SU533752A1 - Pump station - Google Patents

Description

The invention relates to the field of pumping machine engineering and, moreover, to performance control systems for plants consisting of several pumping units.

A pump is known with a throttle capacity controller installed on its suction line.

When the pump operates, the artificial starvation mode occurs; pump flow is limited by a throttle on the suction line, and the prevention of cavitation modes is provided by bypassing part of the liquid through an additional throttle.

Such a pump cannot be included in the composition of the pumping unit, since it unnecessarily complicates the pumping unit and does not ensure the joint operation of several pumps in the artificial fasting mode.

A pumping station (station) is also known, comprising several pumps with common pressure and suction lines and an automatically controlled throttle element in pressure.

The pumping station operates as follows.

A throttle element with a slide valve, depending on the pressure in its control cavity, sets the hydraulic resistance in the line connecting the pumps, ensuring their synchronous operation during sequential switching on.

This device is closest to the invention in its technical essence and the achieved result.

However, in such a station, the parallel operation of pumps is not possible while regulating their performance.

The aim of the invention is to provide parallel operation of pumps and regulation of their performance.

This goal is achieved by the fact that the throttle element is installed on the suction pipe and communicated with the pumps by pipelines of equal hydraulic resistance.

The drawing shows a diagram of the pumping station.

The pumping station contains high-nano pumps 1 and 2, having a constant geometric working volume, make-up

low pressure pump 3, automatic throttle element 4, safety relief valve 5 and tank 6. Pipelines 7 and 8 have equal hydraulic resistances and connect the suction inlets of pumps 1 and 2 with automatic throttle element 4 and suction pipe 9. Pipelines 10 and 11 Pumps with a pressure pipe 12. Pipe 13 connects the throttle element 4, equipped with a slide 14, with a pressure pipe 12,

To control the pressure on the pipes 7-8 and 12, pressure gauges 15 are embedded.

The balance of the spool 14 is established by the influence of the working pressure of the fluid from the pipe 13 on the end 16 on the one hand, and the force of the adjustment of the spring 17 on the other hand.

The throttle element 4 is designed so that the spool 14 never completely closes the suction pipes 7 and 8. In the lowest position, the spool 14 leaves a gap A (throttle gap) through which the pumps pass the minimum amount of fluid necessary to lubricate the rubbing parts of the pumps and heat dissipation.

In the event that the pressure line of the station is completely blocked (locked), or the flow from pipeline 12 is absent, this liquid is poured into the tank through safety valve 5, and in this mode the station capacity is set to the minimum without overheating the working fluid.

The pumping station operates as follows.

A low pressure feed pump 3 sucks the working fluid from the tank 6 and pumps it into the automatic throttle element 4, from where it flows through the suction piping 7 and 8 to the high-pressure 1 and 2 pumps and the high-pressure hydraulic fluid. by pressure through the pipeline m. 10 and 11 enters the discharge pipe 12 of the pumping station. At the same time, the working fluid under high pressure through the pipeline 13 enters the end 16 of the spool 14 and, upon reaching a pressure close to the target, acts as a piston, lowers the spool 14, compressing the spring 17 while lowering the spool 14, the gap A decreases and forms a throttle the gap. This leads to a decrease in the amount of fluid entering the suction pumps 1 and 2, which reduce the performance at a significant pressure in the pipes 12 and 13.

As the pressure decreases in the pressure pipe. Pipeline 12, the pressure in the pipe 13 accordingly decreases. The spool 14 rises under the action of the spring 17, the gap A increases, and the throttle element

4 increases the access of fluid to the suction piping of pumps 1 and 2. The capacity of the pumps increases, and then the pressure in the pipeline 12 of the pumping station increases. Thus, the throttle element 4, by changing the capacity of the pumps by increasing or decreasing the amount of liquid entering the suction, automatically maintains the pressure in the hydraulic system's discharge line in a given range of values. This range depends on the stiffness of the spring 17.

The pipes 7 and 8, which connect the suction inlets of pumps 1 and 2 with an automatic throttle element, have equal flow resistances. Deviation from this requirement causes unequal division of the fluid between the pumps, overheating, or strong pressure pulsation in one of the

due to possible termination or

reduce the supply of fluid to its suction at

minimum performance. pump station

station.

The use of a pressure-controlled throttle element connected to the suction piping of high-pressure pumps and having equal hydraulic resistances allows the manufacturer of several parallel-running pumps to automatically change to ensure that the pressure in the pressure line is almost constantly maintained; simplify the design of the pumping station and make it convenient and easy to maintain; to increase the speed of the executive mechanisms in the working hydraulic system of the machine.

Claims (1)

Invention Formula A pumping station containing several pumps with common pressure and suction pipes and an automatically controlled pressure throttle element, which, in order to provide parallel operation of the pumps and control their performance, the throttle element is located on the suction pipe and is in communication with the pump pipelines equal hydraulic resistance. head head