SU1359489A1 - Borehole pumping unit - Google Patents

Abstract

Invention m. used in water supply, irrigation and land improvement systems, for lifting from wells. The purpose of the invention is to increase reliability. The pipeline 12 communicates the rod and rodless cavity. 6 and 7 of gate 4 through valve 14. Pipeline 13 communicates cavity 6 with a column of lifting pipes 1 by means of a check valve 15 and valve 16. Through a plunger 11. By adjusting the degree of opening of valves 16 and 17, it is possible to provide the required x-r change in flow parameters and to eliminate the possibility of water hammering and sand particles escaping from the well in the column of lifting pipes. 1 il. / 7 00 de

Description

The invention relates to a machinery for the operation of wells, in particular to well pumping installations, and can be used in water supply systems, irrigation and melioration for lifting water from wells.

The purpose of the invention is to increase reliability by eliminating water hammer when starting and stopping the pump.

The drawing schematically shows a well pump installation, a general view,

Well pump installation

contains no pressure associated with the column -ig and limits the speed

pipes 1, a centrifugal pump 2, a back-regulating device 3 with a shutter 4 and its hydraulic actuator 5, having a rod cavity 6 and a rodless cavity 7, which is connected to the discharge valve through a pipe jg of the vent valve 11. pipeline 10, and the plunger 11. The installation is equipped with additional pipelines 12 and 13, and the pipeline 12 is completed by communicating the rod 6 and rodless 7 cavity through the installed, on. It has valve t4, and pipeline 13 - communicating (They have a rod cavity cavity. with a column of lifting pipes 1 by means of a check valve 15 installed on it and a valve 16 through a plunger 11. In this case, pipeline 8, which communicates a cavity 7 without a rod). pipe 10 is additionally equipped with a valve 17, and the shutter 4 - brake damper 18.

Shtokova 6 and besgatokov 7 cavities of the hydraulic actuator 5 of the bolt 4 are separated

When air is completely expelled through the plunger 11 from the column of the riser pipe 1, the pressure smoothly reaches a value greater than the pressure in 25 of the discharge pipe 10. At the same time, the return valve 15 opens, and the check valve 9 closes and the water from the column; lifting pipes 1 through the pipeline 13 enters the rod: 6 and 7 rodless 7 cavity of the hydraulic actuator 5.

The shutter-4 opens in this case under the action of the hydrodynamic forces created by the flow of water and the pressure drop. The pressure in the rodless 7 increases due to the effect on the membrane 19 through the rod 20 of an additional force from the action on the valve 4 hydrostatic and hydro30

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membrane 19. The shutter 4 has a rod 20, 40 dynamic forces. flow v.ody. The return of which is fixed to the piston 21, installed with the possibility of interaction with the sleeve 22 of the brake damper 18. The sleeve 22 is made with a throttle channel 23.

The rod cavity 6 can be connected to the discharge pipe 10 through pipe 24 with a valve 25, and rodless cavity 7 with the column of lifting pipes 1 through pipe 26 with a valve 27. The diaphragm 19 is equipped with a spring 28. The pressure is monitored by a pressure gauge 29.

A well pump installation operates as follows.

When the centrifugal pump 2 is turned off, the shutter 4 is in the closed position; position due to the pressure of water from the injection pipe,

In this case, the valve 15 is closed and the water from the rodless cavity 7 flows into the rod cavity 6 through the valve 24. The opening time of the valve 4 is determined by the degree of opening of the valve 24 and the volume of the rod 6 and rodless 7 cavities, which are chosen based on the condition permissible degree of increase and water flow rate in the well (not indicated). The delay time must have a value that excludes the possibility of occurrence of hydraulic 55 UDZr in the lifting pipe string 1 at the start of the centrifugal pump 2 and the removal of sandy ticles from the well. It also depends on the speed of the air outlet from the column, the lifting pipes.

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10 on the shutter 4 and the force of the spring 28, Shtokova 6 and Besstock 7 - the cavity is filled with water through the pipelines 8 and 12 under the pressure of the discharge pipe 10. The valves 16, 17, 14 and the check valve 9 are open while the valves 25, 27 and the return valve 15 closed.

When the centrifugal pump 2 is started up, the water flow enters the column of lifting pipes 1 and compresses the air there, which, coming out of it through the plunger 11, damps the oscillating filling of the column. The degree of air compression and the rate of its outflow from the column of lifting pipes 1 is determined by the hydraulic resistance of the vent hole 11.

When the air is completely displaced through the plunger 11 from the lifting column of the pipe 1, the pressure smoothly reaches a value greater than the pressure in the discharge pipe 10. At the same time, the return valve 15 opens, and the check valve 9 closes and the water from the column; lifting pipes 1 through the pipeline 13 enters the rod: 6 and 7 rodless 7 cavity of the hydraulic actuator 5.

The shutter-4 opens in this case under the action of the hydrodynamic forces created by the flow of water and the pressure drop. The pressure in the rodless 7 increases due to the action on the membrane 19 through the stem 20 to-. full force from the action; 4 hydrostatic and hydro shutter

monomial forces. flow v.ody. Reverse

In this case, the valve 15 is closed and the water from the rodless cavity 7 flows into the rod cavity 6 through the valve 24. The opening time of the valve 4 is determined by the degree of opening of the valve 24 and the volume of the rod 6 and rodless 7 cavities, which are selected based on the condition the permissible degree of increase and the flow rate of water in the well (not indicated), the delay time must have a value that excludes the possibility of occurrence in the riser pipe 1 of the hydraulic hydraulic ram at the start of the centrifugal pump 2 and the removal of sandy parts itz from the well. It also depends on the speed of the air outlet from the column, the lifting pipes.

Thus, choosing the appropriate diameter of the hole in the plunger 11, the diameters of the additional pipelines 12 and 13, and the degree of opening of the valves 16 and 7, you can ensure the desired nature of the change in flow parameters ..

When the centrifugal pump 2 is stopped, the flow of water begins to flow from the injection pipe 10 to the lifting pipe string 1, the valve 15 is closed at the same time, and the check valve 9 is opened. The shutter 4 is closed by the force of the spring 11 and the forces created by the reverse flow of water into the column of lifting pipes 1. The water pressure in the rod cavity 6 under the force exerted on the membrane 19 transmitted from the shutter 4 through the stem 20 increases and becomes greater than the water pressure rodless cavity 7, which causes the flow of water from the rod 6 into rodless cavity 7 of the hydraulic actuator 5,

The pressure drop arising on the membrane 19 reduces the closing speed of the shutter 4. At a certain part of the stroke, the piston 21 enters the cavity of the sleeve 22 of the brake damper 18 and creates a pressure there, greater than the pressure in the rod cavity 6, due to the fact that the piston 21 is smaller membranes 19 Water from the cavity of the sleeve 22 through the throttle channel 23 flows into the rod cavity b, increasing the pressure there.

Thus, the shutter speed 4 at the last part of the stroke is additionally slowed down by the forces generated by the pressure drop across the piston 21 and the membrane 19, which

59489

eliminates a sharp landing of the bolt 4 on the saddle (not indicated) and the possibility of occurrence as a result of this hydraulic shock of the discharge pipe 10.

If it is necessary to shut off the flow while the centrifugal pump is running, 2 valves 16, 17 and 14 are closed,

10 and valves 25 and 27 open. The valve 4 in this case is closed under the action of the force created by the pressure differential across the membrane 19 between the points of connection of the pipelines 24 and

Claims (1)

15 26 to the column lifting pipe 1 and the discharge pipe 10, the claims of the invention A well pumping installation containing a centrifugal pump connected to a column of lifting pipes, a shut-off and regulating device with a valve and its hydraulic actuator, has a rod cavity ijgtjM, and its free cavity through a pipe with a non-return valve communicates with a steam pipe, and a vent valve characterized in that with In order to increase reliability by eliminating water hammer when starting and stopping the pump, it is equipped with integral pipelines, one of which is connected to the communicating rod and rodless cavities through a valve installed on it, and the other is communicating the rod cavity to the column lifting pipes by means of a check valve and a valve through a plunger, with the pipeline, providing a non-surge-free cavity with a discharge pipe, is additionally equipped with a valve, and the shutter - with a brake damper.