manufacturing cost is greatly increased by the step of engaging the flap with the body by bonding, welding, or the like, it is desirable that the emitter that performs bonding, welding, or the like is not required in the manufacturing step.

The invention aims to provide an emitter and a drip irrigation pipe which can reduce the manufacturing cost.

Means for solving the problems

An emitter according to the present invention is an emitter which is joined to a position corresponding to a discharge port communicating an inside and an outside of a delivery pipe through which an irrigation liquid flows, and which is used for discharging the irrigation liquid in the delivery pipe from the discharge port to the outside of the delivery pipe in a fixed amount, the emitter comprising: a water intake part which communicates with the inside of the delivery pipe when the emitter is coupled to the delivery pipe; a pressure reduction flow path portion which communicates with the water intake portion and forms a pressure reduction flow path for flowing the irrigation liquid while reducing the pressure; a flow rate adjusting section which is communicated with the pressure reducing flow path section and adjusts the flow rate of the irrigation liquid according to the pressure of the irrigation liquid in the delivery pipe; and a discharge portion that communicates with the flow rate adjustment portion and faces the discharge port when the transmitter is joined to the delivery pipe, the flow rate adjustment portion including: a base; a housing section that houses the base; a communication hole that opens in the base and communicates with the discharge portion; and a diaphragm portion which is flexible and disposed apart from the base, and which approaches the base when receiving a pressure of the irrigation liquid in the delivery pipe, wherein the diaphragm portion is integrated with the water intake portion and the pressure reduction flow path portion, and the base is a structure separate from the diaphragm portion, the water intake portion, and the pressure reduction flow path portion.

The drip irrigation pipe of the present invention comprises: a delivery pipe having a discharge port for discharging the irrigation liquid; and a transmitter of the present invention that is joined to a position on an inner wall surface of the duct corresponding to the discharge port.

Effects of the invention

According to the present invention, an emitter and a drip irrigation pipe that can be manufactured at a reduced cost can be provided.

Drawings

Fig. 1 is a sectional view of a drip irrigation pipe according to embodiment 1 of the present invention (a sectional view taken along line a-a shown in fig. 2A including emitters).

Fig. 2A and 2B are diagrams showing the structure of a transmitter according to embodiment 1 of the present invention.

Fig. 3A to 3D are diagrams showing the structure of a base according to embodiment 1 of the present invention, and fig. 3E is a diagram showing a modification of the structure of the base.

Fig. 4A and 4B are diagrams showing a modification of the structure of the transmitter according to embodiment 1 of the present invention.

Fig. 5A and 5B are views showing modifications of the structure of the base according to embodiment 1 of the present invention.

Fig. 6A to 6C are diagrams showing the structure of the transmitter according to embodiment 2 of the present invention.

Fig. 7A to 7C are diagrams showing the structure of the emitter according to embodiment 2 in the manufacturing process.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[ embodiment 1]

(drip irrigation pipe and emitter structure)

Fig. 1 is a sectional view along the axial direction of a drip irrigation pipe 100 according to embodiment 1. As shown in fig. 1, the drip irrigation pipe 100 includes a pipe 110 and an emitter 120.

The delivery pipe 110 is a pipe for flowing irrigation liquid. Examples of irrigation liquids include: water, liquid fertilizer, pesticide and their mixture. In the delivery pipe 110, the direction in which the irrigation liquid is made to flow is not particularly limited. In addition, the material of the delivery pipe 110 is not particularly limited. In the present embodiment, the material of the transport pipe 110 is polyethylene.

A plurality of discharge ports 111 for discharging irrigation liquid are formed at predetermined intervals (for example, 200mm to 500 mm) in the axial direction of the delivery pipe 110 on the pipe wall of the delivery pipe 110. The diameter of the opening of the discharge port 111 is not particularly limited as long as the irrigation liquid can be discharged. In the present embodiment, the diameter of the opening of the discharge port 111 is 1.5 mm. The emitters 120 are respectively joined to positions of the inner wall surface 112 corresponding to the discharge ports 111. The shape of the cross section perpendicular to the axial direction of the transport pipe 110 and the area of the cross section are not particularly limited as long as the emitter 120 can be disposed inside the transport pipe 110.

The drip irrigation pipe 100 is manufactured by joining the rear surface 121 of the emitter 120 to the inner wall surface 112. The coupling method of the delivery tube 110 and the emitter 120 is not particularly limited. Examples of the coupling method of the delivery tube 110 and the emitter 120 include: welding of resin materials constituting the duct 110 or the emitter 120, or bonding with an adhesive. In the present embodiment, the discharge port 111 is formed after the delivery pipe 110 and the emitter 120 are joined, but the discharge port 111 may be formed before the joining.

Fig. 2A and 2B are diagrams showing the structure of the transmitter 120 according to embodiment 1. Fig. 2A is a top view of the emitter 120, and fig. 2B is a bottom view of the emitter 120. Fig. 2B shows the transmitter 120 (hereinafter also referred to as "transmitter main body") in a state where the base 190 is detached.

As shown in fig. 1, the emitter 120 is joined to the inner wall surface 112 of the delivery pipe 110 so as to cover the discharge port 111. The shape of the emitter 120 is not particularly limited as long as it can closely contact the inner wall surface 112 and cover the discharge port 111. In the present embodiment, the shape of the back surface of the radiator 120, which is joined to the inner wall surface 112 in a cross section perpendicular to the axial direction of the delivery pipe 110, is a substantially circular arc shape that is convex toward the inner wall surface 112 so as to follow the inner wall surface 112. The emitter 120 has a substantially rectangular shape with four corners rounded off by R as shown in fig. 2A. In the present embodiment, the emitter 120 has a length of 19mm in the longitudinal direction, a length of 8mm in the short-side direction, and a height of 2.7 mm. The size of the emitter 120 is not particularly limited, and may be appropriately determined based on the amount of irrigation liquid desired to be discharged from the discharge port 111.

In the present embodiment, the emitter 120 is molded from a material having flexibility. Among the components constituting the transmitter 120, a base 190, which will be described later, is a separate component from the other components (transmitter body). Examples of the material of the emitter 120 include: resins, elastomers and rubbers. Examples of the resin include: polyethylene and silicone. The flexibility of the transmitter 120 can be adjusted by using a resin material having elasticity. Examples of the adjustment method of the flexibility of the transmitter 120 include: selecting a resin having elasticity, adjusting the mixing ratio of a resin material having elasticity to a hard resin material, and the like. The emitter body and the base 190 may be formed of the same material or may be formed of different materials.

As shown in fig. 1, 2A, and 2B, the transmitter 120 includes: the water intake unit 150, the first connection groove 131 serving as the first connection channel 141, the first decompression groove 132 serving as the first decompression channel 142, the second connection groove 134 serving as the second connection channel 144, the second decompression groove 135 serving as the second decompression channel 145, the third connection groove 136 serving as the third connection channel 146, the discharge unit 180, the storage unit 181, and the base 190. The discharge unit 180 is formed by housing the base 190 in the housing unit 181. In the following description, the surface of the emitter 120 shown in fig. 2A is referred to as a front surface 122, and the surface shown in fig. 2B is referred to as a rear surface 121. The first connection groove 131, the first decompression groove 132, the second connection groove 134, the second decompression groove 135, the third connection groove 136, and the receiving portion 181 are disposed on the rear surface 121 side of the emitter main body.

By joining the radiator 120 to the duct 110, the first connection groove 131, the first decompression groove 132, the second connection groove 134, the second decompression groove 135, and the third connection groove 136 become a first connection passage 141, a first decompression passage 142, a second connection passage 144, a second decompression passage 145, and a third connection passage 146, respectively. This forms a flow path including the water intake unit 150, the first connection flow path 141, the first decompression flow path 142, the second connection flow path 144, the second decompression flow path 145, the third connection flow path 146, and the storage unit 181, and connecting the water intake unit 150 and the storage unit 181. The channel allows the irrigation liquid to flow from the water intake unit 150 to the storage unit 181.

The water intake unit 150 is disposed in plurality along the longitudinal direction of the emitter 120. In the present embodiment, five water intake portions 150 are disposed at a distance from each other at one outer edge portion of the emitter 120 in the short axis direction (see fig. 2A and 2B). As shown in fig. 2A and 2B, the water intake part 150 is a water intake through hole that penetrates from the front surface 122 to the back surface 121 of the emitter 120. When the emitter 120 is joined to the inner wall surface 112 of the delivery pipe 110, the irrigation liquid in the delivery pipe 110 is introduced from the water intake part 150 into the emitter 120.

The position of the water intake unit 150 is not limited to this, and may be provided at a distance from each other at outer edge portions on both sides of the emitter 120 in the short axis direction, for example. The number of water intake units 150 is not limited to five, and may be more or less than five.

Although not shown, the water intake unit 150 may have a mesh member or the like for preventing suspended matter in the irrigation liquid from entering the emitter 120. The shape of the mesh member is not particularly limited as long as the mesh member can exhibit the above-described functions. For example, the screen member has a mesh structure or a Wedge Wire (Wedge Wire) structure. Here, the "lattice structure" refers to a structure in which a plurality of linear members arranged in parallel with each other are set as a set, and the plurality of sets are stacked so that the linear members in each set extend in different directions. The height direction positions of the respective sets may be different from each other or the same. The "wedge line structure" includes a plurality of linear members arranged in parallel with each other, and the interval between the linear members gradually increases from the outer side to the inner side of the transmitter 120. Thus, if the screen member is configured to have a wedge-shaped wire structure, it is possible to prevent the suspended matter in the irrigation liquid from entering the emitter 120 and to suppress the pressure loss of the irrigation liquid flowing into the water intake unit 150.

The first connecting groove 131 connects the water intake unit 150 to the first pressure-reducing groove 132 (first pressure-reducing channel 142). The first connection groove 131 is a groove formed linearly along the minor axis direction of the emitter 120 on the back surface 121 of the emitter 120. The upstream end of the first connecting groove 131 is connected to the water intake unit 150, and the downstream end is connected to the first pressure-reducing groove 132. When the delivery pipe 110 and the radiator 120 are joined, a first connection flow path 141 is formed by the first connection groove 131 and the inner wall surface 112 of the delivery pipe 110. The irrigation liquid introduced from the water intake unit 150 flows through the first connection channel 141 to the first pressure-reducing channel 142.

The first pressure reducing groove 132 connects the first connection groove 131 (first connection passage 141) and the second connection groove 134 (second connection passage 144). The first decompression groove 132 decompresses the pressure of the irrigation liquid introduced from the water intake part 150 and guides to the second connection groove 134. In the present embodiment, the first pressure-reducing groove 132 is a groove disposed along the longitudinal direction in the central portion of the back surface 121. The upstream end of the first decompression groove 132 is connected to the first connection groove 131, and the downstream end is connected to the second connection groove 134. The first pressure-reducing groove 132 has a zigzag shape in plan view.

In the first pressure-reducing groove 132, a plurality of convex portions 133 alternately protrude from the inner surfaces on both sides in the flow direction of the irrigation liquid in the first pressure-reducing flow path 142 (see fig. 2B). Preferably, the plurality of projections 133 project from the inner surface of the first pressure-reducing groove 132 such that the tip of the projection 133 does not exceed the center line L of the first pressure-reducing groove 132 when the radiator 120 is viewed in plan (see fig. 2B). When the delivery tube 110 and the radiator 120 are joined, a first decompression channel 142 is formed by the first decompression groove 132 and the inner wall surface 112 of the delivery tube 110. The irrigation liquid introduced from the water intake unit 150 is decompressed by the first decompression passage 142 and is guided to the second connection passage 144.

The second connection groove 134 connects the first pressure-reducing groove 132 (first pressure-reducing channel 142) and the second pressure-reducing groove 135 (second pressure-reducing channel 145). The second connection groove 134 is a groove formed linearly along the minor axis direction of the emitter 120 at the rear surface 121. The upstream end of the second connecting groove 134 is connected to the first decompression groove 132, and the downstream end is connected to the second decompression groove 135. When the duct 110 and the radiator 120 are joined, a second connection flow path 144 is formed by the second connection groove 134 and the inner wall surface 112 of the duct 110. The irrigation liquid decompressed by the first decompression flow path 142 flows to the second decompression flow path 145 through the second connection flow path 144.

The second pressure reducing groove 135 connects the second connection groove 134 (second connection passage 144) and the third connection groove 136 (third connection passage 146). The second pressure reduction groove 135 reduces the pressure of the irrigation liquid flowing from the second connection channel 144, and guides the pressure reduced irrigation liquid to the third connection groove 136. In the present embodiment, the second pressure-reducing groove 135 is a groove disposed along the long axis direction at one outer edge portion of the rear surface 121 in the short axis direction of the emitter 120. An upstream end of the second decompression groove 135 is connected to the second connection groove 134, and a downstream end thereof is connected to the third connection groove 136. The plan view of the second pressure-reducing groove 135 is a zigzag shape.

In the second pressure-reducing tank 135, a plurality of convex portions 133 alternately protrude from the inner surfaces on both sides in the flow direction of the irrigation liquid in the second pressure-reducing flow path 145 (see fig. 2B). Preferably, the plurality of projections 133 project from the inner surface of the second pressure-reducing groove 135 such that the tip of the projection 133 does not exceed the center line L of the second pressure-reducing groove 135 when the radiator 120 is viewed in plan (see fig. 2B). When the duct 110 and the radiator 120 are joined, a second decompression passage 145 is formed by the second decompression groove 135 and the inner wall surface 112 of the duct 110. The irrigation liquid flowing from the second connection channel 144 is decompressed by the second decompression channel 145 and guided to the third connection channel 146.

The third connection groove 136 connects the second pressure-reducing groove 135 (second pressure-reducing flow path 145) to the housing portion 181. The third connection groove 136 is a groove formed linearly along the long axis direction of the emitter 120 on the rear surface 121. The third connecting groove 136 has an upstream end connected to the second decompression groove 135 and a downstream end connected to the receiving portion 181. When the duct 110 and the radiator 120 are joined, a third connecting flow path 146 is formed by the third connecting groove 136 and the inner wall surface 112 of the duct 110. The irrigation liquid decompressed by the second decompression flow path 145 flows to the housing portion 181 through the third connection flow path 146.

The receiving portion 181 is a substantially cylindrical recess. In the housing unit 181, a base 190 (see fig. 1) is disposed to adjust the amount of the irrigation liquid flowing from the third connection channel 146 and discharged from the discharge port 111 of the delivery pipe 110. After the susceptor 190 is disposed in the housing portion 181, the emitter 120 is joined to the inner wall surface 112 of the delivery pipe 110.

As shown in fig. 1, the base 190 is a substantially cylindrical member whose upper portion is mostly enclosed. Fig. 3A is a top view of the base 190, fig. 3B is a bottom view of the base 190, fig. 3C is a front view of the base 190, and fig. 3D is a right side view of the base 190.

The base 190 has: a communication hole 192 opened at a central portion of the upper surface 191 and communicating with the discharge portion 180 (refer to fig. 1) facing the discharge port 111 of the delivery tube 110 when the emitter 120 is coupled to the delivery tube 110; a communication groove 193 communicating an outer edge of the upper surface 191 with the communication hole 192 at the upper surface 191; a substantially quadrangular prism-shaped protrusion 194 (corresponding to the "second locking portion" of the present invention) protruding from the side surface of the base 190. The protruding portion 194 of the base 190 is configured to be lockable to a part of the third connecting groove 136 of the emitter main body on the side of the receiving portion 181 (corresponding to the "first locking portion formed in the receiving portion" in the present invention). The base 190 is disposed in the receiving portion 181 such that the protruding portion 194 is locked to a portion of the third connecting groove 136 on the receiving portion 181 side.

The base 190 is formed as a separate body from the other structures of the emitter 120 (the emitter body including the water intake portion 150, the first and second pressure reducing channels 142, 145, the diaphragm portion 182 described later, and the like). The base 190 is manufactured, for example, by injection molding.

As shown in fig. 1, when the emitter 120 is joined to the inner wall surface 112 of the delivery pipe 110, the base 190 disposed in the housing portion 181 and the diaphragm portion 182 provided so as to face the upper surface 191 of the base 190 constitute a flow rate adjusting portion for adjusting the flow rate of the irrigation liquid discharged from the communication hole 192 of the emitter 120 (base 190) in accordance with the pressure of the irrigation liquid in the delivery pipe 110. As shown in fig. 2A and 2B, in the present embodiment, the diaphragm portion 182 is circular in a plan view, but the shape of the diaphragm portion 182 is not particularly limited in the present invention. In the present embodiment, the diaphragm portion 182 is integrally molded with the other structure of the emitter 120 (emitter main body including the water intake portion 150, the first and second pressure reduction channels 142, 145, and the like) other than the base 190. The emitter body including the diaphragm portion 182 is manufactured, for example, by injection molding.

The diaphragm portion 182 is flexible because it is integrally molded with the emitter body. In a state where the emitter 120 is joined to the inner wall surface 112 of the delivery pipe 110, the diaphragm portion 182 is deformed toward the upper surface 191 of the base 190 by the pressure of the irrigation liquid in the delivery pipe 110.

Next, the operation of the diaphragm portion 182 according to the pressure of the irrigation liquid in the delivery pipe 110 will be described.

Since the pressure of the irrigation liquid is not applied to the diaphragm portion 182 before the irrigation liquid is fed into the feed pipe 110, the diaphragm portion 182 is not deformed (see fig. 1).

When the supply of the irrigation liquid into the delivery pipe 110 is started, the pressure of the irrigation liquid in the delivery pipe 110 starts to rise, and the diaphragm portion 182 starts to deform. When the pressure of the irrigation liquid is relatively low, the diaphragm portion 182 is less deformed, and the diaphragm portion 182 does not contact the upper surface 191 of the base 190. In this state, since the communication hole 192 of the base 190 is not closed, the irrigation liquid flowing from the third connection flow path 146 to the space 199 (see fig. 1) between the diaphragm portion 182 and the upper surface 191 of the base 190 is discharged from the communication hole 192 to the discharge portion 180. Since the distance between the diaphragm portion 182 and the upper surface 191 of the base 190 becomes narrower as the pressure of the irrigation liquid increases, the flow rate of the irrigation liquid discharged from the communication hole 192 to the discharge portion 180 is maintained within a certain range even if the pressure of the irrigation liquid increases.

When the pressure of the irrigation liquid exceeds the set value, the amount of deformation of the diaphragm portion 182 increases further, and the diaphragm portion 182 comes into close contact with the upper surface 191 of the base 190. However, even when the diaphragm portion 182 is in close contact with the upper surface 191 of the base 190, the communication groove 193 of the base 190 is not closed. Therefore, the irrigation liquid flowing from the third connecting channel 146 to the space 199 flows through the communication groove 193 and is discharged from the communication hole 192 to the discharge unit 180. Accordingly, even when the diaphragm portion 182 is in close contact with the upper surface 191 of the base 190, a certain amount of the irrigation liquid is discharged to the discharge portion 180.

With this configuration, the flow rate of the irrigation liquid discharged from the communication hole 192 can be maintained within a certain range regardless of the pressure of the irrigation liquid in the delivery pipe 110. That is, the drip irrigation pipe 100 of the present embodiment can discharge the irrigation liquid out of the pipe 110 at a predetermined flow rate regardless of whether the pressure of the irrigation liquid is low or high.

The width of the communication groove 193 is not particularly limited. For example, the width of the communication groove 193 may be determined based on the flow rate of the irrigation liquid to be discharged from the communication hole 192 when the pressure of the irrigation liquid exceeds a set value.

In the present embodiment, before the transmitter 120 is joined to the inner wall surface 112 of the transmission pipe 110, the base 190 is disposed in the housing portion 181 such that the protruding portion 194 of the base 190 is locked to a portion of the housing portion 181 side of the third connecting groove 136 of the transmitter main body. This makes it possible to position the base 190 in the height direction and the circumferential direction of the housing 181, and further, to ensure that a certain amount of clearance is present between the upper surface 191 of the base 190 and the diaphragm 182 when the diaphragm 182 is not subjected to the pressure of the irrigation liquid in the delivery pipe 110. The protruding portion 194 and a part of the third connecting groove 136 on the side of the receiving portion 181 function as a "gap generating portion that generates a gap between the base and the diaphragm portion" in the present invention.

(Effect)

As described above, the transmitter 120 of the present embodiment includes: a water intake part 150 communicating with the inside of the delivery pipe 110 when the emitter 120 is coupled to the delivery pipe 110; a pressure reduction flow path section (first pressure reduction groove 132 and second pressure reduction groove 135) for forming a pressure reduction flow path (first pressure reduction flow path 142 and second pressure reduction flow path 145) for flowing the irrigation liquid while reducing the pressure; a flow rate adjusting unit (base 190, diaphragm unit 182) for adjusting the flow rate of the irrigation liquid according to the pressure of the irrigation liquid in the delivery pipe 110; and a discharge portion 180 facing the discharge port 111 when the emitter 120 is coupled to the delivery pipe 110. The flow rate adjusting unit includes: a base 190; a receiving portion 181 that receives the base 190; a communication hole 192 that opens in the base 190 and communicates with the discharge unit 180; and a diaphragm portion 182 that is flexible and disposed apart from the base 190 and approaches the base 190 when receiving the pressure of the irrigation liquid in the delivery pipe 110. The diaphragm portion 182 is integrated with the water intake portion 150 and the pressure reducing flow path portion. The base 190 is a separate structure from the diaphragm portion 182, the water intake portion 150, and the pressure reduction flow path portion.

With such a configuration, the emitter 120 of the present embodiment can be manufactured at a reduced cost compared to a conventional case where, for example, the diaphragm portion is formed by integrally molding the vane movable with respect to the emitter body with the emitter body, rotating the vane about the hinge, and then joining the vane to the emitter body by bonding or welding. Specifically, the step of rotating the fins and the step of joining the fins to the radiator body by bonding or welding can be omitted, and therefore, the manufacturing cost can be reduced accordingly.

In addition, in the present embodiment, the base 190 is not bonded to the emitter main body (the housing portion 181) by bonding or welding, but the emitter 120 can be bonded to the inner wall surface 112 of the carrier pipe 110 by a simple process of disposing the base 190 in the housing portion 181, so that the manufacturing cost can be reduced as compared with a case where the base 190 is bonded to the emitter main body (the housing portion 181) by bonding or welding. Even if there is a gap between the inner surface of the housing portion 181 and the outer surface of the susceptor 190 after the susceptor 190 is disposed in the housing portion 181, the melted delivery pipe 110 fills the gap in the step of joining the emitter 120 to the inner wall surface 112 of the delivery pipe 110 to seal the gap, thereby functioning as a flow rate adjustment portion.

In the present embodiment, before the transmitter 120 is joined to the inner wall surface 112 of the transmission pipe 110, the base 190 is disposed in the housing portion 181 such that the protruding portion 194 of the base 190 is locked to a part of the third connecting groove 136 of the transmitter body. This makes it possible to position the base 190 in the height direction and the circumferential direction of the housing 181, and further, to ensure that a certain amount of clearance is present between the upper surface 191 of the base 190 and the diaphragm portion 182 when the diaphragm portion 182 is not subjected to the pressure of the irrigation liquid in the delivery pipe 110, thereby making it possible to function as a flow rate adjustment portion.

That is, in the present embodiment, the base 190 is not bonded to the emitter main body (the housing portion 181) by bonding or welding, but the emitter 120 can be bonded to the inner wall surface 112 of the carrier pipe 110 by a simple process of disposing the base 190 in the housing portion 181, so that the manufacturing cost can be reduced as compared with a case where the base 190 is bonded to the emitter main body (the housing portion 181) by bonding or welding and the above-described gap is secured.

(first modification)

In the above-described embodiment, the example in which the positioning of the base 190 in the height direction of the housing 181 is performed by disposing the base 190 in the housing 181 such that the protruding portion 194 of the base 190 is locked to a part of the third connection groove 136 of the transmitter main body has been described, but the present invention is not limited thereto. For example, as shown in fig. 3E, the base 190 may have a tapered portion 195 (corresponding to the "gap generating portion" of the present invention) formed on a side surface thereof in the following manner: in a state where the base 190 is disposed in place, the tapered portion 195 gradually decreases in diameter as it approaches the diaphragm portion 182 side. According to this configuration, the positioning of the base 190 in the height direction of the housing portion 181 can be performed, and further, when the diaphragm portion 182 is not subjected to the pressure of the irrigation liquid in the delivery pipe 110, a certain amount of clearance can be ensured more reliably between the upper surface 191 of the base 190 and the diaphragm portion 182. In the configuration shown in fig. 3E, the base 190 has both the protruding portion 194 and the tapered portion 195, but may have only the tapered portion 195.

(second modification)

The positioning of the base 190 in the height direction of the housing portion 181 may be performed by a configuration different from that of the first modification. Fig. 4A and 4B are diagrams showing a modification of the structure of the transmitter 120 according to the embodiment of the present invention. Fig. 4A is a top view of the emitter 120, and fig. 4B is a bottom view of the emitter 120. The transmitter 120 (transmitter body) is shown in fig. 4B with the base 190 removed. Fig. 5A and 5B are views showing modifications of the structure of the base 190 according to the embodiment of the present invention. Fig. 5A is a top view of the base 190, and fig. 5B is a bottom view of the base 190. As shown in fig. 4A and 4B, a threaded portion 183 (corresponding to the "first threaded portion" of the present invention) is formed on the inner surface of the receiving portion 181. As shown in fig. 5A and 5B, a screw portion 197 (corresponding to the "second screw portion" of the present invention) that can be screwed into the screw portion 183 is formed on the outer surface of the base 190. Before the transmitter 120 is joined to the inner wall surface 112 of the transmission pipe 110, the base 190 is disposed in the housing portion 181 by rotating the screw portion 183 and the screw portion 197 from the rear surface 121 side of the transmitter 120 so as to be screwed together. According to this configuration, the positioning of the base 190 in the height direction of the housing portion 181 can be performed, and further, when the diaphragm portion 182 is not subjected to the pressure of the irrigation liquid in the delivery pipe 110, a certain amount of clearance can be ensured between the upper surface 191 of the base 190 and the diaphragm portion 182. In the configuration shown in fig. 5B, from the viewpoint of facilitating holding (holding) of the base 190 when rotating the base 190, the base 190 has two holding portions 196 protruding from the outer edge thereof toward the communication hole 192 and adapted to be held (held) when housing the base 190 in the housing portion 181.

[ embodiment 2]