RU2344592C1 - Spray tube for drip irrigation - Google Patents

Abstract

FIELD: agriculture.

SUBSTANCE: drip tube consists of a water supply channel, a main sprayer, a secondary sprayer, connectives, water input channels and drainage outlets. The main and the secondary sprayers are represented by zigzag-shaped labyrinths. The main and the secondary sprayers are hydraulically coupled via the connectives. Each zigzag-shaped labyrinths is a variable clear opening channel. Shape of one of the continuous lateral side walls is described by Equation y=arc cos (cos x), where y and x are the Cartesian coordinate system applicate and absciss accordingly. Shape of the opposite wall is described by Equation y=arc sin (sin x). Within the channel restricted sections the walls are rounded off.

EFFECT: uniform water distribution with the both sprayers along the spray tube.

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Description

The invention relates to agriculture, in particular to irrigated agriculture, and can be used in irrigation systems of surface irrigation for cultivation of vegetable crops.

A water outlet of an irrigation pipeline is known, including a housing with a drain hole and a fastener connecting the housing to the pipeline, in which, in order to increase operational reliability, the housing is formed by two sidewalls connected by a vault consisting of a front horizontal part and a rear curved part smoothly conjugated with it, directed convexity outward, while the outlet of the housing is placed therein opposite the rear curvilinear part of the arch; fasteners are made in the form of a plate placed on the inside of the pipeline and connected to its last body by means of screws, made flush, while the plate is equipped with a protrusion with an oblique cut located behind the inlet (copyright certificate SU No. 1501981 A1, M. cl. ⁴ A01G 25/02. Water outlet of the irrigation pipeline. / MP Penzin, B. A. Averin, A. N. Rakov, V. I. Maksimov (USSR) .- Application No. 4297651 / 30-15; Stated 08/17/1987 ; Published on August 23, 1989, Bull. No. 31 // Discoveries. Inventions. - 1989.- No. 31).

The disadvantages of the described irrigation pipeline include the low manufacturing technology, the high cost of 1 running meter of the pipeline, the high cost of manual labor associated with assembly, the high cost of laying out the irrigation pipeline, and the soil obstruction of the water outlet.

Part of these drawbacks is eliminated in the known method of manufacturing an irrigation tube for drip irrigation, which includes sequential operations of extrusion of a hollow shaped billet from a thermoplastic, blowing a bubble, forming a shaped product and cooling, in which a modified radiation polyolefin is used as a thermoplastic, the molten mass is passed through the extrusion process through throttle assembly with an asymmetric and multidimensional set of through holes; during inflation, the pressure inside the body The eggs are set according to the difference in water level in the flow of irrigation pipes at the inlet and outlet of the cooling zone, in the process of forming, the oval-shaped sleeve is first blown, then the profile contour, the latter is pulled through a clamping device made in the form of two molding drums: the first driven with a forming contour the external profile of the molded moldings, the second - the lead with radially mounted blocks for the formation of the maze, and after cooling, a longitudinal section of the molded moldings is carried out by about separate irrigation tubes, moreover, the profile contour is formed with adjustment of the welded seams with a cut of no more than 3 mm; linear speed of the driven drum is 1-5% less than the linear speed of the driving drum (patent RU No. 2282534 C1, IPC В29С 47/02 (2006.01), B29D 23/00 (2006.01), В29С 51/02 (2006.01). Continuous manufacturing method irrigation pipe for drip irrigation. / P.N. Kuznetsov (RU), KABelyaev (RU), V.V. Melikhov (RU), E.A. Khodyakov (RU), V.F. Loboiko (RU), T .V. Karengin (RU) .- Application No. 2005109129/12; Stated March 29, 2005; Published on August 27, 2006, Bull. No. 24 // Inventions. Utility models. - 2006. - No. 24).

The disadvantages of the described method of manufacturing an irrigation tube for drip irrigation include the fact that the rate of water release in each subsequent dropper from the established norm (for example, 4 l / h) varies from 18 to 42%. This is because the linear rotation speed of the driven drum does not correspond to the linear speed of the driving drum. Formed labyrinth channels when superimposed before welding profile contours of the leading and driven drums are displaced along the irrigation tube. This changes the "living section" of the labyrinth channels and thereby does not provide the specified rate of flow of irrigation water in each subsequent built-in dropper.

The closest analogue to the claimed object includes an irrigation tube for drip irrigation, containing a channel for supplying water, a primary and secondary dropper, made in the form of a labyrinth, spaced inlet channels and water outlets, in which the droppers have a zigzag section and communicate with each other through connecting elements installed to the inner vertices of the zigzag, and the dimensions of the living section of one step of the zigzag at the top and its side surface are in a ratio of 2: 1, the ratio of the length of the droplet tsya and its transverse size is not less than 24: 1, and the ratio of the number of inlet channels, connecting elements and outlets is 2: 1: 1; it has a two-way water outlet (patent RU No. 2280977 C1, IPC A01G 25/02 (2006.01). Irrigation pipe for drip irrigation. / V.V. Melikhov (RU), P.I. Kuznetsov (RU), V.F. Loboiko (RU), EAHodyakov (RU), K.A. Belyaev (RU), T.V. Karengina (RU) - Application No. 2005105856/12; Declared March 2, 2005; Publish. August 10, 2006, Bull. No. 22 // Inventions. Utility models. - 2006. - No. 22).

The disadvantages of the described irrigation tube for drip irrigation, which we adopted as the closest analogue, include a high degree of uneven flow of irrigation water by droppers along the length of the irrigation tube.

The essence of the claimed invention is as follows.

The problem to which the invention is directed is to increase the operational reliability of drip irrigation.

The technical result is a decrease in the degree of uneven distribution of irrigation norms of the dropper along the length of the irrigation tube.

The specified technical result is achieved by the fact that in the known irrigation tube of drip irrigation, including a channel for supplying water, made in the form of a labyrinth of zigzag shape, the main and secondary droppers are hydraulically connected by connecting elements installed to the inner vertices of the zigzag, spaced inlet channels and outlets, according to of the invention, each labyrinth of a zigzag shape is made in the form of a channel with a variable live section, one of the continuous side walls has a shape describing defined by an equation of the form y = arc cos (cos x), where y and x are the applicate and abscissa of the Cartesian coordinate system, and the opposite wall has the form described by the equation of the form y = arc sin (sin x), while the walls are in the narrowing of the channel rounded off.

The invention is illustrated by drawings.

Figure 1 presents the irrigation pipe, a cross section.

Figure 2 - section aa in figure 1, a diametrical section in the cavity of the overlay of the primary and secondary droppers.

In Fig.3 - place B in Fig.2, a fragment of the channel of the main dropper with a variable live section.

Information confirming the possibility of implementing the claimed invention are as follows. Irrigation pipe for drip irrigation contains a channel 1 for supplying water, a main dropper 2, a secondary dropper 3, connecting elements 4, inlet channels 5 and outlets 6.

Channel 1 (see Fig. 1) in the form of a hollow oval or circle is made of thermoplastic tape 7, for example, a modified radiation polyafen, followed by resistance welding of the joined edges.

The main dropper 2 and the secondary dropper 3 are made in the form of a labyrinth of a zigzag shape. The droppers 2 and 3 are hydraulically connected by means of connecting elements 4. The connecting elements 4 are installed to the outer vertices 8 and 9 (see figure 2).

Each zigzag-shaped labyrinth (see FIGS. 2 and 3) is made in the form of a water supply channel 10 with a variable live section. One of the continuous side walls 11 (see figure 3) has the form described by the equation

y = arc cos (cos x),

where y and x are the applicate and abscissa of the Cartesian coordinate system. Opposite to the wall 11, another continuous wall 12 has a curved shape described by an equation of the form

y = arc sin (sin x).

The walls 11 and 12 at the narrowing points 13 of the channel 10 are rounded with a radius r. Irrigation pipe for drip irrigation works as follows.

Irrigation water in the channel 1 comes under a pressure of 0.01 ... 0.02 MPa. Due to this, part of the water through the inlet channels 5, located on the top 8 of the zigzags of the channel 10, is sent to the main dropper 2. From the main dropper 2, due to the connecting elements 4, the mass of water is directed to the secondary dropper 3. When it is completely extinguished, the water energy from the secondary dropper 3 on water outlets 6 in the form of drops only due to cavitation force falls (flows) to the surface of the irrigated area.

The laminar flow of irrigation water from the inlet channels 5 is directed into the channel 10, the axial line of which has the shape of a sinusoid (see figure 3). At the vertices 8 and 9 of the zigzags, channel 10 has the smallest areas of live sections. Then, the water flow is directed from the narrowed parts 13 to the expanded parts of the channel 10. When the narrowed part 13 of the channel 10 passes, the water flow is inhibited and the speed is suppressed. When leaving the narrowed part 13 of the channel 10, a stream of water enters its expanded part - a diffuser. In this case, the movement of water becomes turbulent. Repeated braking of irrigation water in the narrowed parts 13 and expanding places between the walls 11 and 12 of the channel 10 leads to a complete damping of the water flow rate. Thus, after the passage of the main dropper 2, the flow of water through the connecting elements 4 enters the secondary dropper 3.

The execution of channel 10 with walls 11 and 12, described by the equations y = arc cos (cos x) and y = arc sin (sin x), eliminates the hanging of mineral debris and suspensions in droppers 2 and 3 and connecting elements 4 due to the absence of angles and sharp transitions.

Another important factor is the simplicity of manufacturing channels 10 in droppers 2 and 3.

After the passage of the narrowed parts 13 and the expanding parts of the channel 10 in the secondary dropper 3 through the outlets 6, it in the form of drops smoothly enters the irrigated surface.

Due to the multiple compression and expansion of the water flow in channels 10 with variable living sections, damping of the flow rate of irrigation water is achieved with minimum dropper lengths 2 and 3.

The described set of essential distinguishing features in the claimed irrigation tube drip irrigation ensure the achievement of the technical result and the task.

Claims (1)

Irrigation tube for drip irrigation, containing a channel for supplying water, made in the form of a labyrinth of a zigzag main and secondary droppers, hydraulically connected by means of connecting elements installed to the vertices of the zigzag, spaced inlet channels and outlets, characterized in that each labyrinth of a zigzag form in the form of a channel with a variable cross-section, one of the continuous side walls has the form described by an equation of the form y = arc cos (cos x), here y and x are the applicate and abscissa of the Cartesian system Topics coordinates OXY, it and the opposed wall has a shape described by an equation of the form y = arc sin (sin x), wherein the channel wall in places narrowing rounded.

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