SU926149A1 - Syphon water discharge structure - Google Patents

Description

(5) SIPHONIC WATER BAND.

 /. I

The invention relates to hydraulic engineering, namely, to siphon outlets of hydraulic structures, in particular to pumping stations, where several pumps operate on a single siphon outlet.

A siphon outlet is known, consisting of ascending and descending branches and neck 1}.

The disadvantage of the known siphon is that the siphon cannot be charged with the flow rate of a single pump, therefore, when one pump is running, it is not economical, since the siphon is not charged, the pump head and power consumption are too high, and the output is too low.

A siphon outlet is also known, equipped with a charging outer tube and including upward and downward branches with a bonnet and a crest. , On the hood of the low branch of the siphon

a recess is made, at the apex of which there is a tube connected to the atmosphere for exhausting air. Bubbing is intended to collect air bubbles returning to the throat section of the siphon with a pressure head when the siphon is not full and there is a low speed at the exit 21.

A disadvantage of the known construction is its inefficiency when working with an uncharged siphon, since air bubbles trapped by water may not necessarily return back to the capture zone through the hood.

The purpose of the invention is to increase the efficiency of the siphon.

Claims (2)

This goal is achieved by the fact that the outer charge tube is connected to the inner cavity of the ascending branch at the level of the ridge, and its output is connected to the hood of the descending branch by means of a nozzle with a central with a vertical angle of 8 10 with deviation of the nozzle itself to the downstream . Figure 1 shows the device, the cross section; figure 2 - the same in the plan; Fig. 3 nozzle with a central angle of +0 - 60 °. The siphon outflow consists of an ascending branch 1, a descending wind 2, a ridge 3. An external charge tube 4 at the level of the ridge 3 is attached to the internal cavity of the ascending branch 1. The external charge tube output t is connected to a downhole 5 of the descending branch. 2 by means of a nozzle 6 whose central angle is equal to TSO60. At this m., The axis of the nozzle 6 with the vertical line is equal to 8 –10 with the deviation of the nozzle 6 itself towards the downstream 7 The siphon outflow works as follows. When a single pump is operating on a siphon outlet, designed to skip the total flow rate of several pumps, the water horizon is established over the ridge 3 of the siphon, and downstream branch 2 to the downstream 7 of the discharge channel, the flow is reduced at a speed insufficient to remove air from the siphon It does not create conditions for its charging. Since the inlet of the external charging tube C is at the level of the ridge 3 and flooded with discharge flow, water flows through the external charging tube through the nozzle 6 installed in the cap 5 of the descending branch 2 and 66patHO is poured inside the siphon, freely falling onto the surface of the water existing in the descending branch 2 and equal to the water level of the downstream 7 is diverted from its channel. Since the external charge on the tube C is connected to the hood of the descending branch 2 with a canlon to the side of the lower pool 7 at an angle of 8 10, then the jet discharged has approximately the same angle of incidence. Location of the inset of the external charge catch of the jet into the middle part of the free minimum water surface in the descending branch 2. The purpose of the jet discharged is to create conditions for the intensive capture of air by the water in the internal cavity of the siphon outlet, as well as the flare high velocities directed towards the exit from siphon release and carrying energy sufficient to transport trapped air in water. The removal of air leads to the formation of a negative pressure siphon (vacuum) in the internal cavity, and this reduces the pressure of the pump, increases its performance, which in turn accelerates the charging of the siphon. A charged siphon makes it possible to economically operate a grown-up unit with a higher capacity, with less power and pressure, and consequently, with minimal operating costs and the cost price of the pumped water. Claims of the invention A siphon outlet, equipped with a charging outer tube, comprising upward and downward branches with a bonnet and a ridge, characterized in that, in order to increase its efficiency, the outer charge tube is connected to the inner cavity of the upward branch at the level of the ridge, and its output is connected to the hood of the descending branch by means of a nozzle with a central angle kO - 60, while the axis of the nozzle with the vertical is an angle of 8-10 with the nozzle itself deviating towards the downstream. Sources of information taken into account in the examination 1. USSR author's certificate ff 682592, cl. E 02 B 7/18. 2. USSR author's certificate number 632797, cl. E 02 B 7/18 (prototype).