A high pressure oil pipe water hammer eliminator

Abstract

The present invention relates to the technical field of oil and natural gas exploitation, and specifically discloses a high-pressure oil pipe water hammer eliminator, including a lower damping chamber mechanism, an upper damping chamber mechanism and a differential pressure relief mechanism; the lower damping chamber mechanism includes a lower joint, a connecting outer tube, a spiral spring, a lower sealing piston, a lower lip-shaped sealing ring and a lower sealing anti-slip ring; the upper damping chamber mechanism includes an upper sealing piston, an upper lip-shaped sealing ring, an upper sealing anti-slip ring, a wave spring and a center tube; the differential pressure relief mechanism includes a pressure relief inner tube, a pressure relief lower outer tube, a pressure relief value adjustment ring, a V-shaped packing bidirectional seal, a pressure relief spring compression ring, a double-headed stud, a pressure relief valve support spring, a safety valve core, an upper joint and a pressure relief upper outer tube. Two damping chambers with different stiffness are used for shock absorption to reduce the vibration of the pipe string, which can effectively suppress the water hammer pressure fluctuation caused by the large flow changes during well closing and production adjustment, and prevent the pipe string from rupturing.

Description

Technical Field

[0001] The invention relates to the technical field of oil and natural gas exploitation, and in particular to a high-pressure oil pipe water hammer eliminator. Background Art

[0002] At present, the water hammer effect is a pressure wave phenomenon caused by the sudden cessation of fluid or a sharp change in flow rate in the pipeline system. In the process of transporting liquids and gases such as oil and natural gas, if the valve is suddenly closed or the flow rate is changed, a water hammer effect will occur, resulting in pressure waves of different sizes, causing drastic changes in the internal pressure of the oil pipe, and severely damaging the pipeline system and related equipment.

[0003] The prior art CN105612380B provides an axial water hammer arrester; the prior art CN212338570U provides a water hammer arrester; the above two prior arts can reduce or eliminate water hammer phenomenon, reduce pressure waves in the pipeline system, maintain stable operation of the system, extend the service life of pipelines and equipment, and reduce maintenance costs.

[0004] However, the existing technology cannot solve the complex water hammer problem in the oil pipeline, and the pressure bearing capacity is insufficient. Under the conditions of 35MPa to 70MPa, it is easy to cause the pipeline operation system to fail to operate stably, resulting in pipeline rupture. Summary of the invention

[0005] The purpose of the present invention is to provide a high-pressure oil pipe water hammer eliminator, aiming to solve the technical problems in the prior art that the complex water hammer problem in the oil pipe cannot be solved, the pressure bearing capacity is insufficient, the pipeline operation system cannot operate stably, and the pipeline ruptures.

[0006] To achieve the above-mentioned purpose, the present invention adopts a high-pressure oil pipe water hammer eliminator, including a lower shock-absorbing chamber mechanism, an upper shock-absorbing chamber mechanism and a pressure differential safety pressure relief mechanism, wherein the lower shock-absorbing chamber mechanism, the upper shock-absorbing chamber mechanism and the pressure differential safety pressure relief mechanism are connected in sequence from bottom to top; the lower shock-absorbing chamber mechanism includes a lower joint, a connecting outer tube, a spiral spring, a lower sealing piston, a lower lip-shaped sealing ring and a lower sealing anti-slip ring; the upper shock-absorbing chamber mechanism includes an upper sealing piston, an upper lip-shaped sealing ring, an upper sealing anti-slip ring, a wave spring and a center tube; the pressure differential safety pressure relief mechanism includes a pressure relief inner tube, a pressure relief lower outer cylinder, a pressure relief value adjustment ring, a V-shaped packing bidirectional seal, a pressure relief spring pressure ring, a stud, a pressure relief valve support spring, a safety valve core, an upper joint and a pressure relief upper outer cylinder.

[0007] Among them, the lower joint is a long round tube structure, the lower end of the lower joint is provided with a lower joint conical thread, the middle flange of the lower joint is provided with a lower joint external thread 1 connected with the connecting external tube thread, and the upper end of the lower joint is provided with a lower joint external thread 2 connected with the sealing anti-slip ring thread.

[0008] Among them, the connecting outer tube is a long round tube structure, the lower end of the connecting outer tube is provided with a connecting outer tube internal thread 1 connected to the lower joint, the upper and lower ends of the connecting outer tube are respectively arranged with six connecting outer tube guide holes in the circumferential direction, the middle outer wall of the connecting outer tube is provided with six connecting outer tube clamp clamping surfaces in the circumferential direction, and the upper end of the connecting outer tube is provided with a connecting outer tube internal thread 2 connected to the center tube.

[0009] Among them, the lower sealing piston and the upper sealing piston are respectively circular tube structures, and the inner and outer walls of the lower sealing piston and the upper sealing piston are respectively provided with four sealing piston sealing installation grooves for installing the corresponding lower lip sealing ring and the upper lip sealing ring.

[0010] Among them, the lower sealing anti-slip ring and the upper sealing anti-slip ring are open ring structures respectively, the inner walls of the lower sealing anti-slip ring and the upper sealing anti-slip ring are respectively provided with sealing anti-slip ring internal threads, and are respectively connected to the corresponding lower joint and the center tube, and the lower sealing anti-slip ring and the upper sealing anti-slip ring are respectively provided with four sealing anti-slip ring grooves along the circumferential direction.

[0011] Among them, the center tube is a long round tube structure, the lower end of the center tube is provided with a center tube external thread 1 connected to the upper sealing anti-slip ring, the upper end outer wall of the center tube is provided with a center tube external thread 2 connected to the connecting outer tube, and the upper end inner wall of the center tube is provided with a center tube internal thread connected to the pressure relief inner tube.

[0012] Wherein, the pressure relief inner tube is an elongated round tube structure, the lower end of the pressure relief inner tube is provided with a pressure relief inner tube external thread 1 connected to the central tube, the lower part of the pressure relief inner tube is provided with a pressure relief inner tube shoulder, and the two side surfaces of the pressure relief inner tube shoulder are respectively matched with the connecting outer tube and the pressure relief lower outer tube, the upper end of the pressure relief inner tube shoulder is provided with a pressure relief inner tube external thread 2 connected to the pressure relief lower outer tube, the middle part of the pressure relief inner tube shoulder is provided with two groups of pressure relief inner tube pressure transmission holes, and the upper part of the pressure relief inner tube shoulder is provided with a pressure relief inner tube external thread 3 connected to the upper joint;

[0013] The pressure relief lower outer cylinder is a round tube structure, and the inner wall of the lower end of the pressure relief lower outer cylinder is provided with an inner thread of the pressure relief lower outer cylinder connected with the pressure relief inner tube.

[0014] Wherein, the pressure relief value adjustment ring is an annular structure, and six pressure relief value adjustment ring clamping surfaces are arranged in the circumferential direction of the pressure relief value adjustment ring, and the inner wall of the pressure relief value adjustment ring is provided with a pressure relief value adjustment ring internal thread connected with the pressure relief upper outer cylinder, and the upper end of the pressure relief value adjustment ring is provided with a pressure relief value adjustment ring groove and adapted with the pressure relief spring pressure ring;

[0015] The pressure relief spring compression ring is an annular structure, which is composed of the left side of the pressure relief spring compression ring and the right side of the pressure relief spring compression ring connected by the stud, and the left side of the pressure relief spring compression ring and the right side of the pressure relief spring compression ring are both provided with pressure relief spring compression ring mounting holes, and the pressure relief spring compression ring is provided with six pressure relief spring compression ring bosses along the circumference, and the inner wall of the pressure relief spring compression ring is provided with a pressure relief spring compression ring groove and is adapted to the pressure relief value adjustment ring.

[0016] The safety valve core is a circular tube structure, and the inner and outer walls at both upper and lower ends of the safety valve core are provided with safety valve core grooves that are compatible with the V-shaped packing bidirectional seal.

[0017] Wherein, the pressure relief upper outer cylinder is a circular tube structure, the lower end of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder external thread, the lower end outer wall of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder slide groove for cooperating with the pressure relief spring pressure ring boss of the pressure relief spring pressure ring, the upper inner wall circumference of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder boss, the two sides of the pressure relief upper outer cylinder boss are respectively adapted to the safety valve core and the upper joint, the upper circumferential outer wall of the pressure relief upper outer cylinder is provided with six pressure relief upper outer cylinder clamping surfaces, and the upper end inner wall of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder internal thread connected to the upper joint;

[0018] The upper joint is a long round tube structure, the inner wall of the lower end of the upper joint is provided with an upper joint internal thread connected to the pressure relief inner tube, the outer wall of the lower end of the upper joint is provided with an upper joint external thread connected to the pressure relief upper outer tube, and the upper end of the upper joint is provided with an upper joint tapered thread.

[0019] A high-pressure oil pipe water hammer eliminator of the present invention has the following beneficial effects:

[0020] 1. The annular fluid compression chamber ensures that the water hammer eliminator can be lowered into the well to function;

[0021] 2. Vibration is reduced by using two damping chambers with different stiffness. The lower damping chamber adopts the spiral spring with small elastic modulus to absorb energy, which can effectively suppress the pressure fluctuation caused by transient flow in the pipe and reduce the vibration of the pipe string. The upper damping chamber adopts the wave spring with large stiffness to effectively suppress the water hammer pressure fluctuation caused by the large flow change during well shut-in and production adjustment.

[0022] 3. When water hammer occurs, excessive pressure in the pipe will push the valve core of the safety valve to open, thereby releasing pressure and preventing the pipe from rupturing;

[0023] 4. The pressure relief pressure can be adjusted by the pressure relief value adjustment ring, and the pressure can be adjusted according to the pipes with different structural strengths to ensure the safety of the pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 The utility model is a cross-sectional view of the internal structure of a high-pressure oil pipe water hammer eliminator of the present invention.

[0026] Figure 2 It is a partial structural schematic diagram of the lower shock absorbing chamber mechanism of the present invention.

[0027] Figure 3 It is a partial structural schematic diagram of the upper shock absorbing chamber mechanism of the present invention.

[0028] Figure 4 It is a partial structural schematic diagram of the pressure differential safety pressure relief mechanism of the present invention.

[0029] Figure 5 It is a half-section view of the lower joint of the present invention.

[0030] Figure 6 It is a half-section view of the connecting outer tube of the present invention.

[0031] Figure 7 It is a half-section view of the lower sealing piston of the present invention.

[0032] Figure 8 It is a half-section view of the lower sealing anti-slip ring of the present invention.

[0033] Fig. 9 It is a half-section view of the center tube of the present invention.

[0034] Fig.10 It is a half-section view of the pressure relief inner tube of the present invention.

[0035] Fig.11 It is a half-section view of the pressure relief lower outer cylinder of the present invention.

[0036] Fig.12 It is a half-section view of the pressure relief value adjustment ring of the present invention.

[0037] Fig.13 It is a half-section view of the pressure relief spring compression ring of the present invention.

[0038] Fig.14 It is a half-section view of the safety valve core of the present invention.

[0039] Fig.15 It is a half-section view of the pressure relief upper outer cylinder of the present invention.

[0040] Fig.16 It is a half-section view of the upper joint of the present invention.

[0041] 1-lower damping chamber mechanism, 2-upper damping chamber mechanism, 3-pressure differential safety pressure relief mechanism, 4-lower joint, 5-connecting outer tube, 6-helical spring, 7-lower sealing piston, 8-lower lip seal ring, 9-lower sealing anti-slip ring, 10-upper sealing piston, 11-upper lip seal ring, 12-upper sealing anti-slip ring, 13-wave spring, 14-center tube, 15-pressure relief inner tube, 16-pressure relief lower outer tube, 17-pressure relief value adjustment ring, 18-V-type packing two-way seal , 19-pressure relief spring pressure ring, 20-double-headed stud, 21-pressure relief valve support spring, 22-safety valve core, 23-upper joint, 24-pressure relief upper outer tube, 25-lower joint tapered thread, 26-lower joint external thread 1, 27-lower joint external thread 2, 28-connecting external pipe internal thread 1, 29-connecting external pipe flow guide hole, 30-connecting external pipe clamp holding surface, 31-connecting external pipe internal thread 2, 32-sealing piston seal installation groove, 33-sealing anti-slip ring internal thread , 34-seal anti-drop ring groove, 35-center tube external thread 1, 36-center tube external thread 2, 37-center tube internal thread, 38-pressure relief inner tube external thread 1, 39-pressure relief inner tube shoulder, 40-pressure relief inner tube external thread 2, 41-pressure relief inner tube pressure transmission hole, 42-pressure relief inner tube external thread 3, 43-pressure relief lower outer tube internal thread, 44-pressure relief value adjustment ring fixture clamping surface, 45-pressure relief value adjustment ring internal thread, 46-pressure relief value adjustment ring groove, 47-pressure relief The left side of the pressure spring pressure ring, 48-the right side of the pressure relief spring pressure ring, 49-the mounting hole of the pressure relief spring pressure ring, 50-the boss of the pressure relief spring pressure ring, 51-the groove of the pressure relief spring pressure ring, 52-the groove of the valve core of the safety valve, 53-the external thread of the pressure relief upper outer tube, 54-the slide groove of the pressure relief upper outer tube, 55-the boss of the pressure relief upper outer tube, 56-the clamping surface of the pressure relief upper outer tube, 57-the internal thread of the pressure relief upper outer tube, 58-the internal thread of the upper joint, 59-the external thread of the upper joint, 60-the tapered thread of the upper joint. DETAILED DESCRIPTION

[0042] See also Figures 1 to 16The present invention provides a high-pressure oil pipe water hammer eliminator, comprising a lower damping chamber mechanism 1, an upper damping chamber mechanism 2 and a differential pressure safety pressure relief mechanism 3, wherein the lower damping chamber mechanism 1, the upper damping chamber mechanism 2 and the differential pressure safety pressure relief mechanism 3 are sequentially connected from bottom to top; the lower damping chamber mechanism 1 comprises a lower joint 4, a connecting outer tube 5, a spiral spring 6, a lower sealing piston 7, a lower lip sealing ring 8 and a lower sealing anti-slip ring 9; the upper damping chamber mechanism 2 comprises an upper sealing piston 10, an upper lip sealing ring 11, an upper sealing anti-slip ring 12, a wave spring 13 and a center tube 14; the differential pressure safety pressure relief mechanism 3 comprises a pressure relief inner tube 15, a pressure relief lower outer tube 16, a pressure relief value adjustment ring 17, a V-type packing bidirectional seal 18, a pressure relief spring pressure ring 19, a stud 20, a pressure relief valve support spring 21, a safety valve core 22, an upper joint 23 and a pressure relief upper outer tube 24.

[0043] Furthermore, the lower joint 4 is a long round tube structure, the lower end of the lower joint 4 is provided with a lower joint conical thread 25, the middle flange of the lower joint 4 is provided with a lower joint external thread 1 26 which is threadedly connected to the connecting outer tube 5, and the upper end of the lower joint 4 is provided with a lower joint external thread 27 which is threadedly connected to the sealing anti-slip ring.

[0044] Furthermore, the connecting outer tube 5 is a long circular tube structure, and the lower end of the connecting outer tube 5 is provided with a connecting outer tube internal thread 28 connected to the lower joint 4, and six connecting outer tube guide holes 29 are arranged respectively at the upper and lower ends of the connecting outer tube 5 in the circumferential direction, and six connecting outer tube clamp clamping surfaces 30 are provided in the circumferential direction of the middle outer wall of the connecting outer tube 5, and the upper end of the connecting outer tube 5 is provided with a connecting outer tube internal thread 2 31 connected to the center tube 14.

[0045] Furthermore, the lower sealing piston 7 and the upper sealing piston 10 are respectively of circular tube structures, and the inner and outer walls of the lower sealing piston 7 and the upper sealing piston 10 are respectively provided with four sealing piston sealing installation grooves 32 for installing the corresponding lower lip sealing ring 8 and the upper lip sealing ring 11.

[0046] Furthermore, the lower sealing anti-slip ring 9 and the upper sealing anti-slip ring 12 are open ring structures respectively, and the inner walls of the lower sealing anti-slip ring 9 and the upper sealing anti-slip ring 12 are respectively provided with sealing anti-slip ring internal threads 33, and are respectively connected to the corresponding lower joint 4 and the center pipe 14, and the lower sealing anti-slip ring 9 and the upper sealing anti-slip ring 12 are respectively provided with four sealing anti-slip ring grooves 34 along the circumferential direction.

[0047] Furthermore, the center tube 14 is an elongated round tube structure, the lower end of the center tube 14 is provided with a center tube external thread 1 35 connected to the upper sealing anti-slip ring 12, the upper end outer wall of the center tube 14 is provided with a center tube external thread 2 36 connected to the connecting outer tube 5, and the upper end inner wall of the center tube 14 is provided with a center tube internal thread 37 connected to the pressure relief inner tube 15.

[0048] Further, the pressure relief inner tube 15 is an elongated round tube structure, the lower end of the pressure relief inner tube 15 is provided with a pressure relief inner tube external thread 1 38 connected to the central tube 14, the lower part of the pressure relief inner tube 15 is provided with a pressure relief inner tube shoulder 39, and the two side surfaces of the pressure relief inner tube shoulder 39 are respectively matched with the connecting outer tube 5 and the pressure relief lower outer tube 16, the upper end of the pressure relief inner tube shoulder 39 is provided with a pressure relief inner tube external thread 2 40 connected to the pressure relief lower outer tube 16, the middle part of the pressure relief inner tube shoulder 39 is provided with two groups of pressure relief inner tube pressure transmission holes 41, and the upper part of the pressure relief inner tube shoulder 39 is provided with a pressure relief inner tube external thread 3 42 connected to the upper joint 23;

[0049] The pressure relief lower outer cylinder 16 is a round tube structure, and the inner wall of the lower end of the pressure relief lower outer cylinder 16 is provided with a pressure relief lower outer cylinder internal thread 43 connected to the pressure relief inner tube 15 .

[0050] Furthermore, the pressure relief value adjustment ring 17 is an annular structure, and six pressure relief value adjustment ring clamp holding surfaces 44 are provided in the circumferential direction of the pressure relief value adjustment ring 17, and the inner wall of the pressure relief value adjustment ring 17 is provided with a pressure relief value adjustment ring internal thread 45 connected to the pressure relief upper outer cylinder 24, and the upper end of the pressure relief value adjustment ring 17 is provided with a pressure relief value adjustment ring groove 46 and adapted to the pressure relief spring pressure ring 19;

[0051] The pressure relief spring compression ring 19 is an annular structure, which is composed of a pressure relief spring compression ring left side 47 and a pressure relief spring compression ring right side 48 connected by the stud 20. The pressure relief spring compression ring left side 47 and the pressure relief spring compression ring right side 48 are both provided with a pressure relief spring compression ring mounting hole 49. The pressure relief spring compression ring 19 is provided with six pressure relief spring compression ring bosses 50 along the circumference. The inner wall of the pressure relief spring compression ring 19 is provided with a pressure relief spring compression ring groove 51 and is adapted to the pressure relief value adjustment ring 17.

[0052] Furthermore, the safety valve core 22 is a circular tube structure, and the inner and outer walls of the upper and lower ends of the safety valve core 22 are provided with safety valve core grooves 52 that are compatible with the V-shaped packing bidirectional seal 18 .

[0053] Further, the pressure relief upper outer cylinder 24 is a circular tube structure, the lower end of the pressure relief upper outer cylinder 24 is provided with a pressure relief upper outer cylinder external thread 53, the lower end outer wall of the pressure relief upper outer cylinder 24 is provided with a pressure relief upper outer cylinder slide groove 54 for cooperating with the pressure relief spring compression ring boss 50 of the pressure relief spring compression ring 19, the upper inner wall circumference of the pressure relief upper outer cylinder 24 is provided with a pressure relief upper outer cylinder boss 55, the two sides of the pressure relief upper outer cylinder boss 55 are respectively adapted to the safety valve core 22 and the upper joint 23, the upper circumferential outer wall of the pressure relief upper outer cylinder 24 is provided with six pressure relief upper outer cylinder clamp clamping surfaces 56, the upper end inner wall of the pressure relief upper outer cylinder 24 is provided with a pressure relief upper outer cylinder internal thread 57 connected to the upper joint 23;

[0054] The upper joint 23 is a long round tube structure. The inner wall of the lower end of the upper joint 23 is provided with an upper joint internal thread 58 connected to the pressure relief inner tube 15. The outer wall of the lower end of the upper joint 23 is provided with an upper joint external thread 59 connected to the pressure relief upper outer tube 24. The upper end of the upper joint 23 is provided with an upper joint tapered thread 60.

[0055] In this embodiment, the lower joint 4 is arranged at one end of the connecting outer tube 5, the coil spring 6 is sleeved on the outer wall of the lower joint 4 and embedded in the inner part of the connecting outer tube 5, the lower sealing piston 7 is sleeved on the outer wall of the lower joint 4 and located at one end of the coil spring 6, the number of the lower lip sealing rings 8 is multiple groups, each group of the lower lip sealing rings 8 is respectively adapted to the lower sealing piston 7, the lower sealing anti-slip ring 9 is arranged at one end of the lower joint 4 and located at the connecting outer tube 5. The inner part of the tube 5, the central tube 14 is threadedly connected with the connecting outer tube 5 and embedded in the inner part of the connecting outer tube 5, the wave spring 13 is sleeved on the outer wall of the central tube 14 and embedded in the inner part of the connecting outer tube 5, the upper sealing piston 10 is sleeved on the outer wall of the central tube 14 and is located at one end of the wave spring 13, the number of the upper lip sealing ring 11 is multiple groups, each group of the upper lip sealing ring 11 is respectively adapted to the upper sealing piston 10, and the upper sealing anti-slip ring 12 is provided. The pressure relief inner tube 15 is threadedly connected to the center tube 14 and is located at one end of the center tube 14. The pressure relief lower outer tube 16 is threadedly connected to the pressure relief inner tube 15 and is sleeved on the outer wall of the pressure relief inner tube 15. The pressure relief upper outer tube 24 is sleeved on the outer wall of the pressure relief lower outer tube 16. The safety valve core 22 is arranged between the pressure relief inner tube 15 and the pressure relief lower outer tube 16. The number of the V-type packing bidirectional seals 18 is multiple groups, and each group of the V-type packings The two-way seals 18 are respectively sleeved on the inner and outer sides of the safety valve core 22, the pressure relief valve support spring 21 is arranged between the safety valve core 22 and the pressure relief upper outer tube 24, the pressure relief value adjustment ring 17 is sleeved on the outer wall of the pressure relief upper outer tube 24, the pressure relief spring compression ring 19 is arranged at one end of the pressure relief value adjustment ring 17, the stud 20 is arranged at one end of the pressure relief spring compression ring 19, and the upper joint 23 is arranged at one end of the pressure relief upper outer tube 24 and the pressure relief inner tube 15.

[0056] When using a high-pressure oil pipe water hammer eliminator of the present invention, the lower joint 4 and the upper joint 23 are respectively connected to the casing at both ends and are lowered into the well together with the casing;

[0057] When the flow condition of the fluid in the pipe changes slightly, the fluid pressure starts to rise and pushes the lower sealing piston 7 in the lower damping chamber mechanism 1, further compressing the coil spring 6 to absorb energy, thereby reducing the amplitude of the pressure fluctuation of the fluid in the pipe and reducing the vibration of the pipe string system;

[0058] When the flow conditions of the fluid in the pipe change significantly, the fluid pressure starts to rise, pushing the upper sealing piston 10 in the upper damping chamber mechanism 2 to further compress the wave spring 13 to absorb energy, thereby reducing the fluctuation amplitude of the fluid pressure in the pipe and reducing the vibration of the pipe string system;

[0059] When the additional pressure generated by the water hammer effect in the pipe continues to rise and exceeds the internal pressure resistance of the pipe, when the internal pressure is much greater than the external pressure, the safety valve core 22 moves downward. At this time, the inside and outside of the pipe can be connected through the pressure relief upper outer cylinder slide groove 54, thereby achieving pressure relief, and driving the pressure relief value adjustment ring 17 and the pressure relief spring compression ring 19 to move, thereby achieving pressure regulation of pressure relief and preventing the pipe string from rupture.

[0060] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A high-pressure oil pipe water hammer eliminator, characterized in that: It includes a lower damping chamber mechanism, an upper damping chamber mechanism and a differential pressure relief mechanism, wherein the lower damping chamber mechanism, the upper damping chamber mechanism and the differential pressure relief mechanism are connected in sequence from bottom to top; the lower damping chamber mechanism includes a lower joint, a connecting outer tube, a spiral spring, a lower sealing piston, a lower lip sealing ring and a lower sealing anti-slip ring; the upper damping chamber mechanism includes an upper sealing piston, an upper lip sealing ring, an upper sealing anti-slip ring, a wave spring and a center tube; the differential pressure relief mechanism includes a pressure relief inner tube, a pressure relief lower outer tube, a pressure relief value adjustment ring, a V-shaped packing bidirectional seal, a pressure relief spring pressure ring, a stud, a pressure relief valve support spring, a safety valve core, an upper joint and a pressure relief upper outer tube; The lower joint is arranged at one end of the connecting outer tube, the coil spring is sleeved on the outer wall of the lower joint and embedded in the interior of the connecting outer tube, the lower sealing piston is sleeved on the outer wall of the lower joint and located at one end of the coil spring, the number of the lower lip-shaped sealing rings is multiple, and each group of the lower lip-shaped sealing rings is respectively adapted to the lower sealing piston, the lower sealing anti-slip ring is arranged at one end of the lower joint and is located in the interior of the connecting outer tube, the center tube is threadedly connected to the connecting outer tube and embedded in the interior of the connecting outer tube, the wave spring is sleeved on the outer wall of the center tube and embedded in the interior of the connecting outer tube, the upper sealing piston is sleeved on the outer wall of the center tube and located at one end of the wave spring, the number of the upper lip-shaped sealing rings is multiple, and each group of the upper lip-shaped sealing rings is respectively adapted to the upper sealing piston, the upper sealing The sealing and anti-slipping ring is arranged at one end of the central tube, the pressure relief inner tube is threadedly connected to the central tube and is located at one end of the central tube, the pressure relief lower outer tube is threadedly connected to the pressure relief inner tube and is sleeved on the outer wall of the pressure relief inner tube, the pressure relief upper outer tube is sleeved on the outer wall of the pressure relief lower outer tube, the safety valve core is arranged between the pressure relief inner tube and the pressure relief lower outer tube, the number of the V-shaped packing bidirectional seals is multiple groups, and each group of the V-shaped packing bidirectional seals is respectively sleeved on the inner and outer sides of the safety valve core, the pressure relief valve support spring is arranged between the safety valve core and the pressure relief upper outer tube, the pressure relief value adjusting ring is sleeved on the outer wall of the pressure relief upper outer tube, the pressure relief spring pressure ring is arranged at one end of the pressure relief value adjusting ring, the stud is arranged at one end of the pressure relief spring pressure ring, and the upper joint is arranged on the pressure relief upper outer tube and one end of the pressure relief inner tube.

2. A high-pressure oil pipe water hammer eliminator as claimed in claim 1, characterized in that: The lower joint is a long round tube structure, the lower end of the lower joint is provided with a lower joint tapered thread, the middle flange of the lower joint is provided with a lower joint external thread 1 connected to the connecting external tube thread, and the upper end of the lower joint is provided with a lower joint external thread 2 connected to the sealing anti-slip ring thread.

3. A high-pressure oil pipe water hammer eliminator as claimed in claim 1, characterized in that: The connecting outer tube is a long round tube structure, the lower end of the connecting outer tube is provided with a connecting outer tube internal thread 1 connected to the lower joint, the upper and lower ends of the connecting outer tube are respectively provided with six connecting outer tube flow guide holes along the circumferential direction, the middle outer wall of the connecting outer tube is provided with six connecting outer tube clamp clamping surfaces in the circumferential direction, and the upper end of the connecting outer tube is provided with a connecting outer tube internal thread 2 connected to the center tube.

4. A high-pressure oil pipe water hammer eliminator as claimed in claim 1, characterized in that: The lower sealing piston and the upper sealing piston are respectively of circular tube structure, and the inner and outer walls of the lower sealing piston and the upper sealing piston are respectively provided with four sealing piston sealing installation grooves for installing the corresponding lower lip sealing ring and the upper lip sealing ring.

5. The high-pressure oil pipe water hammer eliminator according to claim 1, characterized in that: The lower sealing anti-slip ring and the upper sealing anti-slip ring are respectively open ring structures, and the inner walls of the lower sealing anti-slip ring and the upper sealing anti-slip ring are respectively provided with sealing anti-slip ring internal threads, and are respectively connected to the corresponding lower joint and the center pipe, and the lower sealing anti-slip ring and the upper sealing anti-slip ring are respectively provided with four sealing anti-slip ring grooves along the circumferential direction.

6. A high-pressure oil pipe water hammer eliminator as claimed in claim 1, characterized in that: The center tube is a long round tube structure, the lower end of the center tube is provided with a center tube external thread 1 connected to the upper sealing anti-slip ring, the upper end outer wall of the center tube is provided with a center tube external thread 2 connected to the connecting outer tube, and the upper end inner wall of the center tube is provided with a center tube internal thread connected to the pressure relief inner tube.

7. The high-pressure oil pipe water hammer eliminator according to claim 1, characterized in that: The pressure relief inner tube is an elongated round tube structure, the lower end of the pressure relief inner tube is provided with a pressure relief inner tube external thread 1 connected to the central tube, the lower part of the pressure relief inner tube is provided with a pressure relief inner tube shoulder, and the two side surfaces of the pressure relief inner tube shoulder are respectively matched with the connecting outer tube and the pressure relief lower outer tube, the upper end of the pressure relief inner tube shoulder is provided with a pressure relief inner tube external thread 2 connected to the pressure relief lower outer tube, the middle part of the pressure relief inner tube shoulder is provided with two groups of pressure relief inner tube pressure transmission holes, and the upper part of the pressure relief inner tube shoulder is provided with a pressure relief inner tube external thread 3 connected to the upper joint; The pressure relief lower outer cylinder is a round tube structure, and the inner wall of the lower end of the pressure relief lower outer cylinder is provided with an inner thread of the pressure relief lower outer cylinder connected with the pressure relief inner tube.

8. The high-pressure oil pipe water hammer eliminator according to claim 1, characterized in that: The pressure relief value adjustment ring is an annular structure, and six pressure relief value adjustment ring clamping surfaces are provided in the circumferential direction of the pressure relief value adjustment ring. The inner wall of the pressure relief value adjustment ring is provided with a pressure relief value adjustment ring internal thread connected to the pressure relief upper outer cylinder, and the upper end of the pressure relief value adjustment ring is provided with a pressure relief value adjustment ring groove and adapted to the pressure relief spring pressure ring; The pressure relief spring compression ring is an annular structure, which is composed of the left side of the pressure relief spring compression ring and the right side of the pressure relief spring compression ring connected by the stud, and the left side of the pressure relief spring compression ring and the right side of the pressure relief spring compression ring are both provided with pressure relief spring compression ring mounting holes, and the pressure relief spring compression ring is provided with six pressure relief spring compression ring bosses along the circumference, and the inner wall of the pressure relief spring compression ring is provided with a pressure relief spring compression ring groove and is adapted to the pressure relief value adjustment ring.

9. The high-pressure oil pipe water hammer eliminator according to claim 1, characterized in that: The safety valve core is a circular tube structure, and the inner and outer walls of the upper and lower ends of the safety valve core are provided with safety valve core grooves that are compatible with the V-shaped packing bidirectional seal.

10. The high-pressure oil pipe water hammer eliminator according to claim 1, characterized in that: The pressure relief upper outer cylinder is a round tube structure, the lower end of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder external thread, the lower end outer wall of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder slide groove for matching with the pressure relief spring compression ring boss of the pressure relief spring compression ring, the upper inner wall circumference of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder boss, the two sides of the pressure relief upper outer cylinder boss are respectively adapted to the safety valve core and the upper joint, the upper circumferential outer wall of the pressure relief upper outer cylinder is provided with six pressure relief upper outer cylinder clamping surfaces, and the upper end inner wall of the pressure relief upper outer cylinder is provided with a pressure relief upper outer cylinder internal thread connected to the upper joint; The upper joint is a long round tube structure, the inner wall of the lower end of the upper joint is provided with an upper joint internal thread connected to the pressure relief inner tube, the outer wall of the lower end of the upper joint is provided with an upper joint external thread connected to the pressure relief upper outer tube, and the upper end of the upper joint is provided with an upper joint tapered thread.

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