WO2018141235A1

WO2018141235A1 - Novel constant-pressure constant-speed pump

Info

Publication number: WO2018141235A1
Application number: PCT/CN2018/074503
Authority: WO
Inventors: 邰刘龙; 费小莉
Original assignee: 江苏拓创科研仪器有限公司
Priority date: 2017-02-06
Filing date: 2018-01-29
Publication date: 2018-08-09
Also published as: CN106593803A; CN106593803B

Abstract

The invention provides a novel constant-pressure constant-speed pump. The novel constant-pressure constant-speed pump comprises at least one set of pressurizing assemblies, a drive assembly connected with the pressurizing assemblies, and a liquid guiding assembly. The pressurizing assemblies and the drive assembly are connected with a rack (1). Each pressurizing assembly comprises a cylinder body (2), a plunger rod (3), a pressure cap (4) and a piston mechanism, wherein the plunger rod (3) is in a clearance fit with the corresponding cylinder body (2). The liquid guiding assembly comprises a first pneumatic valve (6), a second pneumatic valve (7), a first joint (8), a second joint (9), a third joint (10) and a fourth joint (11). The novel constant-pressure constant-speed pump has the beneficial effects that cylinder body can be mounted more conveniently and fast, the sealing performance of the pump is improved, and the safety condition of a pressure container under high-pressure liquid can be tested.

Description

A new type of constant pressure and constant speed pump

Technical field

The invention relates to an oil-based experimental instrument, in particular to a constant-speed constant-pressure metering pump.

Background technique

In the process of oil exploitation, high-pressure liquid medium needs to be injected into the ground to take oil from the ground.

The constant pressure and constant speed metering pump is the key equipment in the exploration and development evaluation of petroleum, shale gas and coalbed methane. The feasibility of transporting oil production medium to the oil well is judged by means of laboratory simulation experiments, and the actual mining work is carried out according to the experimental data.

In the experiment, it is necessary to continuously provide a pulseless liquid power source, so a high precision constant pressure and constant speed pump is needed; the existing metering pump has the following defects: 1. The existing metering pump cannot test the high pressure under the ground. The safety condition of a liquid pressure vessel. Second, the sealing condition of the existing metering pump needs to be further improved, so that the measurement accuracy and stability need to be further improved. Third, the existing metering pump cylinder is disassembled and the installation is not convenient enough.

Summary of the invention

The invention provides a novel constant pressure and constant speed pump, which is designed to make the installation of the cylinder of the metering pump more convenient and quick, so that the sealing performance of the metering pump is better, so that the metering pump can test the pressure vessel under the high pressure liquid. Security status.

The present invention provides the following technical solution: a novel constant pressure and constant speed pump comprising at least one set of pressurizing assemblies, a drive assembly coupled to the pressurizing assembly, the pressurizing assembly, the drive assembly and the frame connection The pressurizing assembly includes two groups, and the pressurizing assembly includes a cylinder, a plunger rod, a pressure cap, and a piston mechanism, the plunger rod is in clearance fit with the cylinder, and the piston mechanism Connected to the upper end of the plunger rod, the pressure cap is fixedly connected to the upper end of the cylinder body, the upper end of the cylinder body is plugged with a plug, and the plug is provided with a liquid flow channel, the plug a sealing ring is disposed between the cylinder and the cylindrical outer wall of the pressure cap is provided with a mounting groove; the new constant pressure and constant speed pump further includes a first pneumatic valve, a second pneumatic valve, a first joint, and a first a liquid guiding assembly of a second joint, a third joint, and a fourth joint, wherein the first joint, the second joint, the third joint, and the fourth joint are three-way joints, and the first pneumatic valve and the second pneumatic valve are both Providing a water inlet, a water outlet, a pressurized water port, the first pneumatic valve and the second pneumatic valve The water inlet is connected to the water storage tank pipe through the fourth joint, the new constant pressure and constant speed pump further includes a pressure vessel, and the water outlet of the first pneumatic valve and the second pneumatic valve passes the first A joint is connected to the pressure vessel conduit, and the pressurized water ports of the first pneumatic valve and the second pneumatic valve are respectively connected to the pressurizing assembly pipe through the second joint and the third joint.

The second joint and the third joint are respectively connected with a first pressure sensor and a second pressure sensor.

The piston mechanism includes a piston body, a pan plug, a plug seal, a pan plug upper retaining ring, and a pan plug lower retaining ring, and the pan plug seat is fixedly connected with the upper end of the piston body, and the pan plug seal and the pan Plugging the upper retaining ring and the plugging the lower retaining ring with the piston body, the upper plug upper retaining ring is located below the universal plug seal, and the poppet lower retaining ring is located at the upper plug retaining ring Below.

The driving assembly includes a worm gear reduction device, a ball screw pair including a lead screw and a sleeve, and an upper end of the screw rod is fixedly connected with a lower end of the plunger rod, and the sleeve and the worm wheel of the worm gear reduction device The fixed connection, the worm of the worm gear reduction device is connected to the motor.

The new constant pressure and constant speed pump further includes a guiding assembly including an upper righting, a middle righting, and a guiding rod, wherein the upper righting is fixedly connected with the lower end of the cylinder, and the middle right is fixed to the lower end of the plunger rod Connecting, the upper righting is fixedly connected to the frame, and the upper righting is fixedly connected with the guiding rod, and the central righting is connected with the guiding rod rail.

The driving assembly includes a worm gear reduction device, a ball screw pair including a lead screw and a sleeve, and an upper end of the screw rod is fixedly connected with a lower end of the plunger rod, and the sleeve and the worm wheel of the worm gear reduction device The worm of the worm gear reduction device is connected to the motor, the upper end of the guide rod is fixedly connected to the upper right, and the lower end of the guide rod is fixedly connected with the casing of the worm gear reduction device.

The number of the guide bars is three or four.

The beneficial effects of the present invention are as follows.

1. The outer wall of the cylinder of the pressure cap 4 is provided with a mounting groove 29; the pressure cap 4 makes the connection between the plug 26 and the cylinder 2 more stable, and the function of the mounting groove 29 enables the disassembly and assembly of the pressure cap 4. More convenient and faster. In the dark turn disassembly, only the rod member needs to be inserted into the mounting groove 29, and the lever member can be disassembled and installed. Therefore, the installation of the cylinder of the metering pump is more convenient and quicker.

2. The piston mechanism includes a piston body 30, a pan plug seat 31, a pan plug seal 32, a pan plug upper retaining ring 33, and a pan plug lower retaining ring 5, and the pan plug seat 31 is fixed to the upper end of the piston body 30. Connecting, the pan plug 32, the plug upper retaining ring 33, and the plug lower retaining ring 5 are sleeved with the piston body 30, and the pan plug upper retaining ring 33 is located below the pan plug 32. The lower plug retaining ring 5 is located below the pan plug upper retaining ring 33. The piston mechanism of the above mechanism significantly improves the sealing performance, and the pan seal 32 is used for sealing. The plug seal 32 is a U-type Teflon built-in special spring high-performance seal. The appropriate spring force plus system fluid pressure pushes the seal lip out and gently presses the sealed metal surface to generate very Excellent sealing effect. The actuating effect of the spring overcomes the slight eccentricity of the metal mating surface and the wear of the sealing lip while maintaining the desired sealing performance. Therefore, the sealing condition of the existing metering pump is further improved, so that the measurement accuracy and stability need to be further improved.

The new constant pressure and constant speed pump further includes a liquid flow guiding assembly including a first pneumatic valve 6, a second pneumatic valve 7, a first joint 8, a second joint 9, a third joint 10, and a fourth joint 11, The first joint 8 , the second joint 9 , the third joint 10 , and the fourth joint 11 are three-way joints, and the first pneumatic valve 6 and the second pneumatic valve 7 are respectively provided with a water inlet 12 and a water outlet 13 . The pressurized water port 14, the first pneumatic valve 6 and the water inlet 12 of the second pneumatic valve 7 are connected to the water storage tank 15 through the fourth joint 11, the new constant pressure and constant speed pump further includes a pressure container 16. The water outlets 13 of the first pneumatic valve 6 and the second pneumatic valve 7 are connected to the pressure vessel 16 through the first joint 8, the first pneumatic valve 6 and the second pneumatic valve 7 The pressurized water port 14 is connected to the pressurizing assembly pipe through the second joint 9 and the third joint 10, respectively; the liquid in the water storage tank 15 is transported into the cylinder 2 by the above system, and an experiment is performed. The liquid pipe drawn from the pressurized water port 14 communicates with the tubular body 2, and the pressurized water nozzle 14 is injected into the tubular body 2, and the high pressure liquid inside the tubular body 2 is also returned to the liquid through the pressurized water port 14. Out. Thus, the metering pump is enabled to test the safety condition of the pressure vessel under high pressure liquid.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the driving principle of the novel constant pressure and constant speed pump of the present invention.

2 is a schematic view showing the assembly relationship between the upper right side 23, the middle right side 24, and the guide rod 25.

Fig. 3 is a schematic view of the worm gear reduction device.

4 is a schematic overall view of the novel constant pressure and constant speed pump of the present invention.

Figure 5 is a schematic illustration of a liquid transport system of the novel constant pressure and constant speed pump of the present invention.

Figure 6 is a partial enlarged view of a portion A in Figure 1.

detailed description

The invention is further described below in conjunction with the drawings and specific embodiments.

The reference numerals from Fig. 1 to Fig. 6 are: frame 1, cylinder 2, plunger rod 3, pressure cap 4, pan plug lower retaining ring 5, first pneumatic valve 6, second pneumatic valve 7, first Joint 8, second joint 9, third joint 10, fourth joint 11, water inlet 12, water outlet 13, pressurized water port 14, water storage tank 15, pressure vessel 16, first pressure sensor 17, second pressure sensor 18 , lead screw 19, sleeve 20, worm wheel 21, worm 22, righting 23, central righting 24, guide rod 25, plug 26, liquid flow path 27, sealing ring 28, mounting groove 29, piston body 30, pan plug seat 31 , the plug seal 32, the plug upper retaining ring 33.

A novel constant pressure and constant speed pump comprising at least one set of pressurizing assemblies, a drive assembly coupled to the pressurizing assembly, the pressurizing assembly and the drive assembly being coupled to the frame 1, in the present embodiment The pressurizing assembly is used in two groups, and two sets of pressurized components are used for constant pressure and constant speed experiments, and the efficiency is greatly improved.

The pressurizing assembly includes a barrel 2, a plunger rod 3, a pressure cap 4, and a piston mechanism. The plunger rod 3 is in clearance fit with the barrel 2, and the plunger rod 3 is along the barrel 2 The inner wall performs piston movement, compresses the cylindrical cavity surrounded by the plunger rod 3 and the cylinder 2, and applies a high pressure to the liquid therein.

The piston mechanism is connected to the upper end of the plunger rod 3, the pressure cap 4 is fixedly connected to the upper end of the cylinder body 2, and the upper end of the cylinder body 2 is plugged with a plug 26, the plug 26 A liquid flow path 27 for delivering a high pressure liquid to the cylindrical body 2 is provided. A sealing ring 28 is disposed between the plug 26 and the barrel 2 to improve sealing performance and avoid liquid leakage.

The cylindrical outer wall of the pressure cap 4 is provided with a mounting groove 29; the pressure cap 4 makes the connection between the plug 26 and the cylinder 2 more stable, and the function of the mounting groove 29 makes the removal and installation of the pressure cap 4 more convenient. Fast. In the dark turn disassembly, only the rod member needs to be inserted into the mounting groove 29, and the lever member can be disassembled and installed.

The new constant pressure and constant speed pump further includes a liquid flow guiding assembly including a first pneumatic valve 6, a second pneumatic valve 7, a first joint 8, a second joint 9, a third joint 10, and a fourth joint 11, The first joint 8, the second joint 9, the third joint 10, and the fourth joint 11 are three-way joints, and the first pneumatic valve 6 and the second pneumatic valve 7 are respectively provided with a water inlet 12, a water outlet 13, and a pressurization. The water inlet 14, the first pneumatic valve 6 and the water inlet 12 of the second pneumatic valve 7 are connected to the water storage tank 15 through the fourth joint 11, and the new constant pressure and constant speed pump further includes a pressure container 16, The water outlets 13 of the first pneumatic valve 6 and the second pneumatic valve 7 are connected to the pressure vessel 16 through the first joint 8 , and the first pneumatic valve 6 and the second pneumatic valve 7 are The pressurized water port 14 is connected to the pressurizing assembly pipe through the second joint 9 and the third joint 10, respectively; the liquid in the water storage tank 15 is transported into the cylinder 2 by the above system, and an experiment is conducted. The liquid pipe drawn from the pressurized water port 14 communicates with the tubular body 2, and the pressurized water nozzle 14 is injected into the tubular body 2, and the high pressure liquid inside the tubular body 2 is also returned to the liquid through the pressurized water port 14. Out.

The second joint 9 and the third joint 10 are respectively connected with a first pressure sensor 17 and a second pressure sensor 18. The first pressure sensor 17 and the second pressure sensor 18 are connected to a computer to convert an analog signal into a digital signal. Read the pressure value.

The piston mechanism includes a piston body 30, a damper seat 31, a bulge seal 32, a damper upper retaining ring 33, and a damper lower retaining ring 5, and the damper seat 31 is fixedly connected to the upper end of the piston body 30, The pan plug 32, the upper plug retaining ring 33, and the plug lower retaining ring 5 are sleeved with the piston body 30, and the pan plug upper retaining ring 33 is located below the pan plug 32, the pan The lower retaining ring 5 is located below the upper plug retaining ring 33. The piston mechanism of the above mechanism significantly improves the sealing performance, and the pan seal 32 is used for sealing. The plug seal 32 is a U-type Teflon built-in special spring high-performance seal. The appropriate spring force plus system fluid pressure pushes the seal lip out and gently presses the sealed metal surface to generate very Excellent sealing effect. The actuation effect of the spring overcomes the slight eccentricity of the metal mating surface and the wear of the sealing lip while maintaining the desired sealing performance.

The drive assembly includes a worm gear reduction device, a ball screw pair including a lead screw 19 and a sleeve 20, and the ball screw pair has high guiding precision and low friction damping. The upper end of the lead screw 19 is fixedly connected to the lower end of the plunger rod 3. The sleeve 20 is fixedly connected to the worm wheel 21 of the worm gear reduction device, and the worm 22 of the worm gear reduction device is connected to the motor. The screw 19 is driven by the worm gear reduction device to move up and down, and the plunger rod 3 is driven to squeeze the liquid to create a high pressure environment.

The new constant pressure and constant speed pump further includes a guiding assembly including an upper righting 23, a central righting 24, and a guiding rod 25, the upper right side 23 being fixedly connected with the lower end of the cylinder 2, the central righting 24 and the The lower end of the plunger rod 3 is fixedly connected, the upper right portion 23 is fixedly connected to the frame 1, and the upper right portion 23 is fixedly coupled to the guide rod 25, and the centering right 24 is trajected with the guide rod 25. The structure of the device is made more stable.

The drive assembly includes a worm gear reduction device, a ball screw pair including a lead screw 19 and a sleeve 20, and an upper end of the lead screw 19 is fixedly coupled to a lower end of the plunger rod 3, the sleeve 20 and the worm wheel The worm wheel 21 of the worm gear reduction device is fixedly connected, the worm 22 of the worm gear reduction device is connected to the motor, the upper end of the guide rod 25 is fixedly connected with the upper right portion 23, and the lower end of the guide rod 25 is opposite to the worm gear The housing of the reduction gear is fixedly connected. Make the structure more stable. The number of the guide bars 25 can be three and four.

Claims

A novel constant pressure and constant speed pump comprising at least one set of pressurizing assemblies, a drive assembly coupled to the pressurizing assembly, the pressurizing assembly and the drive assembly being coupled to the frame (1), characterized in that The pressurizing assembly is two sets, and the pressurizing assembly comprises a cylinder (2), a plunger rod (3), a pressure cap (4), a piston mechanism, the plunger rod (3) and the cylinder body ( 2) a clearance fit, the piston mechanism is coupled to the upper end of the plunger rod (3), the pressure cap (4) is fixedly coupled to the upper end of the barrel (2), and the barrel (2) The upper end is plugged with a plug (26), the plug (26) is provided with a liquid flow path (27), and a sealing ring (28) is arranged between the plug (26) and the barrel (2) The cylindrical outer wall of the pressure cap (4) is provided with a mounting groove (29);

The new constant pressure and constant speed pump further includes a first pneumatic valve (6), a second pneumatic valve (7), a first joint (8), a second joint (9), a third joint (10), and a fourth a liquid guiding assembly of the joint (11), the first joint (8), the second joint (9), the third joint (10), and the fourth joint (11) are three-way joints, the first pneumatic valve (6) The second pneumatic valve (7) is provided with a water inlet (12), a water outlet (13), a pressurized water port (14), the first pneumatic valve (6) and the second pneumatic valve (7) The water inlet (12) communicates with the water storage tank (15) through the fourth joint (11), the new constant pressure and constant speed pump further includes a pressure vessel (16), the first pneumatic valve (6) And the water outlet (13) of the second pneumatic valve (7) is in communication with the pressure vessel (16) through the first joint (8), the first pneumatic valve (6) and the second pneumatic valve ( The pressurized water nozzle (14) of 7) is in communication with the pressurizing assembly through the second joint (9) and the third joint (10), respectively;

The second joint (9) and the third joint (10) are respectively connected with a first pressure sensor (17) and a second pressure sensor (18);

The piston mechanism comprises a piston body (30), a plug seat (31), a plug seal (32), a plug upper retaining ring (33), and a plugging lower retaining ring (5), the plug seat (31) a fixed connection with the upper end of the piston body (30), the pan plug seal (32), the plug upper retaining ring (33), the plug lower retaining ring (5) and the piston body (30) The pan plug upper retaining ring (33) is located below the pan seal (32), and the pan plug lower retaining ring (5) is located below the pan plug upper retaining ring (33).
A novel constant pressure and constant speed pump according to claim 1, wherein said drive assembly comprises a worm gear reduction device, a ball screw pair including a lead screw (19) and a sleeve (20), said wire The upper end of the bar (19) is fixedly connected with the lower end of the plunger rod (3), and the sleeve (20) is fixedly connected with the worm wheel (21) of the worm gear reduction device, and the worm of the worm gear reduction device ( 22) Connect to the motor.
A novel constant pressure and constant speed pump according to claim 1, wherein said new constant pressure and constant speed pump further comprises a guide comprising an upper righting (23), a central righting (24), and a guiding rod (25). The upper right side (23) is fixedly connected to the lower end of the cylinder (2), and the middle right side (24) is fixedly connected with the lower end of the plunger rod (3), the upper right side (23) The upper frame (1) is fixedly connected to the frame (1), and the upper right portion (23) is fixedly connected to the guide bar (25). The center right (24) is connected to the guide bar (25).
A novel constant pressure and constant speed pump according to claim 3, wherein said drive assembly comprises a worm gear reduction device, a ball screw pair including a lead screw (19) and a sleeve (20), said wire The upper end of the bar (19) is fixedly connected with the lower end of the plunger rod (3), and the sleeve (20) is fixedly connected with the worm wheel (21) of the worm gear reduction device, and the worm of the worm gear reduction device ( 22) Connected to the motor, the upper end of the guiding rod (25) is fixedly connected with the upper right side (23), and the lower end of the guiding rod (25) is fixedly connected with the housing of the worm gear reducing device.
A novel constant pressure and constant speed pump according to claim 4, characterized in that the number of said guide bars (25) is three.
A novel constant pressure and constant speed pump according to claim 4, characterized in that the number of said guide bars (25) is four.