RU2029025C1 - Gate stabilizing water discharge - Google Patents

Abstract

FIELD: water distributing structure. SUBSTANCE: attached to downstream face by means of vertical ribs is upstream stepped spillway face. Lower edges of faces have curved head and horizontal baffle. Connected to downstream face for vertical motion and locking is water spill plate with curved baffle in upper part directed backward. Water flow under device is stabilized and comes to transit canal, and water flow above curved baffle enters discharge canal with discharge corresponding to the height of curved baffle. EFFECT: higher efficiency. 4 dwg

Description

 The invention relates to hydraulic engineering and can be used to divide the flow of water when installed in a water distribution structure with outlet and transit channels.

 A known water level regulator in an irrigation canal [1], comprising a rod installed inside a sector valve on its flat face and a check valve telescopically connected to one end of the rod, the second end of which is located outside the sector valve and spring-loaded relative to its plane face, and in coastal abutments made a groove located on the trajectory of movement of the second end of the rod.

 The disadvantage of the regulator is the limited range of applications due to the difficulties of dividing the water flow when installed in a water distribution structure with outlet and transit channels.

 Also known is a water flow stabilizer [2], including a box-shaped shield, the front wall of which is stepped and equipped at the bottom with a curved head, and the rear wall contains a horizontal visor, the shield box being divided by vertical ribs into sections along the boundaries of the steps of the front cavity.

 The disadvantage of this stabilizer is also the limited use when dividing the flow of water and installing it on a water distribution structure with outlet and transit channels.

 When operating a water distribution facility, including a section of a transit channel and two outlets, it is often required to provide a constant flow rate of water for transit, and the remaining water should be divided proportionally between the two outlets. It is quite difficult to solve this problem with the well-known constructions of flow stabilizers, since in addition to the device of stabilizers on the transit channel, it is necessary to constantly maneuver the branch shields with changing water flow rates in the supply channel.

 The aim of the invention is the expansion of functionality by dividing the flow of water when installing the shutter-stabilizers of the flow rate of water in a water distribution facility with outlet and transit channels.

 This is achieved by the fact that the shutter-stabilizer of the water flow is equipped with a spillway plate with a curved visor in the upper part, made with a width equal to the width of the body, with the upper edge of the lower edge located at the level of the upper stage of the upper edge, and the plate attached to the lower edge with the possibility of vertical moving and fixing and facing back visor.

 In FIG. 1 shows a cross-sectional shutter-stabilizer of water flow; in FIG. 2 is a section AA in FIG. 1; in FIG. 3 shows a water distribution structure, a plan view, reinforced with flow stabilizer valves; in FIG. 4 is a section BB in FIG. 3.

 The shutter-stabilizer of the flow rate of water consists of the casing of the shutter 1 (rear wall), to which a step wall 3 is welded using vertical ribs 2 from the upstream side. Vertical ribs divide the box into sections 4. At the bottom of the front wall, a curved head 5 is welded, and in the lower part of the back wall there is a horizontal visor 6. A curved visor 7 is attached to the back wall at the mark of the upper face of the central section of the box from the downstream side using removable bolted connections, the spill face of which is approximately wife to the shape of a falling jet. On the sides of the sheathing of the shutter 1, vertical posts 8 are welded, connected by a crossbar 9, to which a cargo screw 10 and a lifting device 11 are attached.

 The water distribution unit (Fig. 3) contains a feed channel 12, two taps 13 and 14 and a tapping channel 15. Culvert holes of the tapping channels are equipped with flow stabilizing valves 16 and 17.

The shutter-stabilizer design provides for operation in the following modes:
a) without overflow into the inner cavity of the box;
b) with overflow into the internal cavity of the box and without overflow through the upper curved visor;
c) with overflow into the inner cavity of the box and through the upper curved visor.

 When the shutter operates in the mode without overflow into the inner cavity of the box, when the pressure in the upper pool does not reach the calculated one (Н <Нр), the outflow occurs as from a conventional flat shutter with increased throughput.

 A curved head 5, the guide of which is as close as possible to the shape of the free surface, provides the maximum value of the velocity coefficient φ = 0.95-0.97 and the vertical compression coefficient ε = 0.95-0.96.

In the mode with overflow of water into the inner cavity of the box, the shutter works as a flow stabilizer in the range of changes in water levels in the upper pool from Np to N _max (Fig. 1). Overflow begins at water levels exceeding the calculated, in the first extreme sections of the box. With an increase in pressure in the upstream, the water flow under the remaining sections increases, and under the first section decreases. The decrease in water flow under the first section is due to the collision of the flow of water flowing from under the curvilinear head 5, and the flow of water when flowing out from under the horizontal visor 6, which leads to a decrease in the flow coefficient μ = 0.51-0.53 . However, the total water flow passing under the stabilizer of the water flow remains almost constant, since the increase in water flow under the remaining sections is compensated by the decrease under the first section. As the pressure increases in the upper pool, the remaining sections are included in the work.

 When the level of the overflow edge of the central section is reached, overflow of water into the internal cavity of the box and through the upper curved visor begins. The shutter simultaneously operates in two modes - as a stabilizer of water flow through the transit channel with the inclusion of all sections of the duct and expiration from under the panel and as a discharge device that allows water to pass through the top of the panel and a curved visor into the discharge channel.

 As part of the water distribution structure, stabilizer gates work as follows.

 When it is necessary to pass water through the transit channel, the stabilizer gates are raised to the upper position, outflow from under the curvilinear heads, and all the water flows through the transit channel.

 In the case when it is necessary to provide a constant flow rate of water through the transit channel, and to divide the excess water proportionally between consumers and supply it to the discharge channels, the stabilizer gates are set to the same openings, and the overflow edges of the upper peaks - to the same marks.

In this case, the values of the overflow layers through the upper edges of the curved visors will be the same, i.e. H ₁ o = H ₂ o = No. With the identical design of the upper visors, their flow coefficients will also be the same, i.e. m ₁ = m ₂ = = m.

 Then the water flow rates of the discharge channels will be proportional to the widths of the working parts of the upper curved visors.

 Water discharged through the upper visors are determined by the spillway formula.

H₁o^3/2
Для второго отвода
Q₂= m₂b

H₂o^3/2
При m₁ = m₂ и Н₁о = Н₂о отношение расходов воды отводов будет равно

=

=

Таким образом, для обеспечения подачи постоянного расхода воды по транзитному каналу и пропорционального вододеления между отводами достаточно установить затворы-стабилизаторы на одинаковые открытия, а переливные кромки верхних криволинейных козырьков - на одинаковые отметки.For the first tap
Q ₁ = m ₁ b

H ₁ o ^3/2
For the second branch
Q ₂ = m ₂ b

H ₂ o ^3/2
When m ₁ = m ₂ and N ₁ about = N ₂ about the ratio of the discharge water discharge will be equal

=

=

Thus, to ensure the supply of a constant flow rate of water through the transit channel and proportional water allocation between the outlets, it is sufficient to set the stabilizer gates to the same openings, and the overflow edges of the upper curved visors to the same marks.

 The ability to move curved visors along the rear wall and their detachable-bolt connection allow the shutter-stabilizers to be transferred to other operating modes. For example, to turn off one of the water consumers, it is enough to move the curved visor to its highest position, which does not allow overflow over its edge.

 Thus, the introduction of a curved visor facing the weir side towards the downstream side, with its attachment at the level of the upper side of the box along its entire width and with the possibility of moving along the back wall, allows expanding the functionality by dividing the water flow when installing the shutter-stabilizers in the water distribution facilities.

Claims (1)

 WATER FLOW STABILIZER-STABILIZER, including a box-shaped sectional housing with a stepped upper spillway face, a flat visor on the lower edge of the lower face and a curved visor on the lower edge of the upper face, characterized in that, in order to expand the functionality by dividing the water flow when installed on water distribution structure with outlet and transit channels, it is equipped with a spillway plate with a curved visor in the upper part, made with a width equal to the width of the body, and the upper edge of the lower edge is located at the level of the upper stage of the upper edge, and the plate is attached to the lower edge with the possibility of vertical movement and fixation and is turned back by the visor.

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