JPS61197889A - Method of connecting branch tube to air tube main tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for connecting a plastic branch pipe to a plastic air tube main pipe, and more particularly, the cost for connection is low, and it is particularly suitable for automatic use in agricultural fields. The present invention relates to a method for connecting a branch pipe to a main air tube, which has great economic effects in application fields where there are many connection points, such as F-pulp in an irrigation system. [Conventional technology] Crop yields are greatly affected by local weather conditions, and the amount of rainfall has a particularly significant effect on crop growth, and drastic decreases in yields due to floods and droughts have never been seen since recorded history. It has caused countless tragedies all over the world. Therefore, for example, in areas with low rainfall, so-called irrigation is carried out in which artificial water supply equipment is installed in a field to supply water to crops, thereby assisting the growth of the crops. When implementing irrigation, there are several types of irrigation that can be considered depending on the cultivation form of the crop, but currently (a) irrigation;
(b) ridge irrigation, (c) path irrigation, (d)
Methods such as watering irrigation are the mainstream, and one of the methods (a) to (d) above is used depending on the topographical conditions of the site. By the way, for irrigation of general ridge-grown crops, ridge irrigation is commonly used because the equipment is simple and the amount of water supplied is easy to adjust.
, (b), and (c) have been considered. The method shown in FIG. 2(a) is a method in which water is supplied from the passageway 4 to the grooves (between the ridges) between the ridges 6, and a siphon 7 is placed between the passageway 4 where the water level 5 is high and the ridges. Water is supplied to the field where the water level is low by pouring water across the field, and when the water supply is to be stopped, the siphon 7 is removed from the passageway 4. In the irrigation equipment shown in Figure 2 (b), a slide gate-shaped weir is installed on the side wall of the waterway 4, and when the weir is opened, water is supplied to the furrows, and when the weir is closed, water is supplied to the field. water supply will be cut off. In the irrigation equipment shown in FIG. 2(C), the water flow in the water passage 4 is divided between the furrows through branch pipes and valves, and water is supplied to or cut off from the field by opening and closing the valves. In this type of irrigation equipment, irrigation water is poured into one end of the ridges from the water passage 4 provided along the field.
As shown in FIG. 3, the state of irrigation water supply to the fields tends to be larger on the side closer to the canal 4 and less on the side farther from the canal 4. Therefore, if the amount of water supplied for irrigation is increased to bring the amount of water supplied on the far side closer to the desired amount, the amount of water supplied on the side closer to the water channel 4 will be excessive, which may cause root rot on the side closer to the water channel 1. . As can be understood from this, it is by no means easy to maintain the moisture content in the soil in the field at an optimal moisture content over the entire length of the furrows, and in order to achieve this, It is necessary to establish some strategy for controlling the supply of irrigation water. In response to these demands, research into irrigation water supply cycles has progressed, and as a result, it has become clear that by repeating water supply and water supply interruption intermittently in a fixed cycle, a uniform water supply condition can be obtained throughout the field. It's here. Therefore, control valves such as solenoid valves or diaphragm air valves are installed at each water supply port formed in the water flow channel or at a rate of one control valve for several branch pipes to control the start and stop of irrigation water supply at specific times. It has become recommended that the water content in the field be adjusted to the optimum state over the entire field by repeating the process over a cycle time. [Problem 1 to be solved by the invention Particularly when performing furrow irrigation on a farm with a vast cultivated area, automation should be promoted in consideration of efficient use of labor. It is necessary to convert the device t for supplying water from the canal and/or the canal terminal to the field (such as the layer or siphon) into a device that can be centrally managed and regulated. Therefore, as mentioned above, the first idea is to install a control valve such as a solenoid valve or diaphragm valve instead of a weir or siphon, and start and stop water supply by remote control of the valve. The figure is a schematic diagram of a conventionally used diaphragm valve. Based on this figure, the valve is shown in a closed state, and when compressed air is supplied from the air introduction hole 22, The diaphragm IO is pressed downward and the valve stem 21 is pushed down in the direction of arrow A by the pressing force. Therefore, the valve stem 21
The gasket 23 provided at the tip of the gasket 23 separates from the valve seat 24 and descends, and the water flowing in the direction of the arrow Fa force passes through the gap between the valve seat 24 and the gasket 23 and flows to the right side of the drawing (arrow Fb). Then, when the supply of compressed air from the air introduction hole 22 is stopped and the pressure is released, the valve stem 21 rises to push up the diaphragm 10 due to the restoring force of the spring, the seal 23 is pressed against the valve seat 24, and the water flow Fa is By the way, in an automatic irrigation system as shown in FIG.
When the diaphragm type valve 20a is interposed in the valve 20a, a branch pipe 25 for supplying air (compressed air) is attached to each valve 20a, and the branch pipe 25 is connected to the air tube main pipe 26.
is connected to. The air tube wood pipe 26 is provided for each unit in which a predetermined number of diaphragm valves 20a are arranged, for example, every other unit, and each is connected to a compressor 28 via a solenoid valve 27. The connecting portion between the branch pipe 25 and the air tube wood pipe 26 is provided with a T-shaped connection, for example, as shown in FIG. 6 (overall plan view) and FIG. 7 (cross-sectional view taken along the line ■-■ in FIG. Member 29 is used. The contact member 29 has an opening 30 as shown in Fig. 6.7.
．． The air tube main pipe 26 is inserted and connected to the opening 31, and the branch pipe 25 is inserted and connected to the opening 32. For example, the branch pipe 25 inserted into the connecting member 29 is sealed airtight by a rubber seal ring 33. is held, and the fitting member 34
The receiver is fitted with the member 35 in a state in which it is in contact with the outer circumferential wall of the branch pipe 25, thereby preventing the branch pipe 25 from escaping. However, although the connecting member 29 exhibits good airtightness, it not only has a complicated structure and a complicated connection operation, but also has a large number of parts and is expensive. When applied to the field of systems, one problem is that the costs for connection work and parts increase. The present invention has been made in view of these circumstances, and provides a branch pipe connection to a main air tube that is inexpensive in connection cost, and allows for easy connection operations while ensuring airtightness. It is intended to provide a method. Means for Solving Problem E] The method of the present invention that achieves the first objective is to drill a hole with a smaller diameter than the branch pipe diameter in the wall surface of the main air tube, and then drill the hole at the connecting end of the first branch pipe. Applying elastic compression to make the diameter smaller than the hole, inserting it into the hole, and connecting the branch pipe airtightly to the main air tube by the elastic recovery force of the compressed part of the branch pipe. There is a summary in . [Operation] In the present invention, first, a hole for inserting a branch pipe is bored in the wood wall of the air tube. The diameter of the drilled hole must be smaller than the diameter of the branch pipe. However, there are no particular restrictions on the perforation means; for example, a punch or the like may be used to punch through the wall of the main air tube.On the other hand, the connecting end of the branch pipe should be made with a diameter smaller than the diameter of the perforation so that it can be inserted into the perforation. It is necessary to make the diameter small, and for that purpose, for example, the diameter of the connecting end is reduced using a narrow pressure tool such as a caulking tool. However, when reducing the diameter, the diameter must be reduced within the elastic limit so as not to break the branch pipe material, and the connecting end may be heated if necessary during the diameter reduction. Next, when the reduced diameter connecting end of the branch pipe is inserted into the bored hole of the main air tube and held in that state, the reduced diameter connecting end tends to return to the original branch pipe diameter due to its elastic recovery force. However, the base of the reduced-diameter connection end is suppressed by the air tube main's drilling hole and cannot expand beyond the diameter of the drilled hole, so the reduced-diameter connection part is wedged into the air tube's main hole, causing the air tube to form a wood pipe. The branch pipe is not only firmly connected, but also has a high airtightness because the outer circumferential surface of the base of the reduced diameter connection end is in close contact with the drilled hole. The basic configuration of the present invention is as described above, but it is recommended that the hole diameter of the drilled hole is preferably 85 to 95% of the branch pipe diameter, and the outer diameter of the branch pipe connection end is the branch pipe diameter. 80
It is desirable that the material of the main air tube and the branch pipe in the present invention be made of plastic material, as long as it is a plastic material. Examples include PE and nylon, but in the present invention, From this point of view, Young 4g0
．． 4 to 1.0 (X 1G' kg/0m2) is particularly preferable.If the main air tube and the branch tube are made of the same material, the coefficient of linear expansion of both will be the same, which will prevent the bonding due to temperature changes. Looseness and deterioration of airtightness can be more reliably avoided. In addition, in the present invention, it is recommended to use a tool 38 having both a punching part 36 and a clamping part 37 as shown in FIG. 8 in order to easily perform the drilling operation and the clamping operation. [Example] As shown in FIG. 1(A), a hole diameter of 4 is punched into a PE air tube main pipe 41 with an outer diameter of g and om- using a punch (not shown).
A hole 42 with a diameter of 60 mm was drilled. On the other hand, the diameter of the tip of a PE branch pipe 25 with an outer diameter of 4.5 +s-, which communicates with the diaphragm valve, was reduced to 3.8 mm* using a caulking tool (not shown) to produce a connecting branch pipe. 0 Next, the TA connecting end 25a of the branch pipe 25 is inserted into the bored hole 42, and after a while, the connecting end of the branch pipe recovers elastically as shown in FIG. 1(B) (cross-sectional explanatory diagram). The root portion 25b was in strong contact with the drilled hole 42, and the tip 25a of the connecting end was wider than the diameter of the drilled hole, so that a solid and airtight bonding state could be obtained. [Effects of the Invention] The present invention is configured as described above, and can obtain the effects summarized below. (1) Since there is no need for any connection members as shown in Figure 6.7, the cost required for connection can be dramatically reduced, and it is very useful in fields with many connection points such as automatic irrigation systems. Economic effects can be obtained. (2) The operation for connection is easy, and a connection state that is firm and has sufficient airtightness can be obtained.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are schematic explanatory diagrams showing an embodiment method of the present invention, Figures 2 (a) to (C) are perspective views showing a ridge irrigation method, and Figure 3 is a diagram showing a method for irrigation in a field. 4 is a sectional explanatory diagram showing the state of water penetration; FIG. 4 is a sectional explanatory diagram showing a diaphragm type valve; FIG. 5 is a perspective explanatory diagram showing an automatic irrigation system; FIG. 6 is a plan view showing a T-shaped connecting member; 7 is a sectional view taken along the line ■-w in FIG. 6, and FIG. 8 is a schematic diagram showing a caulking tool with a punch applied to the implementation of the present invention. 25... Branch pipe 25a... Connection end 25
b... Root part 41... Air tube 4
2...Drilling hole

Claims (1)

[Claims] A method of connecting a plastic branch pipe to the wall of a plastic air tube wood pipe, in which a hole with a diameter smaller than the diameter of the branch pipe is drilled in the wall of the main air tube, and then the connecting end of the branch pipe is connected to the Applying elastic compression to reduce the diameter,
A method for connecting a branch pipe to a main air tube, the method comprising inserting this into the bored hole and connecting the branch pipe to the main air tube in an airtight manner by the elastic recovery force of the branch pipe compression section. .