SU635168A1 - Water intake for steep canals - Google Patents

Description

one

The proposed invention relates to the field of integrated automation of irrigation systems and can be used to clean water from bottom sediments and to increase the coefficient of non-pumping water intake on the canals of a mountainous area, along which nayos are transported in large numbers and K1 of various sizes during the flood period.

Limestone is a hydraulic water dispenser for canals with large slopes, containing a weir with a hole in the front wall and a discharge pipe, overlapped with a box-shaped shield. The spillway is made of polygonal-nalpoy form, with a sandstone perch 1 built in it.

A disadvantage of this device is that the garment-washing hole has a constant cross section, and the front wall of the weir is frontally flowed. A constant cross section of the washing hole either does not provide a high water intake ratio, or if .and provides a high water intake ratio, it does not miss the sediment of the coarse fraction. The frontal position of the spillway wall to the flow disrupts the structure of the flow by mixing the surface and dry layers, which reduces the effectiveness of the control of bottom sediments.

The purpose of the invention is to increase efficiency.

This is achieved by installing a visor at an angle to the direction of flow that exceeds the distance between the polygonal weirs, which has a peak at one end adjacent to the thresholds, while in the lower part of the visor there is a window with a shutter, and in the downstream channel installed vertical wall.

FIG. 1 shows the proposed water intake, cut; in fig. 2 is the same in nlan.

The water intake contains communicating water intake chambers 1 containing oblique stepped thresholds 2 of variable height and polygonal weirs 3, a vertical thin wall 4, a visor 5, stabilizers 6, discharge channels 7, a large washer 8, an automatic closure 9 with a small washing hole 10.

Water intake works well.

A skewed step threshold of 2 altitudes, causing redistribution of water across the channel, causes transverse circulation to displace bottom sediments to the side of the thin vertical wall 4, which eliminates the mutual influence of two symmetric thresholds located 2. At the same time, the distance from the latter to the vertical thin wall 4, even in the caMOiM narrow place, should be sufficient to allow for the passage of large milking suckers during the steam flow. With minimal water flow in the caa ale, the main part of the lopa stream; it enters the water intake chambers 1, passing through the “cut off” thresholds 2 n part of the polygonal weirs 3. Since the visor 5 has an inclination forward in the water flow, the flow structure is minimally affected , it provides a uniform, non-discontinuous advance of the milk pumps to the washing hole 10. In this mode, the automatic shutter 9 is closed, i.e., the large jib striker 8 is closed, the drift deposits fall into the lower reach through the small washing hole 10 on the shutter 9, and the net by surface water, not income until the end of the visor 5, is drained from it into the water intake chambers 1. Thus, V.S. water, except for the minimum washout floor leaving through the small washing hole, falls into the water intake chambers 1. Ta, k is provided high percentage of water intake and good sediment clearance.

In other modes, the automatic shutter 9 due to the increasing pressure of water on it opens a large flush HHiK 8, which allows you to skip a significant amount of sediment, and the size of a large washbasin 8 should even skip large random sediments associated with floods or rock falls. The slope of the visor 5 forward to the flow of water ensures an unobstructed dumping of the tip, and the structure of the flow saves the structure without mixing the bottom and surface jets. Under these conditions in the intake

Chamber 1 enters surface water, seeded from sediments in the same way as described above, and the excess water goes to the NIZH1NII bay both through polygonal weirs 3 and through the end of the visor 5, which ensures good flow dissipation and energy quenching in the lower reach. The proposed construction, due to the inclination of the visor downstream, will allow for more efficient discharge of sediment from diversion channels 7, does not create a hydraulic eq: wound and, minimally on the flow structure, discharge sediments of even large sizes to the downstream and obtain a high intake factor. The advantage of this facility should be the availability of its inspection and repair, the possibility of introducing it on existing channels, not changing their planned location and direction.

Claims (1)

Invention Formula Water intake for channels with large slopes, containing inlet and outlet canals, intake chambers, skew-directed thresholds, polytonal water lines and flow stabilizers, characterized in that, in order to increase its efficiency, below the direction of flow to the width of the stream, between the polygonal spillways, a visor is installed, which at one end is adjacent to the thresholds, while there is a window with a water gate in the lower part of the visor, and a vertical flow is installed in the inlet channel downstream wall. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 277298, cl. G 05B 5/00, 1970.