JP7334322B1 - PVC irrigation header - Google Patents

Abstract

An object of the present invention is to provide an irrigation header that has a long service life, is easy to replace and maintain, and is durable at low cost. [Solution] The present invention is a vinyl chloride irrigation header that branches water supply destinations from a water pipe into a plurality of locations, and includes a vinyl chloride joint member for connecting to the water pipe, and a vinyl chloride joint member for connecting to the water pipe. a main water supply pipe, a vinyl chloride piping member disposed between the joint member and the main water supply pipe, a vinyl chloride end cap provided at the rear end of the main water supply pipe, and the main water supply pipe A hose joint nipple or a hose joint is attached to a plurality of vinyl chloride branch pipes provided in the main water supply pipe, and the connecting portion of the main water supply pipe and the branch pipe is integrated by welding. [Selection diagram] Figure 1

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an irrigation header, and more particularly, to a technique of an irrigation header in which joints with a plurality of branch pipes provided in a PVC main water supply pipe are integrated by welding.

For the healthy growth of vegetables, it is necessary that various environmental factors surrounding the above-ground and below-ground parts of the plant be in a state suitable for the plant. They depend on various factors such as light, temperature, humidity, and carbon dioxide concentration, among which the water that plants need plays an important role. Water occupies most of the plant body, serves as a raw material for photosynthesis within the plant body, assists the movement of inorganic elements absorbed by the roots and assimilated products synthesized in the leaves, and evaporates water from the stomata of the leaves. (Transpiration) also regulates the temperature of the leaves. However, transpiration causes temporary wilting of the plant body during sunny days, and if the soil is dry and water is not replenished, it will become permanent wilting and will die due to dehydration. In order not to wither and die, it is very important to stably supply water in the soil.

“Water” is also necessary for photosynthesis, an activity in which plants produce their own nutrients. However, only a small portion of the water absorbed by the roots is used for photosynthesis, and more than 200 times the amount of water that is decomposed by photosynthesis into oxygen is lost through transpiration. When a plant is left in a dry state, its stomata are closed to suppress transpiration, and when the stomata are closed, naturally carbon dioxide cannot be taken in, and the rate of photosynthesis decreases. Therefore, the role of "water" in plants is very important, and proper watering is necessary to keep the soil at an appropriate level of humidity and achieve stable growth without stressing the plants.

Here, when cultivating in a facility where rain does not fall, such as greenhouse cultivation, and even in outdoor cultivation, when it does not rain for a long time such as in hot summer and the soil dries out, it is necessary to artificially water the crops. Giving water is called irrigation. Watering is generally carried out by burying watering hoses in the ground or placing them at the base of the ground to water the farmland. Those with holes, those with holes on one side and those with holes on both sides. Furthermore, the holes are finely spaced, and there are many types of hoses. There are many types, such as a spray type that sprays water in a soft mist, a drip type that gradually penetrates water, and a multi-type. You have to choose accordingly. In order to arrange the irrigation hoses for each ridge in which the soil is heaped up in a long, narrow straight line with a number of intervals, an irrigation header for branching the water supplied from the water pipe is used.

The irrigation hose will become clogged if used for a long period of time, and should be replaced periodically about once a year. It must be strong enough to withstand frequent attachment and detachment work. For this reason, the conventional irrigation header is made of metal, and the connection points between the main water supply pipe and the branch pipe are firmly joined by welding or the like. In the case of carbon steel and low-alloy steel, which are not stainless steel, metallographic structures different from those of the material, such as solidified structure, quenched structure, normalized structure, and annealed structure, are generated in the welded part, and these structures are , corrosion resistance (corrosion potential) is slightly different, and since these dissimilar structures are joined at the weld, a potential difference occurs between the structures and corrosion (corrosion between dissimilar metals, galvanic corrosion) occurs. The welded portion rusts more easily than the base metal portion with a uniform structure. There is also a method in which a branch pipe is screwed in by applying burring processing to the connection part related to the main water supply pipe, but there are problems of cost due to increased processing burden, difficulty in adjusting the angle when tightening, and water leakage. This is not suitable because it can also be a cause. In the case of stainless steel, it can be joined by TIG welding or the like, but there remains the problem of high material and processing costs. Therefore, in order to solve the problem of whether it is possible to develop a low-cost and durable irrigation header that does not cause problems of rust and corrosion, we focused on vinyl chloride, which is already used as a material for water pipes, The present invention was completed under the idea of using it for headers.

Here, since the features of the irrigation header differ greatly depending on what kind of material it is made of, if you consider it, for example, when selecting from metals such as iron, lead, copper, and stainless steel, even metals are the most excellent in workability and strength. Taking the example of iron, which has sufficient physical strength, iron has the advantage of not being easily damaged and has a low risk in the event of an earthquake, but on the other hand, iron has the major disadvantage of being prone to rusting, and is resistant to oxidation. Clogging due to rust is a problem in irrigation headers. In this regard, stainless steel has an advantage that iron does not have: it is durable and has high strength, and it does not generate rust. However, it can be said that there are still problems such as high material costs and processing costs, and each has advantages and disadvantages.

On the other hand, it can be considered to be made of resin (HIVP). This is because resin generally has high watertightness and corrosion resistance, and PVC pipes and polyethylene pipes, which are already used as water pipes, are lightweight and have high corrosion resistance. Another major feature is that it is easy to process, and since it is easy to adjust the length, it does not take much time to manufacture. However, since there are various types of resin materials, each of which has its own demerits, sufficient consideration must be given to the selection of the resin material. For example, polyethylene can be used in a variety of applications because it is resistant to heat and vibration, but it has the disadvantage of being perforated by sunlight. If there is a hole, you will of course have to replace it.

In the case of large-scale greenhouse cultivation or open-field cultivation using an irrigation system, the system also becomes large in its own way. A system has also been constructed that allows watering to be performed remotely from anywhere using a mobile terminal such as a smartphone (registered trademark). However, introduction of such a system requires a large cost burden, and depending on the size of the farm, there is a large cost problem.

In addition, since it is possible to easily connect various watering components such as watering hoses branched by the watering header in a small space, it is compact and does not interfere with the installation and removal of, for example, a multi-sheet recovery device in a narrow house. It is desired to be an irrigation header.

Also, like other agricultural equipment, irrigation equipment requires maintenance for long-term use, but the initial investment for irrigation equipment is relatively high, and it may take several years to recover the investment if multiple units are installed. be. Therefore, an irrigation header that can be manufactured and installed at low cost is desired.

In order to meet such demands, various technical proposals have been made. For example, there has been disclosed a technique titled "piping structure and piping structure construction method" (see Patent Literature 1). Specifically, the problem is to "provide a piping structure and a piping structure construction method that can easily construct prefabricated piping with stable quality." A piping structure of prefabricated piping that is laid in an area to be laid after being connected has a sleeve through pipe material 7 that can penetrate a sleeve formed in the area to be laid, and is arranged on one side of the sleeve in the penetrating direction. A connection member that connects a second prefabricated pipe having a first prefabricated pipe and a connecting pipe that can be connected to the sleeve-penetrating pipe, the second prefabricated pipe arranged on the other side in the sleeve-penetrating direction, and the sleeve-penetrating pipe and the connecting pipe. and have.” However, the invention described in Patent Document 1 is technically characterized in that the joints between pipe members are joined using a sleeve-penetrating pipe member, a three-way branch joint, or a fastener clip. It is not intended to secure the strength by welding the connection between the main water supply pipe and the branch pipe.

Also, a technique entitled "Coupling, Coupling with Minute Length, and Piping System Method and Piping Construction Method Using the Same" is disclosed (see Patent Document 2). Specifically, the problem to be solved is "a branch pipe used in a prefabricated construction method for piping in buildings and a piping method using the branch pipe, which is easy to position the branch part, easy to join, and has a small diameter communication hole in the floor. To provide a branch pipe and a piping method using the branch pipe, which does not require a large space for construction and can be constructed without damaging or deforming the piping. A joint with a branch pipe is used in the prefabrication method of No. 1. The joint with a branch pipe includes a joint main body having an upper joint portion, a lower joint portion, and a trunk portion, each having the same central axis, and a trunk of the joint main body. and a main pipe portion to which a main pipe of a certain length is joined to either the upper joint portion or the lower joint portion; is characterized in that the connecting part of the is an electrofusion joint." However, in the invention described in Patent Document 2, the connection means for the main water supply pipe and the branch pipes according to the present invention is common in that the joints where the ends of the pipes are inserted and joined are electrofusion joints. However, it is characterized in that the other of the joints joined to the main pipe is an electric fusion joint, and is different from the present invention in that the branch pipe and the main pipe are not integrated. are doing.

Further, a technique entitled "Resin Pipe Punching Method and Prior Apparatus" has been disclosed (see Patent Document 3). Specifically, the object is to provide a resin pipe drilling method and a resin pipe drilling device that suppresses heat generation during cutting and softening of the resin to prevent cutting debris from entangling with the cutting edge of a rotary cutting blade. To provide a resin pipe piercing method and a resin pipe piercing device in which shavings are less likely to remain in the pipe. A pipeline branching pipe member is connected in a state surrounding a scheduled drilling location of a pipe wall of a pipe, a punching device main body is attached to a pipe opening on the other end side of the tubular portion, and a rotary cutting blade of the punching device main body is attached to the tubular portion. With the gate valve kept open, water is supplied to the scheduled drilling location through the water passage of the pipe member, and the drilling is performed. The rotary cutting blade of the main body of the device is used to pierce the wall of the resin pipe, and the shavings are collected in the body of the rotary cutting blade. However, the invention described in Patent Document 3 provides a resin pipe drilling method and a resin pipe drilling apparatus that suppress heat generation during cutting and softening of the resin so that cutting chips are less likely to get entangled in the cutting edge of the rotary cutting blade. It can be used as a pre-stage of connecting means for connecting the main water supply pipe and the branch pipe, but the problem to be solved is different from the welding means for the main water supply pipe and the branch pipe according to the present invention. It is a thing.

JP 2018-80463 Japanese Patent Application Laid-Open No. 2006-105389 Japanese Patent Application Laid-Open No. 2001-82662

SUMMARY OF THE INVENTION It is an object of the present invention to provide a durable irrigation header which has a long service life, facilitates replacement and maintenance, and is inexpensive.

The present invention is a polyvinyl chloride irrigation header for branching a water pipe into a plurality of supply destinations, comprising a vinyl chloride joint member for connecting to the water pipe, and a vinyl chloride main water supply pipe. a vinyl chloride piping member disposed between the joint member and the main water supply pipe; a vinyl chloride end cap provided at the rear end of the main water supply pipe; A hose joint nipple or hose joint attached to a vinyl chloride branch pipe;
, and a configuration is adopted in which the connecting portions of the main water supply pipe and the branch pipe are integrated by welding.

Moreover, the present invention can employ a configuration in which an opening/closing cock is provided in the joint member.

The vinyl chloride irrigation header according to the present invention exhibits an excellent effect that it can be manufactured at a lower cost than the conventional metal irrigation header.

ADVANTAGE OF THE INVENTION According to the polyvinyl chloride irrigation header of the present invention, it exhibits an excellent effect of not generating rust or corrosion due to the influence of chlorine contained in tap water.

According to the vinyl chloride irrigation header of the present invention, it is small, lightweight, and can be easily installed, and exhibits excellent effects that it can be installed easily even in a narrow place such as a vinyl house without taking up space.

In addition, according to the polyvinyl chloride irrigation header of the present invention, since the connection between the main water supply pipe and the branch pipe is integrated by the welding means, there is no fear of water leakage, and high strength can be obtained. effective.

In addition, in the vinyl chloride irrigation header according to the present invention, when a configuration in which an opening/closing cock is provided is adopted, an excellent effect is exhibited in that opening/closing operation of water supply to all the branch pipes can be performed.

1 is a basic configuration explanatory perspective view for explaining the basic configuration of a vinyl chloride irrigation header according to the present invention; FIG. FIG. 4 is an embodiment configuration explanatory diagram showing the configuration of another embodiment of the vinyl chloride irrigation header according to the present invention; FIG. 10 is an embodiment configuration explanatory diagram showing another branch pipe arrangement configuration example in the vinyl chloride irrigation header according to the present invention; FIG. 4 is a usage state explanatory diagram showing the usage state of the vinyl chloride irrigation header according to the present invention.

The present invention is a polyvinyl chloride irrigation header for branching a water pipe into a plurality of supply destinations, comprising a vinyl chloride joint member for connecting to the water pipe, and a vinyl chloride main water supply pipe. a vinyl chloride piping member disposed between the joint member and the main water supply pipe; a vinyl chloride end cap provided at the rear end of the main water supply pipe; A hose joint nipple or hose joint attached to a vinyl chloride branch pipe;
The most characteristic feature is that the connecting portions of the main water supply pipe and the branch pipe are integrated by welding. Description will be made below with reference to the drawings. However, the shape and configuration are not limited to those described in the drawings, and can be changed within the range where the effect exhibited as the creation of the technical idea of the present invention can be obtained.

FIG. 1 is an explanatory diagram of a basic configuration for explaining a basic configuration of a vinyl chloride irrigation header 1 according to the present invention. FIG. 1 shows a configuration example in which the main water supply pipe 40 is folded back and arranged parallel to the vertical water pipe, and three branch pipes each of six are directed in the same direction. , each component will be described below.

The water pipe 10 is a water pipe that supplies water W that is indispensable for growing plants. Water supply is also one of the important water supply facilities, and the ministerial ordinance that establishes the technical standards for water supply facilities based on the provisions of the Water Supply Act states that the water pressure range at the point where the water pipe branches to the water supply pipe is 0.15Mpa or more to 0.74Mpa. It is within Using this water pressure, water is supplied from the water supply header through the water supply hose 100 . In addition, when water is taken from a tap, there is also a method of storing water in a water storage tank once and then sending the water with a sprinkling pump in order to secure a large amount of water. In addition, in the morning and evening when there is a lot of demand from home, the water pressure may drop temporarily, and it may be necessary to store it in a large water storage tank. If the water pipe is a thick main pipe, there is no problem, but if it is a branch pipe, the water pressure may be insufficient, so it is necessary to be careful about where the water is taken from.

The vinyl chloride 20 is a basic component material of the vinyl chloride irrigation header 1 according to the present invention, and the term "vinyl chloride" is a general term including "vinyl chloride resin" or "polyvinyl chloride". It is also abbreviated as “vinyl chloride” and is a type of plastic made by polymerizing vinyl chloride (chloroethylene). In English, it is abbreviated as PVC (Poly Vinyl Chloride). Soft PVC is also called soft vinyl or soft vinyl.
PVC, like polyethylene (PE), polypropylene (PP), and polystyrene (PS), is a material classified as one of the five major general-purpose resins. Although its performance is not very high, it is inexpensive and can be produced in large quantities. Another feature is that hard and soft products can be obtained by adjusting the amount of plasticizer added in the manufacturing process. PVC uses ethylene and chlorine, which are cheap and mass-produced, as raw materials, and has the advantage of being resource-saving in production compared to other resin products that use petroleum as raw materials.

The difference between polyvinyl chloride and vinyl chloride The monomer vinyl chloride (chloroethylene) that is repeatedly bonded is called polyvinyl chloride, and the word "poly" in polyvinyl chloride comes from the word polymer. And it means "a lot". However, in many cases, the general term "vinyl chloride" refers to polyvinyl chloride, not vinyl chloride. As described above, the "vinyl chloride 20" according to the present invention includes both polyvinyl chloride (vinyl chloride) and vinyl chloride.

About soft PVC and hard PVC There are two types of PVC, "soft PVC" and "hard PVC". Soft PVC is a soft material, and even if it is somewhat thick, it is flexible enough to be bent by hand. Rigid PVC, on the other hand, is hard and strong. These differences are not only in hardness, but also in physical and mechanical properties. For example, soft PVC has a specific gravity of 1.16 to 1.35, while hard PVC has a specific gravity of 1.30 to 1.58. In terms of tensile strength, soft PVC is 6.9-25 MPa, and hard PVC is 34-62 MPa, which is a big difference. Due to the difference in strength, etc., it is desirable to use hard PVC for the vinyl chloride 20 according to the present invention.

Regarding the degree of polymerization (molecular weight) of PVC, monomers, which are relatively small molecules, are repeatedly linked together to form a polymer. It can be used for various purposes.

Here, the main advantages and disadvantages of the vinyl chloride 20 will be described.
Advantages of vinyl chloride 20 ・Chemical resistance: Strong resistance to chemicals.
・Acid and alkali resistance: Resistant to acid and alkali.
・Water resistance: Impervious to water.
・Electrical insulation: It is difficult to conduct electricity.
・Flame resistance: Oxygen index is as high as 45 to 49, classified as a self-extinguishing resin.
・Durability: Less deterioration over time under normal operating conditions.
・Coloring and printing processability: Coloring and pattern printing are possible.
・Low cost: Low price compared to other materials. Since the weight is not heavy, transportation and management costs can be reduced.
Disadvantages of vinyl chloride 20 (heat resistant temperature and melting point)
・Heat resistance: PVC has poor heat resistance, with a heat resistance temperature of 60 to 80°C and a melting point of 85 to 210°C.
・Impact resistance: Poor impact resistance compared to the other five major general-purpose resins. Especially in a low temperature environment, the impact value decreases.

Water W is tap water supplied by the water pipe 10 . Tap water in Japan meets strict hygiene standards and does not contain chemicals that could kill plants, so there is no need to worry about water quality. Fresh water W supplied from such tap water has the effect of promoting the growth of plants. In addition, the water W which concerns is not limited to tap water, and rainwater is also included.

The joint member 30 is a member for coupling and connecting the water pipe 10 and the main water supply pipe 40 .

The main water supply pipe 40 is a water pipe that guides the water W supplied from the water pipe 10 to the branch pipe 90 .

The piping member 50 is a member used to change the direction of the flow path when the water pipe is configured vertically. In the basic configuration shown in FIG. 1, two L-shaped elbows are combined so that the water pipe 10 and the main water supply pipe 40 are parallel to each other and are folded back in a U shape. , 2 and 3, in which the main water supply pipe 40 is arranged horizontally, one elbow is sufficient. Although not particularly shown in the drawings, joints and the like are provided inside. The joints of the piping members 50 and the like, which are members made of vinyl chloride 20, may be made by using adhesives for PVC pipes, and the adhesives are made by dissolving the base material (vinyl chloride resin) or the like in an organic solvent. , Use a dedicated adhesive that complies with Japan Water Works Association standard JWWA S101 "Adhesive for hard PVC pipes for water supply".

The end cap 60 blocks the passage of the main water supply pipe 40 . After passing the branch pipe 90 in the main water supply pipe 40, it is arranged at a distance from the branch pipe 90 in order to secure a fixing portion for fixing to the fixing frame F or the like with metal fittings or the like.

The hose joint nipple 70 is a member that connects the hose and the hose joint 71 .

The hose joint 71 is a member provided for attaching the hose joint nipple 70 to the branch pipe 90 . The configuration of the hose joint 71 includes a one-touch coupling type, a screw-in joint type, and the like.

The connecting portion 80 is a connecting portion between the main water supply pipe 40 and the branch pipe 90, and is conventionally connected by adhesion or screwing. In the polyvinyl chloride irrigation header 1 according to the present invention, the main water supply pipe 40 and the branch pipe 90 are integrated by welding means. As such a welding means, it is conceivable to use a dedicated apparatus for vinyl chloride that welds using a heat gun and a welding rod. This is adjusted to the optimum temperature and wind pressure for welding of PVC, and while melting the joint, it is built up with a welding rod of the same material as the base material, and the two are melted and joined together. With conventional metal water supply headers, when iron is welded together, durability becomes a problem due to oxidation of the welded parts. 40 and the branch pipe 90 become difficult to connect, the flange portion is formed by burring processing, and when welding stainless steel by Tig welding, there is a difference in bond strength depending on the skill level of the welder. Problems associated with thinning have arisen in means. Although a resin-made irrigation header in which the main water supply pipe 40 and the branch pipe 90 are integrated by injection molding is available on the market, the cost of the mold is high in this case, and the problem of the present invention, which is to reduce the cost, is overcome. cannot be resolved.

The branch pipe 90 is a pipe for branching the water W supplied from the main water supply pipe 40, and in FIGS. It is not limited, and may be appropriately selected depending on the relationship with the water pressure and the amount of water. Moreover, such a branch pipe must be firmly fixed because it is pushed in for connection when the hose joint 71 and the hose joint nipple 70 are detached from each other. In addition, it must be installed in consideration of fatigue failure due to repeated detachment.

The irrigation hose 100 may be needle-punched, laser-punched with very small holes, single-sided or double-sided. Further, the intervals between the holes are fine and divided into many types, and the water W is spread over the soil through the watering hose 100 . There are many types such as a spray type that sprinkles water W in the form of a soft mist, a drip type that gradually penetrates water W, and a multi-type type. etc., should be selected according to the application. In order to arrange the watering hoses 100 for each ridge in which the soil is heaped up in a long and thin straight shape with a number of intervals, the water W supplied from the water pipe is branched to supply the water W to the plants S. It is used to supply

FIG. 2 is an explanatory view showing the construction of another embodiment of the polyvinyl chloride irrigation header according to the present invention. A main water supply pipe 40 is arranged, and six branch pipes 90 are arranged in three downward directions in the same direction, and a joint member 30 for connecting and connecting the water pipe 10 and the main water supply pipe 40 is opened and closed. It shows a configuration in which a cock 31 is provided. FIG. 2(a) shows a front view, and FIG. 2(b) shows a plan view.

The open/close cock 31 is a so-called main cock that opens and shuts off the supply of water to the main water supply pipe 40 . What is shown in the drawings is merely an example and is not limited to such types of cocks. It should be noted that it may be replaced with a valve or the like.

FIG. 3 is an explanatory diagram of an embodiment configuration showing another example of arrangement configuration of branch pipes in the vinyl chloride irrigation header according to the present invention. FIG. 3(a) shows a front view, and FIG. 3(b) shows a plan view. FIG. 3 shows a configuration example in which six branch pipes 90 are linearly arranged in a row in the longitudinal direction of the horizontally arranged main water supply pipe 40 in the same direction. In this example of arrangement, all the branch pipes 90 are aligned in one direction, so the depth is small and slimming can be achieved.

FIG. 4 is a usage state explanatory diagram showing the usage state of the vinyl chloride irrigation header 1 according to the present invention. As shown in FIG. 4, the plants S planted in three ridges are being watered with water W by the watering hoses 100 divided into three on each side from the main water supply pipe 40 . In this arrangement example, the branch pipes 90 are arranged in two directions, so that the length of the main water supply pipe 40 can be shortened and made compact.

According to the irrigation header made of vinyl chloride according to the present invention, it is possible to reduce the burden of watering, especially in greenhouse cultivation of strawberries and the like, and it is possible to provide a irrigation header with a long service life at low cost, so it is particularly useful in the field of agriculture. It is considered to be highly available.

1 PVC irrigation header 10 Water pipe 20 Vinyl chloride 30 Joint member 31 Open/close cock 40 Main water supply pipe 50 Piping member 60 End cap 70 Hose joint nipple 71 Hose joint 80 Joint 90 Branch pipe 100 Irrigation hose
Water

Claims (2)

An irrigation header (1) made of vinyl chloride (20) for branching a plurality of supply destinations of water (W) from a water pipe (10),
The water pipe (10) and the main water supply pipe (40) made of vinyl chloride,
a joint member (30) made of vinyl chloride for connecting the water pipe (10) and the main water supply pipe (40);
a vinyl chloride piping member (50) disposed between the joint member (30) and the main water supply pipe (40);
a vinyl chloride end cap (60) provided at the rear end of the main water supply pipe (40);
A hose joint nipple (70) or a hose joint (71) attached to a plurality of vinyl chloride branch pipes (90) provided in the main water supply pipe (40);
consists of
A plurality of branch pipes (90) are arranged in the longitudinal direction of the main water supply pipe (40) so as to face each other in opposite directions. Aligning the flow direction of the branch pipe (90) in the same direction,
An irrigation header (1) made of vinyl chloride, wherein a joint (80) of said main water supply pipe (40) and said branch pipe (90) is integrated by welding. An irrigation header (1) made of vinyl chloride, wherein an opening/closing cock (31) is provided in the joint member (30).