JP6362258B2 - Agricultural chemical supply equipment - Google Patents

Agricultural chemical supply equipment Download PDF

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JP6362258B2
JP6362258B2 JP2014116756A JP2014116756A JP6362258B2 JP 6362258 B2 JP6362258 B2 JP 6362258B2 JP 2014116756 A JP2014116756 A JP 2014116756A JP 2014116756 A JP2014116756 A JP 2014116756A JP 6362258 B2 JP6362258 B2 JP 6362258B2
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chemical solution
outer cylinder
negative pressure
cylindrical body
chemical
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JP2015228830A (en
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勉 守屋
勉 守屋
輝彦 神林
輝彦 神林
昌裕 市川
昌裕 市川
良明 古内
良明 古内
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勉 守屋
勉 守屋
輝彦 神林
輝彦 神林
昌裕 市川
昌裕 市川
良明 古内
良明 古内
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本発明は農業用薬液供給装置に係り、特に灌漑用の給水配管を有する圃場等において給水管路の一部に介装接続されて管路の給水中に肥料、農薬等の薬液を供給し、これらを水と混合して作物に施用する農業用薬液供給装置に関する。   The present invention relates to an agricultural chemical solution supply apparatus, and in particular, supplies a chemical solution such as fertilizer and agricultural chemical to the water supply of the pipe line connected to a part of the water supply pipe line in a farm or the like having a water supply pipe for irrigation, The present invention relates to an agricultural chemical supply apparatus that mixes these with water and applies them to crops.

圃場等の作物に施用する肥料や農薬(以下薬液という)は所定濃度の溶液として供給することが望ましいが、圃場に灌漑用の給水配管系が設けられている場合には配管の途中に薬液の混合供給管を介装接続しておくことにより給水配管の水流中にこれらの薬液を混合し水によって均一な濃度に希釈された薬液を灌水作業と同時に対象区域の作物に供給することができる。   It is desirable to supply fertilizers and pesticides (hereinafter referred to as “chemical solutions”) applied to crops in the field as a solution of a predetermined concentration. However, if a water supply piping system for irrigation is provided in the field, the chemical solution is By interposing and connecting the mixed supply pipe, it is possible to supply these chemical solutions mixed in the water flow of the water supply pipe and diluted to a uniform concentration with water to the crop in the target area simultaneously with the irrigation operation.

この場合配水管路の薬液供給装置を設ける部分の管路をオリフィス形状に絞って流路の断面積を減少させ、このオリフィス部分に外部からの薬液供給管を接続して薬液を吸入混合するいわゆるベンチュリー方式の薬液供給装置が近年用いられている。   In this case, the portion of the water distribution pipe where the chemical solution supply device is provided is narrowed to an orifice shape to reduce the cross-sectional area of the flow path, and a chemical solution supply pipe from the outside is connected to this orifice portion to soak and mix the chemical solution. Venturi type chemical supply devices have been used in recent years.

この装置では管路の上流側から供給される水流がオリフィスで絞られて速度が増大する際にこの部分の圧力が低下して負圧を生じ、これによって薬液供給管からの薬液を吸引するようになされている。このような薬液供給装置では薬液供給のためのポンプ等の動力を必要とせず可動部がないので構造が簡単で作業や保守の労力が軽減されるため近年次第に実用化されている(特許文献1 特開平9−248079)
In this apparatus, when the flow of water supplied from the upstream side of the pipe is throttled by the orifice and the speed increases, the pressure in this portion decreases and negative pressure is generated, thereby sucking the chemical from the chemical supply pipe. Has been made. Such a chemical solution supply apparatus does not require power such as a pump for supplying a chemical solution and does not have a movable part. Therefore, the structure is simple and labor and maintenance are reduced. (Japanese Patent Laid-Open No. 9-248079)

特開平9−248079号公報Japanese Patent Laid-Open No. 9-248079

このような薬液供給装置では、水中に混合される薬液の流量(濃度)は専ら給水管路のオリフィス部分に形成される負圧によって与えられるので、供給源(水道元栓など)の水圧が変動すると混合される薬液の濃度も変化する。特に管路の水圧が低下した場合には薬液の吸引混合量が大幅に減少するため一定時間の灌水作業の間に所定量の薬液が供給されない場合が生じる。   In such a chemical solution supply device, the flow rate (concentration) of the chemical solution mixed in the water is given solely by the negative pressure formed in the orifice part of the water supply pipe line, so that the water pressure of the supply source (such as a water main plug) fluctuates. The concentration of the chemical solution to be mixed also changes. In particular, when the water pressure in the pipe line decreases, the amount of the chemical solution sucked and mixed significantly decreases, so that a predetermined amount of the chemical solution may not be supplied during the irrigation operation for a predetermined time.

したがってこのような用途に用いられる薬液供給装置としては、負圧によって薬液を管路オリフィス部の水流に吸引して混合する際に前記ベンチュリー効果を極力円滑に生じさせる構造とし、給水管路の水圧が低下した場合にも充分対応できるようにすることが望まれる。   Therefore, the chemical solution supply device used for such an application has a structure that causes the Venturi effect to occur as smoothly as possible when the chemical solution is sucked and mixed into the water flow of the pipe orifice portion by negative pressure, and the water pressure of the water supply pipe line It is desirable to be able to cope with a decrease in the temperature.

ここで薬液供給装置は圃場の灌漑水配管の一部に薬液供給のために設けれている部材であり、使用する薬液による腐食および自然条件(降雨、塩害、紫外線照射等)による経時劣化を生じるので基本的には所定期間での交換が必要となる消耗部品と考えられる。このため薬液供給装置はその構造が簡単でかつ製作の容易な低コストのものであることが求められる。   Here, the chemical solution supply device is a member provided for supplying chemical solution to a part of the irrigation water piping in the field, and causes deterioration due to corrosion due to the chemical solution used and natural conditions (rainfall, salt damage, ultraviolet irradiation, etc.) Therefore, it is basically considered a consumable part that needs to be replaced in a predetermined period. Therefore, the chemical solution supply device is required to have a simple structure and a low-cost device that is easy to manufacture.

前記特許文献1には薬液流入量の調節のための機構が開示されているが構造が複雑であり、またオリフィス部自体についてベンチュリー作用をより効果的に与える構造は何ら示唆されていない。   Patent Document 1 discloses a mechanism for adjusting the inflow amount of a chemical solution, but the structure is complicated, and no structure that effectively provides a venturi action for the orifice portion itself is suggested.

本発明は、灌漑用の給水配管に介装され、給水配管に接続される上流側端部および下流側端部を有する外筒体と、前記外筒体の上流側端部の内周側に組合される内筒体とを備え、当該外筒体と内筒体との間の流路に断面積を減少させることにより水流の速度を増大させて負圧を生じさせる負圧室が形成され、前記外筒体の周壁には、一方の端部で外部の薬液容器に連通し、他方の端部で前記流路の負圧室に開口する薬液の流入孔が形成された農業用薬液供給装置において、前記流入孔は、外筒体の軸心に向かうにしたがい外筒体の下流端部に近づくように傾斜して形成されている。   The present invention includes an outer cylinder having an upstream end and a downstream end connected to the water supply pipe and connected to the water supply pipe, and an inner peripheral side of the upstream end of the outer cylinder. And a negative pressure chamber is formed in the flow path between the outer cylindrical body and the inner cylindrical body to reduce the cross-sectional area, thereby increasing the speed of water flow and generating negative pressure. The agricultural chemical solution supply is formed in the peripheral wall of the outer cylindrical body with a chemical solution inflow hole that communicates with an external chemical solution container at one end and opens into the negative pressure chamber of the flow path at the other end. In the apparatus, the inflow hole is formed to be inclined so as to approach the downstream end of the outer cylinder as it goes toward the axis of the outer cylinder.

また本発明においては、前記流入孔の孔軸が前記外筒体の軸線に対して傾斜する角度が55〜65度の範囲に設定されている。   Moreover, in this invention, the angle which the hole axis | shaft of the said inflow hole inclines with respect to the axis line of the said outer cylinder is set to the range of 55-65 degree | times.

また本発明においては、前記薬液供給装置中、少なくとも外筒体が熱可塑性樹脂を材料としてその一体成形により形成されている。   In the present invention, at least the outer cylinder in the chemical solution supply apparatus is formed by integral molding using a thermoplastic resin as a material.

さらに本発明においては、前記薬液供給装置の内筒体が前記外筒体の上流側端部の内周側に樹脂の材料弾性を利用した圧入によって前記外筒体に対して着脱可能に組合されている。   Furthermore, in the present invention, the inner cylinder body of the chemical solution supply device is detachably combined with the outer cylinder body by press-fitting using the material elasticity of resin on the inner peripheral side of the upstream end portion of the outer cylinder body. ing.

本発明のによれば灌漑用の給水配管に介装され、給水配管に接続される上流側端部および下流側端部を有する外筒体と、前記外筒体の上流側端部の内周側に組合される内筒体とを備え、当該外筒体と内筒体との間の流路に断面積を減少させることにより水流の速度を増大させて負圧を生じさせる負圧室が形成され、前記外筒体の周壁には、一方の端部で外部の薬液容器に連通し、他方の端部で前記流路の負圧室に開口する薬液の流入孔が形成されているので、薬液容器からの薬液が水流の速度の増大によって生じた負圧により負圧室に吸引されて給水配管中の水流と混合され外筒体の下流側端部から放出される。したがって、本発明の農業用薬液供給装置においては灌漑用の給水の際に薬液容器からの薬液を特定の動力を必要とせずに水流中に混合して圃場に供給することができる。   According to the present invention, an outer cylinder having an upstream end and a downstream end that are interposed in an irrigation water supply pipe and connected to the water supply pipe, and an inner circumference of the upstream end of the outer cylinder A negative pressure chamber for generating a negative pressure by increasing the velocity of water flow by reducing the cross-sectional area in the flow path between the outer cylinder and the inner cylinder. The peripheral wall of the outer cylindrical body is formed with a chemical liquid inflow hole that communicates with an external chemical liquid container at one end and opens into the negative pressure chamber of the flow path at the other end. The chemical solution from the chemical solution container is sucked into the negative pressure chamber by the negative pressure generated by the increase in the speed of the water flow, mixed with the water flow in the water supply pipe, and discharged from the downstream end of the outer cylinder. Therefore, in the agricultural chemical supply apparatus of the present invention, when supplying water for irrigation, the chemical solution from the chemical solution container can be mixed into the water stream and supplied to the field without requiring specific power.

前記流入孔は、外筒体の軸心に向かうにしたがい外筒体の下流端部に近づくように傾斜して形成されており、吸引孔から負圧室に供給される薬液は水流に対して円滑に吸引され効果的に混合される。この理由は必ずしも明らかでないが、吸引孔の孔軸が外筒の軸心に対してほぼ90度を開口している場合に比較して傾斜して開口する場合には薬液の吸引混合時に渦流や乱流を生じることが少なくベンチュリー作用による吸引混合効果がより促進されるためと考えられる。この傾斜角度を45〜80度の範囲とした場合は薬液の吸引圧力が著しく増大する。   The inflow hole is formed to be inclined so as to approach the downstream end of the outer cylinder as it goes toward the axial center of the outer cylinder, and the chemical liquid supplied from the suction hole to the negative pressure chamber is in response to the water flow. Smoothly sucked and mixed effectively. The reason for this is not necessarily clear, but if the hole axis of the suction hole opens at an angle of 90 degrees with respect to the axis of the outer cylinder, the vortex or It is considered that turbulent flow is hardly generated and the suction mixing effect by the venturi action is further promoted. When this inclination angle is in the range of 45 to 80 degrees, the suction pressure of the chemical solution is remarkably increased.

また本発明において、前記薬液供給装置中、少なくとも外筒体を熱可塑性樹脂の一体成形により形成すると装置を低コストで量産することができ、また薬液による経時腐食や野外の圃場に設置される場合の自然劣化が効果的に抑止される。   In the present invention, in the chemical solution supply device, if at least the outer cylinder is formed by integral molding of a thermoplastic resin, the device can be mass-produced at a low cost, and when it is corroded by a chemical solution or installed in an outdoor field Natural degradation of the is effectively suppressed.

本発明に係る薬液供給装置の側断面図である。It is side sectional drawing of the chemical | medical solution supply apparatus which concerns on this invention. 本発明に係る薬液供給装置の正面図である。It is a front view of the chemical | medical solution supply apparatus which concerns on this invention. 本発明に係る薬液供給装置の孔部に薬液供給容器の継手を接続した状態を示す側面図であるIt is a side view which shows the state which connected the coupling of the chemical | medical solution supply container to the hole of the chemical | medical solution supply apparatus which concerns on this invention.

本発明に係る農業用薬液供給装置(以降単に薬液供給装置という)1は、図1に示すように、外筒体2と、外筒体2に同心状に内蔵される内筒体3とを備えて構成されるものであり、内部には軸心O1に沿って水の流路が形成される。外筒体2および内筒体3はポリ塩化ビニル(PVC)等の熱可塑性樹脂を用いて一体成形により形成されている。   As shown in FIG. 1, an agricultural chemical supply apparatus (hereinafter simply referred to as a chemical supply apparatus) 1 according to the present invention includes an outer cylinder 2 and an inner cylinder 3 that is concentrically built in the outer cylinder 2. A water flow path is formed along the axis O1. The outer cylinder 2 and the inner cylinder 3 are formed by integral molding using a thermoplastic resin such as polyvinyl chloride (PVC).

外筒体2は、たとえば外径が34mm程度、長さが150mm程度に形成されており、上流側および下流側端部の外周にはそれぞれ図示しない給水管の端部と螺合させるための雄ねじ4が螺設されている。外筒体2の内部には、上流寄りの一端側から順に、大内径部5A、小内径部5B、中内径部5Cが形成されている。大内径部5Aと小内径部5Bとは、それぞれ後記する内筒体3の頭部3Aと筒軸部3Bの上流寄りとを支持するための部位である。一方、中内径部5Cは、大内径部5Aおよび小内径部5Bに比して長い流路として形成されている。また、大内径部5Aの上流寄りおよび中内径部5Cの下流寄りには、それぞれ上流端、下流端に向けて漸次拡径する拡径部5D,5Eが形成されている。   The outer cylindrical body 2 is formed with an outer diameter of about 34 mm and a length of about 150 mm, for example, and is externally threaded to be screwed with the end of a water supply pipe (not shown) on the outer periphery of the upstream and downstream ends, respectively. 4 is screwed. Inside the outer cylindrical body 2, a large inner diameter portion 5A, a small inner diameter portion 5B, and an inner inner diameter portion 5C are formed in order from one end side closer to the upstream side. The large inner diameter portion 5A and the small inner diameter portion 5B are portions for supporting the head portion 3A of the inner cylindrical body 3 and the upstream side of the cylindrical shaft portion 3B, which will be described later. On the other hand, the medium inner diameter portion 5C is formed as a long channel compared to the large inner diameter portion 5A and the small inner diameter portion 5B. Further, on the upstream side of the large inner diameter part 5A and the downstream side of the medium inner diameter part 5C, diameter-enlarged parts 5D and 5E that gradually increase in diameter toward the upstream end and the downstream end, respectively, are formed.

内筒体3は、上流寄りの一端側に大径の頭部3Aが、下流寄りの他端側に小径長尺の筒軸部3Bが形成された形状を有し、内部には所定径の内筒流路6が形成されている。内筒流路6の内径はたとえば4.5mmである。内筒流路6の一端側には、下流に向けて漸次縮径するテーパ面6Aが形成されている。内筒体3は、たとえば頭部3Aの外筒体2の大内径部5Aへの圧入によりこれらの材料の弾性により嵌合固定される。そして、筒軸部3Bの上流寄りが外筒体2の小内径部5Bに支持されることで、筒軸部3Bの軸触れが抑制される。筒軸部3Bの下流端は外筒体2の中内径部5Cの軸心O1方向の中間部に位置する。なお、筒軸部3Bと外筒体2の小内径部5Bとの間には、0.15mm程度の隙間が形成される。   The inner cylinder 3 has a shape in which a large-diameter head portion 3A is formed on one end side near the upstream side, and a small-diameter long cylindrical shaft portion 3B is formed on the other end side near the downstream side. An inner cylinder flow path 6 is formed. The inner cylinder channel 6 has an inner diameter of, for example, 4.5 mm. A tapered surface 6 </ b> A that gradually decreases in diameter toward the downstream is formed on one end side of the inner cylinder flow path 6. The inner cylinder 3 is fitted and fixed by the elasticity of these materials, for example, by press-fitting the outer cylinder 2 of the head 3A into the large inner diameter portion 5A. And since the upstream side of the cylindrical shaft portion 3B is supported by the small inner diameter portion 5B of the outer cylindrical body 2, the axial touch of the cylindrical shaft portion 3B is suppressed. The downstream end of the cylindrical shaft portion 3B is located at an intermediate portion in the direction of the axis O1 of the inner diameter portion 5C of the outer cylindrical body 2. A gap of about 0.15 mm is formed between the cylindrical shaft portion 3B and the small inner diameter portion 5B of the outer cylindrical body 2.

内筒体3の筒軸部3Bの下流寄り部位と外筒体2の中内径部5Cとの間には、内筒体3の下流端から流出する水流により、負圧が生じる環状の負圧室7が形成される。負圧室7における外筒体2と内筒体3との隙間Tは、0.1〜1mmの範囲に設定することが好ましい。実施例では、筒軸部3Bの外径を6.5mm、中内径部5Cを8mmとし、隙間Tを0.75mmとしている。また、負圧室7の軸心O1方向の長さLはたとえば10〜30mm程度であり、実施例では30mmとしている。   An annular negative pressure is generated between the downstream portion of the cylindrical shaft portion 3B of the inner cylindrical body 3 and the inner diameter portion 5C of the outer cylindrical body 2 due to the water flow flowing out from the downstream end of the inner cylindrical body 3. Chamber 7 is formed. The gap T between the outer cylinder 2 and the inner cylinder 3 in the negative pressure chamber 7 is preferably set in the range of 0.1 to 1 mm. In the embodiment, the outer diameter of the cylindrical shaft portion 3B is 6.5 mm, the inner inner diameter portion 5C is 8 mm, and the gap T is 0.75 mm. The length L of the negative pressure chamber 7 in the direction of the axis O1 is, for example, about 10 to 30 mm, and is set to 30 mm in the embodiment.

外筒体2の軸方向中程よりも上流寄りの外周面には略円錐台状を呈した継手取り付け台座8が突設されている。この継手取り付け台座8には軸心O1と直交するように雌ねじ孔9が螺設されており、雌ねじ孔9には図3に示すように継手10が結合される。継手10は、たとえば一端側に雌ねじ孔9に螺合する雄ねじ10Aが形成され、他端側に薬液のタンク(図示せず)のホースに対する接続部10Bが形成されている。継手10の内部には開閉バルブ(図示せず)が内蔵されており、開閉レバー10Cの開閉動作により内蔵バルブによる薬液の流路の開閉が行われる。   A joint mounting base 8 having a substantially frustoconical shape protrudes from the outer peripheral surface of the outer cylindrical body 2 closer to the upstream than the middle in the axial direction. A female screw hole 9 is screwed into the joint mounting base 8 so as to be orthogonal to the axis O1, and a joint 10 is coupled to the female screw hole 9 as shown in FIG. The joint 10 has, for example, a male screw 10A that is screwed into the female screw hole 9 on one end side, and a connection portion 10B for a hose of a chemical tank (not shown) on the other end side. An opening / closing valve (not shown) is built in the joint 10, and the opening / closing operation of the opening / closing lever 10 </ b> C opens and closes the flow path of the chemical solution.

そして外筒体2には、雌ねじ孔9の底部と前記負圧室7とを連通するように薬液の流入孔11が形成されている。流入孔11は、雌ねじ孔9の底部から負圧室7に向かうにしたがい、つまり外筒体2の軸心O1に向かうにしたがい外筒体2の下流側に近づくように傾斜して形成されており、流入孔11の孔軸O2と外筒体2の軸心O1との交差角度(鋭角)θが、たとえば45〜80度の範囲(図示例では約60度)に設定されている。負圧室7に臨む流入孔11の孔開口部は概ね、負圧室7の軸心O1方向の長さLの中程に位置している。流入孔11の孔径はたとえば5mm程度である。   The outer cylindrical body 2 is formed with a chemical solution inflow hole 11 so as to communicate the bottom of the female screw hole 9 with the negative pressure chamber 7. The inflow hole 11 is formed so as to be inclined from the bottom of the female screw hole 9 toward the negative pressure chamber 7, that is, toward the downstream side of the outer cylindrical body 2 toward the axial center O <b> 1 of the outer cylindrical body 2. The crossing angle (acute angle) θ between the hole axis O2 of the inflow hole 11 and the axis O1 of the outer cylindrical body 2 is set in the range of 45 to 80 degrees (about 60 degrees in the illustrated example), for example. The hole opening portion of the inflow hole 11 facing the negative pressure chamber 7 is located approximately in the middle of the length L of the negative pressure chamber 7 in the axial center O1 direction. The diameter of the inflow hole 11 is, for example, about 5 mm.

「作用」
薬液供給装置1は、通常は灌漑給水管の配管の途中に介在するように取り付けられる。雌ねじ孔9には継手10が接続され、継手10のホース接続部10Bには、たとえば薬液貯留タンクから薬液を供給するホース(図示せず)が接続されている。薬液の供給時には、継手10の開閉レバー10Cを「開」側に回動操作する。
"Action"
The chemical solution supply apparatus 1 is usually attached so as to be interposed in the middle of the irrigation water supply pipe. A joint 10 is connected to the female screw hole 9, and a hose (not shown) for supplying a chemical solution from, for example, a chemical solution storage tank is connected to a hose connection portion 10 </ b> B of the joint 10. When supplying the chemical, the opening / closing lever 10C of the joint 10 is turned to the “open” side.

給水管中の水が薬液供給装置1内を流れて流路断面積の減少した内筒体3の下流端から噴出する際に、内筒体3周りに形成された負圧室7に速度の増加した水流により負圧が発生する。この負圧により薬液貯留タンクの薬液が吸引され、流入孔11を通して負圧室7に流入して下流側で水と混合される。従来、流入孔の孔軸が外筒体2の軸心と交差する角度には特に考慮がなされておらず通常はこれと直交するように形成されていた。この場合では、配管中の水圧が低下して薬液供給装置内を流れる水量が減少して負圧が小さくなると、薬液の吸引量が減少し又はが吸引されなくなる場合が生じた。これに対し、流入孔11の孔軸O2と軸心O1との交差角度θを45〜80度の範囲に設定すると管路水圧がある程度低下した場合であっても、流入孔11から薬液を効果的に吸引することができる。交差角度を60度に設定した本発明の実施例では90度設定の場合と比較して薬液吸入み圧力が約10%(11〜12%)増大した。   When water in the water supply pipe flows through the chemical solution supply apparatus 1 and is ejected from the downstream end of the inner cylinder 3 whose flow path cross-sectional area is reduced, the velocity is applied to the negative pressure chamber 7 formed around the inner cylinder 3. Negative pressure is generated by the increased water flow. Due to this negative pressure, the chemical solution in the chemical solution storage tank is sucked and flows into the negative pressure chamber 7 through the inflow hole 11 and mixed with water downstream. Conventionally, no particular consideration has been given to the angle at which the hole axis of the inflow hole intersects with the axis of the outer cylindrical body 2, and it is usually formed so as to be orthogonal thereto. In this case, when the water pressure in the pipe decreases and the amount of water flowing in the chemical solution supply device decreases and the negative pressure decreases, the amount of chemical solution sucked may decrease or may not be sucked. On the other hand, if the crossing angle θ between the hole axis O2 and the axis O1 of the inflow hole 11 is set in the range of 45 to 80 degrees, the chemical solution is effective from the inflow hole 11 even when the pipe water pressure is reduced to some extent. Can be aspirated. In the embodiment of the present invention in which the crossing angle was set to 60 degrees, the chemical solution suction pressure increased by about 10% (11 to 12%) compared to the case of 90 degrees.

また、前記効果は負圧室7における外筒体2と内筒体3との隙間Tを0.1〜1mmの範囲に設定することにより、一層増大させることができる。   The effect can be further increased by setting the gap T between the outer cylinder 2 and the inner cylinder 3 in the negative pressure chamber 7 in a range of 0.1 to 1 mm.

尚前記流入孔11を含む図1に示す外筒体2は熱可塑性樹脂の一体成形により金型を用いて製造される。熱可塑性樹脂としては前記ポリ塩化ビニル(PVC)の他、樹脂特性の改良のため種々の可塑剤、安定剤の添加、他の熱可塑性樹脂の配合によりポリマアロイ化したPVC等種々の樹脂が用いられる。外筒体を合成樹脂製とすることにより薬液による腐食や種々の環境要因による経時劣化を効果的に防止することができる。また構成材を樹脂とすることにより金型による一体成形が可能になり同一規格の外筒体を容易に量産することができ、材料及び製作コストが大幅に低減される。   The outer cylinder 2 shown in FIG. 1 including the inflow hole 11 is manufactured using a mold by integral molding of a thermoplastic resin. As the thermoplastic resin, in addition to the above-mentioned polyvinyl chloride (PVC), various resins such as PVC made of polymer alloy by adding various plasticizers and stabilizers and blending with other thermoplastic resins are used for improving the resin properties. . By making the outer cylindrical body made of a synthetic resin, it is possible to effectively prevent corrosion due to chemicals and deterioration with time due to various environmental factors. Further, by using a resin as the constituent material, it is possible to integrally mold with a mold, and an outer cylinder body of the same standard can be easily mass-produced, and the material and manufacturing cost are greatly reduced.

内筒体3も同様に熱可塑性樹脂により一体成形することができるが本実施例ではこれを外筒体2とは別部材として形成し、外筒体2の上流側端部から、樹脂部材の弾性を利用して圧入嵌合させることに組合せる。内筒体3は変質しやすい部分であるが、これを外筒体2に着脱可能に嵌合させることによりこの部分のみを選択的に交換することも可能である。   Similarly, the inner cylindrical body 3 can be integrally formed of a thermoplastic resin, but in this embodiment, this is formed as a separate member from the outer cylindrical body 2, and from the upstream end of the outer cylindrical body 2, Combine with press fitting using elasticity. The inner cylinder 3 is a part that is easily altered, but it is also possible to selectively replace only this part by fitting the inner cylinder 3 to the outer cylinder 2 in a detachable manner.

1 薬液供給装置
2 外筒体
3 内筒体
7 負圧室
10 継手
11 流入孔
θ 交差角度
DESCRIPTION OF SYMBOLS 1 Chemical solution supply apparatus 2 Outer cylinder 3 Inner cylinder 7 Negative pressure chamber 10 Joint 11 Inflow hole (theta) Crossing angle

Claims (4)

灌漑用の給水配管に介装され、給水配管に接続される上流側端部および下流側端部を有する外筒体と、
前記外筒体の上流側端部の内周側に組合される内筒体とを備え、
当該外筒体と内筒体との間の流路に前記内筒体を流れる水流により負圧を生じさせる環状の負圧室が形成され、
前記外筒体の周壁には、一方の端部で外部の薬液容器に連通し、他方の端部で前記流路の負圧室に開口する薬液の流入孔が形成された農業用薬液供給装置において、
前記流入孔は、外筒体の軸心に向かうにしたがい外筒体の下流端部に近づくように傾斜して形成されていることを特徴とする農業用薬液供給装置。
An outer cylinder having an upstream end and a downstream end that are interposed in a water supply pipe for irrigation and connected to the water supply pipe;
An inner cylinder combined with the inner peripheral side of the upstream end of the outer cylinder,
An annular negative pressure chamber is formed in the flow path between the outer cylinder and the inner cylinder to generate a negative pressure by the water flow flowing through the inner cylinder ,
A chemical solution supply device for agriculture, in which the peripheral wall of the outer cylindrical body is formed with a chemical solution inflow hole that communicates with an external chemical solution container at one end and opens into the negative pressure chamber of the flow path at the other end. In
The agricultural chemical solution supply device according to claim 1, wherein the inflow hole is formed to be inclined so as to approach the downstream end of the outer cylinder as it goes toward the axis of the outer cylinder.
前記流入孔の孔軸が前記外筒体の軸線に対して傾斜する角度を45〜80度の範囲に設定されていることを特徴とする請求項1記載の農業用薬液供給装置。   2. The agricultural chemical supply apparatus according to claim 1, wherein an angle at which the hole axis of the inflow hole is inclined with respect to the axis of the outer cylinder is set in a range of 45 to 80 degrees. 前記薬液供給装置中、少なくとも外筒体を熱可塑性樹脂の一体成形により形成することを特徴とする請求項1又は2に記載の農業用薬液供給装置。   3. The agricultural chemical supply apparatus according to claim 1, wherein at least the outer cylinder is formed by integral molding of a thermoplastic resin in the chemical supply apparatus. 前記薬液供給装置の内筒体を前記外筒体の上流側端部の内周側に樹脂の材料弾性を利用した圧入によって着脱可能に組合せたことを特徴とする請求項3記載の農業用薬液供給装置。   4. The agricultural chemical solution according to claim 3, wherein the inner cylindrical body of the chemical liquid supply device is detachably combined with the inner peripheral side of the upstream end portion of the outer cylindrical body by press-fitting using the material elasticity of the resin. Feeding device.
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