WO2007041935A1

WO2007041935A1 - Hydraulic reciprocating pump

Info

Publication number: WO2007041935A1
Application number: PCT/CN2006/002502
Authority: WO
Inventors: Quan Lv; Quanzhang Wang; Jing Shi
Original assignee: Nanjing Quanzhang Hydraulic Power Science And Technology Co., Ltd
Priority date: 2005-10-13
Filing date: 2006-09-25
Publication date: 2007-04-19
Also published as: CN100337031C; CN1752441A

Abstract

There is disclosed a hydraulic reciprocating pump which comprises a reciprocating pump, two power cylinders, a reversing valve, a pump electric unit and a fuel tank with hydraulic oil. The chamber is separated to a hydraulic chamber and a working chamber by the piston in the reciprocating pump. The working chamber is connected into the one-way valve. The liquid is poured fully into the non-piston chamber of the power cylinder which is connected with the hydraulic chamber of the pump body via the pipeline. A control mechanism of the reversing valve is disposed on the power cylinder. The oil inlet of the reversing valve is connected with the pump electric unit and fuel tank successively by the pipeline. Two oil outlets are connected to the chamber with pistons of the power cylinder separately by the pipeline. The backflow port is connected with the fuel tank by the pipeline.The hydraulic reciprocating pump has simple structure, is easy to manufacture and is suitable for many kinds of situations.

Description

Hydraulic reciprocating pump

The present invention relates to a pump, and more particularly to a hydraulic reciprocating pump that utilizes liquid to transfer power. Background technique

A pump is a mechanical device that transports or pressurizes a liquid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, increasing the kinetic energy of the liquid and transporting it along the pipeline. The pumps are mainly used to transport liquids including water, oil, acid and alkali, emulsions, suspoemulsions and liquid metals. They can also transport liquids, gas mixtures and liquids containing suspended solids. According to the working principle, the pump can be divided into positive displacement pump, power pump and other types of pumps, such as jet pump, water hammer pump, electromagnetic pump and gas lift pump.

The positive displacement pump relies on the working element to make a reciprocating or rotating motion in the pump cylinder, so that the working volume is alternately increased and decreased to achieve the suction and discharge of the liquid. A positive displacement pump in which a working element reciprocates is called a reciprocating pump, and a rotary motion is called a rotary pump. The former suction and discharge processes alternate in the same pump cylinder and are controlled by suction and discharge valves; the latter is rotated by working elements such as gears, screws, blade rotors or vanes, forcing liquid from inhalation. The side is transferred to the discharge side. The reciprocating pump is suitable for high pressure and low flow working environments and is widely used in industry and agriculture. The main components of the existing reciprocating pump include: pump cylinder, piston, piston rod, one-way suction valve, one-way discharge valve, generally using electric motor as its motive force, driven by a set of crank linkage mechanism, changing the rotary motion of the motor into a piston Reciprocating motion; or directly driven by a steam engine to reciprocate the piston. However, the reciprocating pump with motor or steam engine as the motive force has a complicated structure and high cost, which limits its further promotion and application. Summary of the invention

1. Object of the Invention: An object of the present invention is to provide a hydraulic reciprocating pump that transfers energy using a liquid to operate a reciprocating pump, which can transmit power over a long distance.

2. Technical Solution: The hydraulic reciprocating pump according to the present invention is characterized in that: it comprises a reciprocating pump, two power cylinders, a reversing valve, a pump motor unit and a fuel tank equipped with hydraulic oil;

The reciprocating pump comprises a pump body having two connected chambers and a piston assembly, the piston assembly being composed of a piston rod and two pistons mounted at two ends of the piston rod, the two pistons being respectively disposed in the two chambers of the pump body In the chamber, the chamber is divided into a hydraulic chamber and a working chamber, and the working chamber is respectively connected with an inlet check valve and an outlet check valve, wherein the inlet check valve is connected with the inlet pipe, and the outlet check valve is connected Connected to the outlet pipe; power cylinder The utility model comprises a cylinder body, a piston and a piston rod, wherein the piston is installed in the cylinder body and divides the cylinder body into a piston rod cavity and a pistonless rod cavity, wherein no piston cavity is filled with liquid and the liquid is respectively connected to the pump body through the pipeline The force chamber is connected, and a control mechanism of the reversing valve is arranged on the power cylinder;

The reversing valve comprises an oil inlet port, two oil outlet ports and a return port, wherein the oil inlet port is sequentially connected with a pump motor unit and a fuel tank for conveying hydraulic oil through a pipeline, and the two oil outlet ports are respectively connected to the power through the pipeline. The cylinder has a piston rod cavity, and the return port is connected to the fuel tank through a pipe.

The control mechanism of the reversing valve is provided with a contact on a piston rod of the power cylinder, and a reversing valve travel switch corresponding to the contact is arranged on the cylinder. If conditions permit, the control mechanism can also be controlled by a computer, integrated circuit or template. The control signals are provided by sensors provided on the power cylinder or the reciprocating pump. These techniques are common technologies and will not be described here. The reversing valve can be Electromagnetic two-position four-way reversing valve, of course, other types of reversing valves can also be used.

In order to prevent the hydraulic oil from over-pressure and damage the reversing valve and the power cylinder, a pilot-type liquid flow valve is connected in parallel between the oil inlet of the reversing valve and the pump motor unit, and the outlet of the pilot-type flow valve is connected to the fuel tank through the pipeline. When the hydraulic oil exceeds the rated pressure, the pilot operated flow valve opens and the hydraulic oil bypass returns to the tank.

An oil filter is connected between the fuel tank and the pump motor unit, the reversing valve, and the pilot-operated flow valve through a pipe to filter out impurities in the hydraulic oil.

Working principle: Referring to Fig. 1, first, the pump motor group 5 is started, the hydraulic oil is sucked into the oil pump by the oil tank 6 through the oil pipe through the oil filter 33, and the pumped high pressure oil enters the electromagnetic two-position four-way reversing valve 4 from the oil inlet port 4 When the electromagnetic 4/2-way reversing valve 4 is de-energized, the high-pressure oil enters the piston rod chamber 24 of the power cylinder 3 through the oil outlet 28. At this time, the piston 22 of the power cylinder 3 descends, and the liquid in the piston-free chamber 26 enters the hydraulic chamber 11 of the reciprocating pump 1 through the pipeline, pushes the piston 9 upward, and simultaneously drives the piston 10 upward, and the volume of the hydraulic chamber 12 of the reciprocating pump 1 When it becomes smaller, the liquid in the hydraulic chamber 12 enters the piston-free cavity 25 of the power cylinder 2 through the pipeline, pushes the piston 21 upward, and the volume of the piston rod chamber 23 of the power cylinder 2 becomes smaller, and the hydraulic oil flows back into the electromagnetic position. The reversing valve 4 flows out of the return port 30 and flows back to the oil tank 6 via the oil filter 33. When the volume of the reciprocating pump 1 is made smaller, the inlet unidirectional width 15 is closed, the outlet check valve 17 is opened, and the water is pumped into the outlet pipe 20, and the volume of the working chamber 14 is made while the volume of the working chamber 13 is reduced. When the liquid discharge check valve 18 is closed, the liquid inlet check valve 16 is opened, and the water enters the work chamber 14 through the liquid inlet pipe 19. When the piston 22 of the cylinder 3 goes to the bottom dead center, the contact 31 touches the travel switch 32, and the electromagnetic two-position four-way switching valve 4 is energized and operated, and the spool moves to the right to change the direction of the oil flow. The oil outlet 29 enters the piston cylinder chamber 23 of the power cylinder 2 to push the piston 21 down, and the volume of the pistonless chamber 25 of the power cylinder 2 becomes smaller, the liquid The hydraulic chamber 12 of the reciprocating pump 1 is introduced through the pipeline to push the piston 10 and drive the piston 9 down. When the piston 9 descends, the volume of the hydraulic chamber 11 becomes smaller, and the liquid enters the piston-free chamber 26 of the power cylinder 3 through the pipeline, and pushes The piston 22 starts to ascend, and the hydraulic oil in the piston rod chamber 24 enters the electromagnetic two-position four-way switching valve 4 through the oil pipe, and flows back to the oil tank 6 by the return port 30 and the oil filter 33. At this time, the volume of the working chamber 13 becomes large, the liquid discharge check valve 17 is closed, the liquid inlet check valve 15 is opened, and the water enters the working chamber 13 through the liquid inlet tube 19; and when the piston 10 descends, the volume of the working chamber 14 is made. When it becomes smaller, the liquid discharge check valve 18 is opened, the liquid inlet check valve 16 is closed, and the water in the work chamber 14 is discharged from the liquid discharge pipe 20 through the liquid discharge check valve 18. When the piston 21 of the power cylinder 2 goes to the bottom dead center, the contact 31 touches the travel switch 32, at which time the electromagnetic two-position four-way switching valve 4 is de-energized, the spool moves to the left to change the oil flow direction, and the oil outlet 29 is out. The oil, the oil outlet 28 is closed, and the electromagnetic 4/2-way switching valve 4 is returned to the initial position. In this way, the cycle is repeated and the process is continuously pumped out.

3. Advantageous Effects: Compared with the prior art, the present invention has the following characteristics: (1) By using a power cylinder, a reversing valve and a pump motor unit, the liquid is used to transfer energy to operate the reciprocating pump, thereby eliminating the need for an electric motor or The steam engine is used as the complex structure of the prime mover; (2) its structure can be either integral or split, and the components can be reasonably set and piped as needed to meet the requirements of different use occasions; (3) The hydraulic reciprocating pump has a variety of uses and can be used for pumping water, underground crude oil, alkali, acid, dirty cement slurry and as a metering pump. (4) The invention can be commercialized in the petroleum industry, and can completely replace the existing beam pumping unit and overcome many disadvantages of the existing pumping unit. (5) Improve efficiency and efficiency. It is applied to the oil pumping unit, which can double the efficiency of the commonly used beam pumping unit, which greatly saves energy. ' Description of the drawings

Figure 1 is a schematic view of the structure of the present invention. detailed description

As shown in Fig. 1, the hydraulic reciprocating pump of the present invention comprises a reciprocating pump 1, two power cylinders 2, 3, a reversing valve 4, a pump motor unit 5, and a fuel tank 6 filled with hydraulic oil;

The reciprocating pump 1 comprises a pump body 7 having two connected chambers and a piston assembly. The piston assembly is composed of a piston rod 8 and two pistons 9, 10 mounted at the ends of the piston rod 8, the two pistons 9, 10 respectively It is disposed in two chambers of the pump body 7, and divides the chamber into the hydraulic chambers 11, 12 and the working chambers 13, 14. The working chambers 13, 14 are respectively connected with the inlet check valves 15, 16 and the liquid outlet Check valve 17, 18, wherein the inlet check valve 15, 16 is connected to the inlet pipe 19, and the outlet check valves 17, 18 are connected to the outlet pipe 20, and the reciprocating pump 1 can be a vertical or horizontal structure;

The power cylinders 2, 3 include a cylinder, pistons 21, 22 and a piston rod, the pistons 21, 22 being mounted in the cylinder and dividing the cylinder into piston rod chambers 23, 24 and pistonless chambers 25, 26, The piston chambers 25 and 26 are filled with liquid and are respectively connected to the hydraulic chambers 11 and 12 of the pump body 7 through pipes. The piston rods of the power cylinders 2 and 3 are provided with contacts 31, which are provided on the cylinder block. a reversing valve stroke switch 32 corresponding to the contact 31;

The reversing valve 4 includes an oil inlet port 27, two oil outlet ports 28, 29 and a return port 30. The oil inlet port 27 is sequentially connected by a pipe to a pump motor unit 5 for conveying hydraulic oil, and an oil filter 33. And the oil tank 6, the two oil outlets 28, 29 are respectively connected to the piston rod chambers 23, 24 of the power cylinders 2, 3 through a pipe, and the return port 30 is connected to the oil filter 33 and the oil tank 6 through pipes in turn.

A pilot-operated flow valve 34 for overpressure protection is connected in parallel between the oil inlet 27 of the reversing valve 4 and the pump motor unit 5, and the outlet of the pilot-type flow valve 34 is sequentially connected to the oil filter 33 and the oil tank 6 through a pipe. .

Claims

Rights request

1. A hydraulic reciprocating pump, characterized in that it comprises a reciprocating pump (1), two power cylinders (2, 3), a reversing valve (4), a pump motor unit (5) and a hydraulic oil a fuel tank (6); wherein - the reciprocating pump (1) comprises a pump body (7) having two connected chambers and a piston assembly, the piston assembly being a piston rod (8) and mounted on the piston rod (8) Two pistons (9, 10) at both ends, two pistons (9, 10) are respectively arranged in the two chambers of the pump body (7), and the chamber is divided into hydraulic chambers (11, 12) and Doing the working chambers (13, 14), the working chambers (13, 14) are respectively connected with the inlet check valves (15, 16) and the outlet check valves (17, 18), wherein the inlet check valves (15, 16) ) connected to the inlet pipe (19), and the outlet check valve (17, 18) is connected to the outlet pipe (20);

The power cylinder (2, 3) comprises a cylinder, a piston (21, 22) and a piston rod, the piston (21, 22) being mounted in the cylinder and dividing the cylinder into a piston rod chamber (23, 24) and There is no piston rod cavity (25, 26), wherein no piston chamber (25, 26) is filled with liquid and connected to the hydraulic chamber (11, 12) of the pump body (7) through the pipeline, respectively, in the power cylinder (2) 3) a control mechanism with a reversing valve (4);

The reversing valve (4) comprises an oil inlet (27), two oil outlets (28, 29) and a return port (30), and the oil inlets (27) are sequentially connected by pipes for conveying hydraulic oil The pump motor unit (5) and the fuel tank (6), the two oil outlets (28, 29) are respectively connected to the piston rod chambers (23, 24) of the power cylinders (2, 3) through the pipes, and the return ports (30) Connect the fuel tank (6) through the pipe.

2. The hydraulic reciprocating pump according to claim 1, wherein: the control mechanism of the reversing valve (4) is provided with a contact (31) on a piston rod of the power cylinder (2, 3), A reversing valve travel switch (32) corresponding to the contact (31) is provided on the cylinder block.

A hydraulic reciprocating pump according to claim 1 or 2, wherein: said reversing valve (4) is an electromagnetic two-position four-way reversing valve.

4. The hydraulic reciprocating pump according to claim 1 or 2, characterized in that: an oil filter is connected between the oil tank (6) and the pump motor unit (5) and the reversing valve (4) through a pipe ( 33).

The hydraulic reciprocating pump according to claim 1 or 2, characterized in that: an overpressure protection is connected in parallel between the oil inlet (27) of the reversing valve (4) and the pump motor unit (5) The pilot operated flow valve (34), the outlet of the pilot operated flow valve (34) is connected to the fuel tank (6) through a pipe.

6. The hydraulic reciprocating pump according to claim 5, characterized in that: an oil filter (33) is connected between the oil tank (6) and the pilot type flow valve (34) through a pipe.