SU1216444A1 - Pumping plant - Google Patents

Description

I

The invention relates to a pump construction, in particular, to pumping installations of drainage pumping stations equipped with low-pressure pumps.

The purpose of the invention is to improve the energy performance by reducing the pump head at start-up and at the low water level in the outlet.

1 shows a pump installation, a longitudinal section; on

Fig. 2 shows the diaphragm and control valves;

The pumping unit contains a siphon 1 with downward and ascending branches 2 and 3, a pump 4 located in the upstream branch 3 of the siphon 1, a water outlet 5 connected to the downward branch 2, a diaphragm valve 6 installed between the branches 2 and 3, wherein the submembrane cavity 7 of valve 6 is connected by pipes 8 and 9 to branches 2 and 3 of siphon 1, and the supra membrane cavity 10 is connected to the ascending branch 3 of siphon 1, a control diaphragm valve 11 is inserted into the installation, a pulse tube 12 , drain line 13 and supply tube 14 with throttle 15, supramembrane cavity 16 control diaphragm valve 11 is connected by a drain line 13 with a water line 5, and its sub-membrane cavity 17 is connected to an inlet tube 14 connected to the downward branch 2 and through a choke 1 with a drain line 13, and the above-membrane cavities 10 and 16 valves 6 and 11 are connected by a pulse tube 12, with one of its ends being inserted inside the supermembrane cavity 16 of the control diaphragm valve 11

one

The siphon 1 has a vacuum valve.

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Pump installation works as follows.

When the water level of the outlets 5 is low, the drain line 13 is empty, the control valve membrane 1 is lowered under its own weight, and the cavities 10 and 16 of valves 6 and 11 communicate via the pulse line 12, the Pump 4 is started, and the water fills the sunrise The main branch 3, where it is distributed: the part rises to the siphon 1, and the part through the pipe 8 passes the submembrane cavity 7, through the pipe 9 is discharged into the descending branch 2. Since

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a part of the water is discharged through the diaphragm valve 6 min siphon 1, the resistance of the installation is reduced, which leads to a decrease in starting power, and the pressure of the pump 4 does not extend beyond the working area. Since only part of the water is drained through the siphon 1, the descending branch 2 works as an open tray with a not flooded space, under which the feed pipe 14 is brought upwards.

A minor part of the water is discharged into the supramembrane cavity of the valve 6, and from it through the impulse tube 1 2 into the supermembrane cavity 16 of valve 11 and further through the drain line 13 into the vodovtusk 5,

As the flow rate increases, the pressure loss also increases, which is accompanied by a rise in the water level in the downstream branch 2 and flooding the inlet section of the inlet tube 14. The water fills the subway 25 of the control valve 11 and presses the membrane to the impulse line 12, since the pressure on the membrane from the side of the overmembrane cavity 16 is less than

30 from the side of the submembrane cavity 17. Water leaks through the choke 15 are small and practically do not reduce the pressure in the control diaphragm valve 11,

When the impulse line 12 is closed, the supramembrane cavity 10 is filled with water through a thin tube. In this case, the pressure in the supramembrane cavity 10 is twisted and the membrane of valve 6 gradually lowers

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c, overlapping pipes 8 and 9, When the pressure in the supramembrane cavity 10 is equal to the pressure in pipe 8, the membrane completely overlaps the ends of the pipe 8 and 9, as the force above the membrane exceeds the opposing force from the ends of the pipes 8 and 9,

When the pump unit is stopped, through valve 18, air is injected into the siphon 1 and disrupts the flow in the siphon. The water from the ascending and descending branches is discharged into the pump 4 and the outlet 5, respectively. From the feed pipe 14, the water slowly through the choke 15 is discharged into the discharge line 13, and from there into the water outlet 5.

With a high level of water in the water outlet 5 and the pump 4 being stopped, the water fills the drain line 13, the supermembrane cavity 16 of the valve 11 and, through the pulse line 12, the supermembrane cavity 10 of the valve 6. Tc

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As the pipe 8 is empty, a force acts on the membrane from above, greater than from the bottom on the side of pipe 9. Therefore, the membrane is pressed against the end face 5 of the pipes 8 and 9 and does not allow water to flow into the ascending branch 3 of the siphon 1.

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Editor M.Blanar

Compiled by N.Ivankov Tehred A. Babinets

979/41 Circulation 587 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Branch ShSh Patent, Uzhgorod, st. Project, 4

Proofreader A.T. sko

Claims (1)

A PUMPING UNIT containing a siphon with descending and ascending branches, a pump located in the ascending branch of the siphon, a water outlet connected to the descending branch, a diaphragm valve installed between the branches, while the submembrane cavity of the valve is connected to the tubular cavity connected to the ascending branch of the siphon, characterized in that, in order to improve the energy characteristics by reducing the pump _head% at start-up and low level of water in water outlet, introduced to the plant control diaphragm valve, capillary, cl the main line and the supply pipe with a throttle, the supranembrane cavity of the control diaphragm valve are connected by a drain line to a water outlet, and its sub-membrane cavity is connected to a supply pipe connected to a descending branch and through a throttle to a drain line, and the supra-membrane cavities of the valves are connected by a pulse pipe, with one from its ends, it is inserted into the supmembrane cavity of the governing membrane SU π »1216444 bami with branches of the siphon, and supramampana. Fig 1