RU2463480C1 - Hydraulic pump unit - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: working fluid is fed by donkey pump to main pump and discharged therefrom via sole branch pipe. Note here that flow reversal is effected by working fluid with the help of hydraulic control valve. Slide valve of the latter is made up of safety valve, accumulator and reversing element. The latter is made up of barrel fitted on safety valve body to axially displace thereon to communicate main pump with slide valve piston chamber and isolate it therefrom. Slide valve piston chamber is communicated with accumulator working chamber via safety valve orifice. Safety valve body is provided with channels to feed working fluid into reversing element chamber and to discharge it therefrom and to discharge working fluid from slide valve piston chamber.

EFFECT: expanded operating performances, simplified design, higher reliability and efficiency.

8 dwg, 2 cl

Description

The invention relates to hydraulic pumping units and can be used for oil, water and other liquids from wells.

Known hydraulic pumping units according to patent RU 2105193 IPC ⁶ F04B 9/103; RU 2116512 IPC ⁶ F04B 47/08; RU 2166668 IPC ⁷ F04B 47/08; RU 2235907 IPC ⁷ F04B 47/06; RU 2255245 IPC ⁷ F04B 47/08; RU 97106244 IPC ⁶ F04B 47/08; and according to the patent for utility model RU 52125 U1, IPC ⁷ F04B 47/08.

The main disadvantage of these pump units is that the hydraulic drive of these units, in addition to the oil pump, further includes piston or plunger hydraulic cylinders,

The closest in technical essence to the invention is a borehole electro-hydraulic pump unit, including an oil pump (auxiliary pump), a plunger working pump (main pump), a hydraulic motor, the above- and sub-piston cavities of the cylinder which are connected through the distributor to the suction and discharge sides of the oil pump, the cylinder of the plunger working The pump is equipped with a sealed cylindrical diaphragm made of elastic material. Utility Model Patent RU 52125 U1, IPC ⁷ F04B 47/08 of 03/03/2006

The main disadvantage of this pump unit is the use of piston and plunger hydraulic cylinders to create hydraulic oil pressure in the working pump, the use of the stroke of the rod to switch the valve spool, as well as the system of external oil pipelines that increase the diameter. This complicates the design, increases the flow of oil through rod seals and increases energy losses due to the movement of the plunger, creates inertial loads during the reciprocating movement of the plunger and piston, and also leads to their jamming when working in wells of increased curvature.

An additional disadvantage is that the elastic diaphragm works in tension when oil is supplied to it. It also reduces the reliability of the design.

Thus, these shortcomings reduce the reliability of the pumping unit, efficiency and do not allow it to be used in wells of increased curvature.

The objective of the invention is to obtain a technical result, which is expressed in expanding the operating range, simplifying the design, increasing the reliability and efficiency of the pumping unit.

The specified problem in a hydraulic pump installation containing a main pump with a diaphragm in the form of an elastic pipe, an auxiliary pump, a hydraulic distributor and an electric drive, is solved by the fact that the working fluid is supplied by the auxiliary pump to the main pump and is diverted from it through the same pipe, and the flow is reversed is carried out by the working fluid with the help of a control valve, the spool switch of which is made in the form of a safety valve, a hydraulic accumulator and a reversing element, and a reversing valve The element is made in the form of a cup, mounted on the body of the safety valve with the possibility of axial displacement for uncoupling and communication of the main pump with the piston cavity of the spool, which is in communication with the working cavity of the hydraulic accumulator through the throttle hole in the safety valve, and the body of the safety valve is equipped with channels for discharge and supply working fluid in the cavity of the reversing element, as well as the removal of the working fluid from the piston cavity of the spool.

The scientific and technical analysis of the proposal and the prior art indicates that the proposed technical solution for a specialist does not follow explicitly from the prior art, while the features of the set described above are interconnected, are causally related to the expected result, and are necessary and sufficient for it receipt.

The invention is illustrated by drawings, where

figure 1 shows a pump installation in section;

figure 2 shows a fragment of a pump installation in section, including an auxiliary pump and an electric motor with an elastic compensator;

figure 3 shows a fragment of a pump installation in section, including the main pump with an elastic pipe;

figure 4, figure 5 and figure 6 shows a fragment of the pumping unit in the context, including the valve and the valve switch at the time of supply of the working fluid to the main pump; figure 4 shows a section of the frontal plane, figure 5 and figure 6 shows a section of a horizontal plane;

in Fig.7, Fig.8 and Fig.9 shows a fragment of the pumping unit in the context, including the valve and the valve switch at the time of removal of the working fluid from the main pump; in Fig.7 and Fig.8 shows a section of the frontal plane, Fig.9 shows a section of a horizontal plane.

The pump installation shown in Fig. 1 includes a main pump 1 for supplying the pumped liquid to the tubing (not shown), an auxiliary pump 2 with a control valve 3, integrated in the tank 4 and the electric motor 5 with an elastic compensator 6. Elastic compensator 6 ( see Fig. 2) and the tank 4 is filled with a working fluid, for example hydraulic oil, and communicated with each other through the hollow shafts of the auxiliary pump 2 and the electric motor 5. The elastic compensator is equipped with a protective casing 7, made, for example, in the form mesh glass.

The main pump 1 (see figure 3) contains an elastic pipe 8, hermetically mounted on the brackets 9 with the ability to compress the valve tube 10 and displace the pumped fluid through the channels 11 made in the valve tube 10 and the sleeve 12.

The inlet valves 13 provide the pumped fluid to the elastic pipe 8 through the channels 11. The exhaust channels 14 provide the pumped fluid displaced by the elastic pipe 8 to the tubing (not shown). From the axial movement of the brackets 9 and the valve tube 10 are fixed by the head 15 and the base 16, screwed into the housing 17.

The tank 4 is attached to the base 16, which is provided with input channels 18 (shown by a dashed line) for supplying the pumped liquid and channels 19 for supplying the working fluid to the main pump 1 from the auxiliary pump 2 through the supply pipe (outlet) 20.

The control valve 3 (see Fig. 1) contains a housing 21 (see Fig. 4, Fig. 5, Fig. 7 and Fig. 8), in which a two-position valve 22 and its switch 23 are installed to change the direction of flow of the working fluid in main pump and back. The spool 22 is provided with a spring 24 and a latch 25. At the extreme lower position of the spool 22 (see figure 4), the channels 26, 27, 28, 29 of the housing 21 communicate with the pressure pipe 30 (see figure 1) of the auxiliary pump 2 with the main pump 1 and the channels 31, 32, 33, 34 and the throttle 35 (see figure 5) inform the suction pipe 36 (see figure 1) of the auxiliary pump 2 with the tank 4. With the extreme upper position of the spool 22 (see figure 7 and Fig. 8) channels 26, 27, 37, 34 communicate pressure port 30 (see Fig. 1) with tank 4, and channels 31, 38, 28, 29 and throttle 35 (see Fig. 7 and Fig. 8 ) report the suction pipe 36 (see figure 1) at the same time with main pump 1 and tank 4.

The switch 23 of the valve 22 contains a safety valve 39, a hydraulic accumulator 40 (see FIG. 6 and FIG. 9) and a reversing element 41 made in the form of a cup mounted on the housing 42 of the valve 39 with the possibility of axial movement to separate (communicate) the piston cavity of the valve 22 (see FIG. 4, FIG. 5, FIG. 7 and FIG. 8) with the main pump 1 (see FIG. 1). With the lowest position, the reversing element 41 (see Fig. 9) divides the piston cavity of the spool 22 (see Fig. 4, Fig. 5, Fig. 7 and Fig. 8) with the main pump 1 (see Fig. 1). The axial movement of the reversing element is limited by the locking ring 43.

When the safety valve 39 is opened, the working fluid enters through the channel 44 (see Fig. 4 and Fig. 7) into the working cavity of the hydraulic accumulator 40 and the piston cavity of the spool 22. The throttle bore of the valve 39 communicates the working cavity of the hydraulic accumulator 40 with the piston cavity of the spool 22 (see Fig.7 and Fig.8).

The housing 42 of the safety valve 39 is provided with channels 45 (see FIG. 5 and FIG. 6), 46, 47, 48, 49, 50 and 51 (see FIG. 9). Channels 45 (see FIG. 5) communicate the cavity of the reversing element 41 with the main pump via channels 52 and 29 (see FIG. 4 and FIG. 7). Channels 46, 47 and 48 (see Fig. 9) communicate the piston cavity of the spool 22 (see Fig. 4, Fig. 5, Fig. 7 and Fig. 8) with the main pump 1 (see Fig. 1) at the extreme the upper position of the reversing element 41 (see Fig.9). Channels 49, 50 and 51 inform the non-working cavity of the accumulator 40 with the tank 4.

The installation works as follows: when lowering the pump installation (see Fig. 1) into the well, the receiving holes 18 (shown by the dotted line in Fig. 3) are located below the level of the pumped liquid at a depth equal to at least the length of the main pump. In this case, the pumped liquid through the inlet holes 18, inlet valves 13 and channels 11 enters the cavity between the elastic pipe 8 and the valve tube 10. The auxiliary pump 2 (see FIG. 2), driven by the electric motor 5, delivers the working fluid to the main pump 1 (see figure 1). Under the pressure of the working fluid, an elastic pipe 8 (see FIG. 3) compresses the valve tube 10 and squeezes the pumped liquid through the channels 11 and exhaust valves 14 into a tubing (not shown). The supply of working fluid to the main pump is carried out at the lowest position of the spool 22 (see figure 4). In this case, the working fluid from the auxiliary pump 2 (see figure 1) through the pressure pipe 30 passes through the valve 3, through channels 26, 27, 28 and 29 (see figure 4), through the pipe 20 (see figure 3 ) and channels 19. At the same time, the working fluid from the channel 29 (see Fig. 4) enters through the channels 52 and 45 into the cavity of the reversing element 41. The reversing element 41 takes its lowest position and divides the piston cavity of the spool 22 (see Fig. 4, 5, 7 and 8) with the main pump 1 (see figure 1).

When the working fluid is supplied to the main pump, the auxiliary pump 2 (see Fig. 1) pumps it from the tank 4, which communicates with the compensator 6. At the same time, the working fluid enters the suction pipe 36 of the pump 2 through the control valve 3 through channels 34, 33, 32, 31 and throttle 35 (see figure 5).

The safety valve 39 is set to a pressure that is 10% -15% higher than the pressure corresponding to the pressure of the main pump. When the valve tube 10 is fully crimped by the elastic pipe 8 (see Fig. 3), the safety valve 39 (see Fig. 4) opens and the working fluid from the channel 26 passes through the channel 44 into the piston cavity of the spool 22. The clamp 25 of the spool 22 keeps the spool from movement until the working fluid through the throttle hole in the valve 39 fills the working cavity of the accumulator 40. After compressing the spring of the accumulator 40, the pressure of the working fluid becomes sufficient to remove the spool 22 from the retainer 25 and partially open, connecting pressure channel 26 with a drain channel 34. In this case, the pressure of the working fluid drops, and the valve 39 closes. The working fluid from the working cavity of the hydraulic accumulator 40 is pressed by the force of its spring into the piston cavity of the spool 22 and completely opens the spool. The direction of flow of the working fluid to the main pump is reversed.

The working fluid from the main pump 1 enters the suction pipe 36 of the auxiliary pump 2 (see figure 1). The elastic pipe 8 (see figure 3) is straightened. The pumped liquid through the inlet holes 18, inlet valves 13 and channels 11 again fills the cavity between the elastic pipe 8 and the valve tube 10.

The discharge of the working fluid from the main pump is carried out at the highest position of the spool 22 (see Fig.7). In this case, the working fluid to the suction pipe 36 of the auxiliary pump 2 (see Fig. 1) comes simultaneously from the main pump 1 and from the tank 4 through the valve 3 through channels 29, 28, 38, 31 and the throttle 35 (see Fig. 7 and Fig. 8). The throttle 35 provides a permissible low pressure of the working fluid to prevent cavitation. Pumped out by the auxiliary pump 2 (see Fig. 1), the working fluid is supplied to the tank 4 through the pressure pipe 30 and the control valve 3 through channels 26, 27, 37 and 34 (see Fig. 7 and Fig. 8).

As the main pump is emptied, the pressure of the working fluid in the channels 29, 52.45 and in the cavity of the reversing element 41 (see Fig. 7 and Fig. 8) becomes lower than in the tank 4. The reversing element 41 (see Fig. 9) under the action of pressure in the tank 4 is moved to its highest position, and the piston cavity of the spool 22 (see figure 4, figure 5, figure 7 and figure 8) communicates with the main pump 1 (see figure 1). The working fluid from the piston cavity of the valve 22 under the action of the spring 24 is squeezed out into the tank 4 through channels 48, 47, 46, 45 and 52 (see Fig. 7, Fig. 8 and Fig. 9), and the valve moves to its original position. The cycle repeats.

Thus, the invention allows to obtain a technical result, which is expressed in expanding the operating range, simplifying the design, increasing the reliability and efficiency of the pumping unit.

Claims (2)

1. Hydraulic pump unit containing a main pump with a diaphragm in the form of an elastic pipe, an auxiliary pump, a hydraulic distributor with a spool, a spool switch and an electric drive, characterized in that the working fluid is supplied to the main pump by the auxiliary pump and is discharged from it through the same nozzle moreover, the reversal of the flow is carried out by the working fluid using a valve. 2. The hydraulic pumping unit according to claim 1, characterized in that the valve spool switch is made in the form of a safety valve, a hydraulic accumulator and a reversing element, and the reversing element is made in the form of a cup, worn on the body of the safety valve with the possibility of axial movement for separation and communication of the main a pump with a piston cavity of the valve, which is in communication with the working cavity of the accumulator through a throttle hole in the safety valve, and the housing is fuse The valve is equipped with channels for draining and supplying the working fluid to the cavity of the reversing element, as well as draining the working fluid from the piston cavity of the spool.

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