SU1679062A1 - Pump plant - Google Patents

Abstract

The invention relates to hydraulic engineering and can be used for pumping liquids. The invention improves the efficiency by reducing the hydraulic losses for suction and facilitating starting conditions when the liquid level in the avancamera changes. To do this, in a pumping unit comprising a housing 1 an anuster 6 and a knee feed 2, the impeller 5 is equipped with a shell-pontoon 8 with a paternbm device 9. The emergence of the shell-pontoon 8 when the level in the avant-chamber 6 increases, extends the length of the cylindrical section from supply 2 to working wheels 5, where the plot of speeds is leveled. This reduces hydraulic suction losses and increases efficiency. 3 il.

Description

The invention relates to hydraulic engineering and can be used for pumping liquids.

The purpose of the invention is to increase the efficiency by reducing hydraulic losses at the suction and facilitate starting conditions when changing the liquid level in the tank.

Figure 1 shows a pump installation, section; figure 2 - the impeller with a shell-pontoon (packer device is not shown); in Fig.Z - shell-pontoon, top view.

The pump installation includes a vertical cylindrical housing 1 with a knee inlet 2 and a knee bend 3, mounted in the housing 1 on the shaft 4, an axial impeller 5 and in communication with the inlet 6 of the inlet 6. The impeller 5 is equipped with a clutch 7, by means of which it is mounted on the shaft 4 with the possibility of axial movement.

The impeller 5 is also equipped with a pontoon shell 8 with a hollow annular packer device 9 and a system 10 for filling and emptying it with liquid. The shell-pontoon 8 is made covering the impeller 5 and is equipped with a guide apparatus 11 located behind the impeller 5. The shell-pontoon 8 is also equipped with an angular contact bearing 12, covering the clutch 7 and resting on it at the outlet of the guide apparatus 11. Packer device 9 placed between the shell-pontoon 8 and the housing 1.

The system 10 for filling and emptying the packer device 9 may include locking elements 13 and 14 with corresponding channels connecting the hollow packer device 9 with an autonomous pressure system or with the cavity of the housing 1 on the suction and discharge sides. The locking elements 13 and 14 can be controlled remotely.

The pump installation operates as follows.

When the liquid level in the fore chamber 6 changes, the floating shell-pontoon 8 pops up or falls, tracking the level change. Together with the shell-pontoon 8 moves on the shaft 4 of the impeller 5.

To fix the shell-pontoon 8 relative to the housing 1, the hollow packer device 9 is filled with liquid through the system 10 by opening the locking element 13. The locking element 14 is thus closed. The fluid is supplied to the system 10 from an autonomous system or from the discharge side of the pumping unit. Under the influence of excess pressure, the packer device 9 is deformed and abuts against the wall of the cylindrical body 1.

When the shaft 4 is rotated with the impeller 5, fluid is pumped from the chambers 6 through the knee inlet 2 and the knee outlet 3 to the consumer. The equipment of the shell-pontoon 8 with a guiding device 11 provides a decrease in the rotational movement of the liquid behind the impellers and helps to reduce hydraulic losses in the flow part of the installation. Packer device 9 prevents the transmission of torque to the shell-pontoon 8 from the rotating masses of water and seals the gap between the shell-pontoon 8 and the wall of the housing 1.

When the liquid level changes in the chambers 6, the packer device 9 is unlocked. The pressure system is switched off, for example, by closing the shut-off element 13 and opening the shut-off element 14. As a result, the overpressure inside the packer device 9 is released and the shell-pontoon 8 floats or sinks depending on the change in liquid level in the fore chamber 6.

The ascent of the shell-pontoon 8 with increasing liquid level in the tank 6 provides the movement of the impeller 5 upward relative to the housing 1 with the knee supply 2. At the same time, on the suction between the impeller 5 and the knee supply 2, the length of the cylindrical section of the housing 1 increases, where the flow velocity diagram is aligned running onto the impeller. This allows to reduce hydraulic losses at the suction and as a result to increase the efficiency of the pump unit.

When starting up the pumping unit and the unsteady fluid movement associated with the starting processes, due to the ascent of the shell-pontoon 8 with the impeller 5, the back pressure from the discharge side is reduced, which facilitates the start-up conditions and increases the efficiency of the installation.

Claims (1)

Claim A pump installation comprising a vertical cylindrical housing with a knee inlet and a knee bend, an axial impeller mounted in the housing on the shaft and communicated with an inlet chamber, characterized in that, in order to increase efficiency by reducing hydraulic losses on the suction and facilitate starting conditions when the level changes fluid in the fore chamber, the impeller is equipped with an engagement clutch, by means of which it is mounted on the shaft with the possibility of axial movement, and a pontoon shell with a hollow annular packer device and a system for filling and emptying it with liquid, and the shell – pontoon is made covering the impeller, equipped with a guiding device located behind the impeller, and equipped with an angular contact bearing covering 5 coupling and resting against it at the outlet of the guiding device, b the packer device is placed between the pontoon shell and the body.