RU2343695C1 - Drip irrigation tube - Google Patents

Abstract

FIELD: agricultural industry; mechanics.

SUBSTANCE: drip irrigation tube consists of a water-supplying channel made in the form of a zigzag-shaped labyrinth, main and secondary drippers hydraulically connected by means of connecting elements installed on the zigzag tops, and spaced inlet channels and water outlets. One of the tops of the zigzag-shaped labyrinth is connected by means of channels to the tops of adjacent zigzag-shaped elements. Connecting channels are conjugated with zigzag channels at an angle of 50÷70°, and external walls of connecting channels are conjugated with internal walls of zigzags along the fillets with the attachment radii more than 200 microns.

EFFECT: uniform supply of irrigation rate in each dripper throughout the pipeline length.

5 dwg

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; the 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 (SU 1501981 A1, 08.23.1989).

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, during the formation process, 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 is driven with a generatrix the contour of 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 on separate irrigation tubes, and the profile contour is formed with fitting welded seams with a cut of not more than 3 mm; the linear speed of the driven drum is 1-5% less than the linear speed of the driving drum (RU 2282534 C1, 08.27.2006).

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 "live 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 bilateral water outlet (RU 2280977 C1, 08/10/2006).

The disadvantages of the described irrigation tube for drip irrigation, adopted by us 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 Each element of the zigzag is given the form shown in FIG. 2, one of the vertices of which is connected by channels to the vertices of adjacent zigzag e ementov while connected channels conjugate with channels zigzag angle 50 ÷ 70 °, and the outer wall of the connecting passages are associated with the inner walls of zigzags fillet radii curvatures greater than 200 microns.

The image 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 zigzags of a D-shaped.

Figure 4 - section bb in figure 3, the cross section of the dropper when applying irrigation water under a working pressure of 0.5 ÷ 4.0 bar.

In Fig.5 - the same, when washing the irrigation pipeline under a pressure of 6 ÷ 8 bar to remove mineral debris.

Information confirming the possibility of implementing the claimed invention are as follows.

Irrigation pipe for drip irrigation contains a channel 1 for supplying water, the main dropper 2, a secondary dropper 3, a connecting element 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 8 and 9.

The main dropper 2 and the secondary dropper 3 are made in the form of a labyrinth of a zigzag shape. Droppers 2 and 3 are hydraulically connected by means of a connecting element 4. The connecting element 4 is mounted to the outer vertices 10 and 11 (see FIG. 2) by a zigzag element.

Each labyrinth of a zigzag shape of the main dropper 2 and the secondary dropper 3 is made in the form of a continuous water supply channel 12 with either a variable or constant live section (see FIGS. 2 and 3). The cross section of the channel 12 can be in the form of either a rectangle (Figs. 4 and 5), or a circle, or an oval, or a deltoid.

Each zigzag element in the elementary region t (see FIG. 2) is given the shape shown in FIG. 2. One of the vertices of the zigzag is connected by channels 13 and 14 with the vertices of adjacent zigzag elements of the shape shown in Fig.2. The connecting channels 13 and 14 are connected with the channels 15 and 16 at an angle β equal to 50 ÷ 70 ° (see figure 2). The outer walls 17 of the connecting channels 13 and 14 are conjugated with the inner walls 18 and 19 of the zigzags along the fillets with radii r (FIG. 3) of curves greater than 200 μm. This condition must be fulfilled for the reason that when preparing irrigation water for drip irrigation systems, the size of the suspension, litter should not exceed 0.2 mm in order to avoid clogging of the channel 12.

Irrigation pipe for drip irrigation works as follows.

Irrigation water enters the channel 1 at a pressure of 0.01 ÷ 0.02 MPa. Due to this, part of the water through the inlet channels 5, located on the top 11 of the zigzags of the channel 12, is sent to the main dropper 2. From the main dropper 2, due to the connecting element 4, the mass of water is sent to the secondary dropper 3. When it completely extinguishes the energy of the water from the secondary dropper 3, it through outlets 6 in the form of drops, it only falls due to gravitational force (flows) onto the surface of the irrigated area.

The laminar flow of irrigation water from the inlet channels 5 is directed to the channel 12, the axial line of which has the form of a sinusoid in series of zigzags connected (see Fig. 2 and 3). At the vertices 10 and 11 of the zigzags, channel 12 has the largest areas of live sections. This ensures the passage of litter with dimensions greater than 0.2 mm. Then, the water flow is directed from the narrowed parts 13 to the expanded parts of the channel 10. When the narrowed part of the channel 12 passes, the water flow is inhibited and the speed is suppressed. When leaving the narrowed part of the channel 12, the flow of water enters its expanded part - the diffuser. In this case, the movement of water becomes turbulent. Repeated braking of irrigation water in narrowed parts and expanding places between the walls 15, 16 and 17 of the channel 12 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 element 4 enters the secondary dropper 3.

The length of the channel 12 in the elementary section t is equal to

at β = 60 °; cos 60 ° = 0.5. Then, on the elementary section t, the length of channel 12 is

Otherwise, the length of the channel 12 is 25-45% less. Thus, with the same length of the main dropper 2 and the secondary dropper 3, excluding clogging of the channel 12 with litter, uniform delivery of irrigation rates along the length of the irrigation tube is achieved.

Claims (1)

Irrigation tube for drip irrigation, containing a water supply channel made in the form of a zigzag labyrinth, a primary and secondary dropper, hydraulically connected by means of connecting elements installed to the zigzag tops, spaced inlet channels and outlets, characterized in that each zigzag element has a shape according to figure 2, one of the vertices of which is connected by channels with the vertices of adjacent zigzag elements, while the connecting channels are associated with the channels of the zigzags at an angle of 50 ÷ 70 °, outer walls connecting channels are associated with the inner walls of the zigzags of the fillet with radius greater than 200 microns restraints.

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