Double-acting piston rod cylinder

Abstract

The utility model relates to a double-acting piston rod cylinder, and belongs to the technical field of natural gas production equipment. The double-acting piston rod cylinder comprises a middle cylinder barrel, a cylinder cover, a side cylinder barrel and a guide sleeve, the two ends of the middle cylinder barrel are each provided with a side cylinder barrel through a guide sleeve. The end head of the side cylinder barrel is connected with a cylinder cover; a middle piston is movably arranged in the middle cylinder barrel; side pistons are arranged in the side cylinder barrels; piston rods are arranged at two ends of the middle piston; a piston rod at one end of the middle piston penetrates through the corresponding guide sleeve and then is connected with the side piston in the cylinder barrel on the corresponding side. The double-acting piston rod cylinder is compact in structure and ingenious in design, solves the problem that the service life of an existing gas production pump is affected due to the fact that the instant impact load is large when the existing gas production pump works, and is particularly suitable for use of a drainage gas production pump.

Description

Technical Field

[0001] The utility model relates to a double-acting piston rod cylinder and belongs to the technical field of natural gas production equipment. Background Art

[0002] In the field of oil and gas drainage and production, rodless pumps are often used to complete the drainage and gas production of natural gas; existing gas production pumps, such as the natural gas drainage and gas production pump and its drainage and production system disclosed in the utility model patent application with application publication number CN115822531A, use a plunger pump in conjunction with a three-way valve to control the alternating injection of high-pressure water into the inner and outer cavities of the gas production pump to complete the gas production work. Although the existing technical solutions have met the needs of oil and gas extraction and use to a certain extent, the plunger pump has the characteristics of high pressure and cannot be infinitely adjusted, and the three-way valve completes the switching process in a short time. The instantaneous impact load on the gas production pump during the switching process is very large, so there is a problem that it affects the service life of the gas production pump. Therefore, it is necessary to develop a new water injection device to solve the existing problems that exist in the existing gas production pump. Summary of the invention

[0003] The purpose of the present invention is to provide a double-acting piston rod cylinder with a compact structure and ingenious design to solve the problem that the existing water injection method of the gas pump has a large instantaneous impact load, which affects the service life of the gas pump.

[0004] The technical solution of the utility model is:

[0005] A double-acting piston rod cylinder comprises an intermediate cylinder barrel, a cylinder cover, a side cylinder barrel and a guide sleeve, and is characterized in that: both ends of the intermediate cylinder barrel are equipped with side cylinder barrels through guide sleeves; the end of the side cylinder barrel is connected to the cylinder cover; the intermediate cylinder barrel is movably equipped with an intermediate piston; the side cylinder barrels are equipped with side pistons; the ends of the intermediate piston are equipped with piston rods; the piston rod at one end of the intermediate piston passes through the corresponding guide sleeve and is connected to the side piston in the corresponding side cylinder barrel; a group of side cylinder barrels between the side piston and the cylinder cover are provided with water inlets on the upper part; and a water outlet is provided on the side cylinder barrel below the water inlet.

[0006] The guide sleeve is provided with an oil inlet hole; one end of the oil inlet hole is communicated with the outside; and the other end of the oil inlet hole is communicated with the middle cylinder.

[0007] A displacement sensor is mounted on the cylinder cover at one end of the piston rod cylinder; an avoidance hole is arranged on the piston rod at one side of the displacement sensor; and the displacement sensor is inserted and connected with one end of the avoidance hole.

[0008] The diameter of the avoidance hole is larger than the diameter of the displacement sensor.

[0009] A sealing ring and a dirt-receiving ring are arranged on the circumferential surface of the side piston.

[0010] The advantages of the utility model are:

[0011] The double-acting piston rod cylinder has a compact structure and ingenious design. It can convert hydraulic pressure into water pressure and infinitely adjust the water pressure intensity, thereby solving the problem that the existing gas pump has a large instantaneous impact load when working, which affects the service life of the gas pump. It is particularly suitable for the use of drainage gas pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a simple structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0014] Figure 3 It is a schematic diagram of the working state structure of the utility model;

[0015] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at A in the middle;

[0016] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0017] In the figure: 1. middle cylinder; 2. guide sleeve; 3. side cylinder; 4. cylinder head; 5. middle piston; 6. side piston; 7. piston rod; 8. water inlet; 9. water outlet; 10. oil inlet hole; 11. displacement sensor; 12. avoidance hole; 13. sealing ring; 14. dirt ring; 15. one-way valve A; 16. one-way valve B; 17. one-way valve C. DETAILED DESCRIPTION

[0018] The double-acting piston rod cylinder comprises an intermediate cylinder barrel 1, a cylinder cover 4, a side cylinder barrel 3 and a guide sleeve 2 (see the attached manual). Figure 2 ).

[0019] Both ends of the intermediate cylinder 1 are provided with side cylinders 3 through guide sleeves 2; the ends of the side cylinders 3 are connected with cylinder covers 4; the interior of the intermediate cylinder 1 is provided with intermediate pistons 5; the interior of the side cylinders 3 is provided with side pistons 6; the ends of the intermediate pistons 5 are provided with piston rods 7; the piston rod 7 at one end of the intermediate piston 5 passes through the corresponding guide sleeves 2 and is connected with the side pistons 6 in the corresponding side cylinders 3 (see the attached manual). Figure 2 and 3 ).

[0020] When the middle piston 5 is forced to move back and forth, the middle piston 5 can drive the side pistons 6 to move back and forth through the piston rod 7.

[0021] A water inlet 8 is provided on the upper part of a group of side cylinder barrels 3 between the side piston 6 and the cylinder cover 4; a water outlet 9 is provided on the side cylinder barrel 3 below the water inlet 8. When working, water enters the inside of the corresponding side cylinder barrel 3 through the water inlet 8 and is discharged through the water outlet 9.

[0022] The guide sleeve 2 is provided with an oil inlet hole 10; one end of the oil inlet hole 10 is connected to the outside; the other end of the oil inlet hole 10 is connected to the middle cylinder 1 (see the attached manual). Figure 2 and 4 ). The two groups of oil inlet holes 10 are connected to the external oil pressure system through pipelines. The hydraulic oil can enter and exit the middle cylinder 1 through the oil inlet holes 10. The middle piston 5 can be controlled to move back and forth by controlling the inflow and outflow of the hydraulic oil on both sides of the middle piston 5.

[0023] A displacement sensor 11 is mounted on the cylinder head 4 at one end of the piston rod 7; a clearance hole 12 is provided on the piston rod 7 at one side of the displacement sensor 11; the displacement sensor 11 is inserted and connected to one end of the clearance hole 12. The diameter of the clearance hole 12 is larger than the diameter of the displacement sensor 11 (see the attached manual). Figure 2 and 3 ).

[0024] The purpose of providing the displacement sensor 11 is to detect the operating state of the double-acting piston rod cylinder by detecting the position of the piston rod 7 through the displacement sensor 11 .

[0025] The circumferential surface of the side piston 6 is provided with a sealing ring 13 and a dirt receiving ring 14 (see the appendix of the specification). Figure 4 and 5 The cross section of the dirt receiving ring 14 is U-shaped. The purpose of such a setting is that during the movement of the side piston 6 during operation, the dirt receiving ring 14 can collect the dirt attached to the inner surface of the side cylinder 3 into the U-shaped opening, thereby reducing the risk of dirt damaging the sealing ring 13.

[0026] When the double-acting piston rod cylinder is assembled, the water inlet 8 is connected to the external water supply system through the one-way valve A15; one group of water outlets 9 is connected to the outer chamber of the air pump through the one-way valve B16, and the other group of water outlets 9 is connected to the inner chamber of the air pump through the one-way valve C17 (see the appendix of the manual). Figure 1 ).

[0027] When the double-acting piston rod cylinder is working, the external oil pressure system can control the middle piston 5 to drive the two groups of side pistons 6 to move back and forth continuously by controlling the two groups of oil inlet holes 10 to enter and exit the middle cylinder 1.

[0028] The middle piston 5 drives the two sets of side pistons 6 to move to the right; the side piston 6 on the left side will absorb water from the external water supply system through the one-way valve A15 into the inside of the side cylinder 3 on the left side through the principle of negative pressure adsorption; the side piston 6 on the right side will squeeze the water inside the side cylinder 3 on the right side so that it can enter the inner chamber of the air pump through the one-way valve C17;

[0029] When the middle piston 5 drives the two groups of side pistons 6 to move to the left, the side piston 6 of the right side cylinder 3 will absorb water from the external water supply system through the one-way valve A15 according to the principle of negative pressure adsorption; at the same time, the side piston 6 on the left side will squeeze the water inside the left side cylinder 3 to pass through the one-way valve B16 and the outer chamber of the air pump.

[0030] In this way, during the reciprocating motion of the intermediate piston 5, water can be alternately discharged through the two water outlets 9 to alternately enter the outer chamber and the inner chamber of the air pump to complete the gas collection work.

[0031] In the above process, since the pressure of the hydraulic oil can be infinitely adjusted, the water outlet pressure can also be infinitely adjusted, thereby solving the problem that the existing gas pump has a large instantaneous impact load when working, which affects the service life of the gas pump.

[0032] The double-acting piston rod cylinder has a compact structure and ingenious design. It can convert hydraulic pressure into water pressure and infinitely adjust the water pressure intensity, thereby solving the problem that the existing gas pump has a large instantaneous impact load when working, which affects the service life of the gas pump. It is particularly suitable for the use of drainage gas pumps.

Claims

1. A double-acting piston rod cylinder, comprising an intermediate cylinder barrel (1), a cylinder cover (4), a side cylinder barrel (3) and a guide sleeve (2), characterized in that: Both ends of the intermediate cylinder (1) are provided with side cylinders (3) through guide sleeves (2); the ends of the side cylinders (3) are connected to cylinder covers (4); an intermediate piston (5) is movably provided inside the intermediate cylinder (1); side pistons (6) are provided inside the side cylinders (3); piston rods (7) are provided at both ends of the intermediate piston (5); the piston rod (7) at one end of the intermediate piston (5) passes through the corresponding guide sleeve (2) and is connected to the side piston (6) in the corresponding side cylinder (3); a water inlet (8) is provided on the upper part of a group of side cylinders (3) between the side piston (6) and the cylinder cover (4); and a water outlet (9) is provided on the side cylinder (3) below the water inlet (8).

2. A double-acting piston rod cylinder according to claim 1, characterized in that: The guide sleeve (2) is provided with an oil inlet hole (10); one end of the oil inlet hole (10) is in communication with the outside; the other end of the oil inlet hole (10) is in communication with the middle cylinder (1).

3. A double-acting piston rod cylinder according to claim 1, characterized in that: A displacement sensor (11) is mounted on the cylinder cover (4) at one end of the piston rod (7) cylinder; a relief hole (12) is provided on the piston rod (7) at one side of the displacement sensor (11); and the displacement sensor (11) is inserted and connected to one end of the relief hole (12).

4. A double-acting piston rod cylinder according to claim 3, characterized in that: The diameter of the avoidance hole (12) is larger than the diameter of the displacement sensor (11).

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