Hydrodynamic oscillator

Abstract

This invention discloses a hydraulic oscillator, belonging to the technical field of drilling and completion equipment, comprising a drive assembly and a vibration assembly. The drive assembly includes a rotor and a stator, with an internal accommodating space formed within the stator, and the rotor disposed within this space. The vibration assembly includes a vibrating outer cylinder, a vibrating sub, a rotating shaft, and a lower connector. The vibrating outer cylinder is coaxially connected to the stator and communicates with the accommodating space. The rotating shaft is disposed inside the vibrating outer cylinder and coaxially connected to the rotor. A helical block is disposed on the outer circumference of the rotating shaft, inclined along the axial direction of the rotating shaft. The vibrating sub is sleeved on the rotating shaft, and a limiting groove extending circumferentially is formed on the inner wall of the vibrating sub. The helical block passes through the limiting groove and is slidably connected to it. The lower connector is connected to the end of the vibrating outer cylinder furthest from the drive assembly. Through the coordinated operation of the drive assembly and the vibration assembly, high-pressure throttling and other operations are eliminated, effectively reducing pressure loss and improving friction reduction and drag reduction effects.

Description

Technical Field

[0001] This invention relates to the field of drilling and completion equipment technology, and more particularly to a hydraulic oscillator. Background Technology

[0002] As oilfield exploration and development continue to deepen, drilling is gradually moving from shallow wells and easily developed wells to deep wells and wells with complex structures. The number of extended reach wells, horizontal wells, and highly deviated wells is gradually increasing. The geological conditions of the drilled formations are becoming more and more complex, and there are more and more unstable factors downhole. In particular, there are technical problems such as high directional friction, easy pressure build-up, and incomplete cleaning of cuttings beds in the drilling operations of extended reach wells and horizontal wells, which restrict the speed and efficiency of drilling.

[0003] Currently, the main technical solution to the problem of slow directional drilling speed caused by pressure buildup is hydraulic oscillator technology. The hydraulic oscillator converts hydraulic energy into high-frequency vibrations in key components through hydraulic action, generating vibrations along the axis of the drill string assembly or drill pipe. This vibration effectively changes the friction pattern between the drill string and the wellbore, thereby reducing frictional resistance and alleviating the pressure buildup problem.

[0004] Existing hydraulic oscillators primarily use a screw rotor to drive the rotating valve, achieving periodic switching between the moving and stationary valves. This results in periodic pressure changes in the upper flow channel of the tool, which in turn drives the vibration unit to vibrate at high frequency. However, the high-speed rotation of the moving and stationary valves during operation easily leads to severe wear and failure of the valve bodies, and in some cases, valve body detachment can cause pump blockage. Furthermore, the throttling effect of the disc valve results in significant pressure loss during tool use, which increases with drilling fluid density, eventually failing to meet on-site operational requirements. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic oscillator to solve the technical problems of high pressure loss and easy wear of valve body in existing hydraulic oscillators.

[0006] Based on the above concept, the technical solution adopted by this invention is as follows:

[0007] A hydraulic oscillator, comprising:

[0008] A drive assembly includes a rotor and a stator, wherein an accommodating space is formed inside the stator, and the rotor is disposed within the accommodating space;

[0009] The vibration assembly includes a vibration outer cylinder, a vibration short section, a rotating shaft, and a lower connector. The vibration outer cylinder is coaxially connected to the stator and communicates with the accommodating space. The rotating shaft is disposed inside the vibration outer cylinder and coaxially connected to the rotor. A helical block is disposed on the outer periphery of the rotating shaft and is inclined along the axial direction of the rotating shaft. The vibration short section is sleeved on the rotating shaft. A limiting groove extending circumferentially is formed on the inner wall of the vibration short section. The helical block passes through the limiting groove and is slidably connected to the limiting groove. The lower connector is connected to the end of the vibration outer cylinder away from the drive assembly.

[0010] Preferably, two spiral blocks are provided, and the two spiral blocks are arranged at an axial interval along the rotation axis, and the two spiral blocks are tilted in opposite directions.

[0011] Preferably, the inner wall of the vibration short section is provided with at least two sets of limiting blocks, each set having two limiting blocks arranged opposite to each other to form the limiting groove.

[0012] Preferably, the hydraulic oscillator further includes a transmission assembly disposed between the drive assembly and the vibration assembly. The transmission assembly includes a connecting outer cylinder and a transmission rod. The connecting outer cylinder communicates with the accommodating space and the vibration outer cylinder. The transmission rod is disposed inside the connecting outer cylinder. One end of the transmission rod is coaxially connected to the rotor, and the other end of the transmission rod is coaxially connected to the rotating shaft.

[0013] Preferably, the transmission assembly further includes a flow divider seat disposed between the rotor and the transmission rod, and the flow divider seat has a flow passage hole through which fluid can pass.

[0014] Preferably, three flow holes are provided, and the three flow holes are arranged at intervals along the circumference of the flow divider, with an included angle of 120 degrees between two adjacent flow holes.

[0015] Preferably, the hydraulic oscillator further includes a bearing assembly, which includes a gland, a first thrust bearing, a second thrust bearing, and a radial bearing. The radial bearing is interference-fitted onto the transmission rod. The first thrust bearing and the second thrust bearing are distributed at both ends of the radial bearing. The gland is pressed onto the first thrust bearing and threadedly connected to the connecting outer cylinder.

[0016] Preferably, the vibration assembly further includes a disc spring, which is sleeved on the rotating shaft. A limiting protrusion protrudes outward along the radial direction of the rotating shaft. One end of the disc spring is connected to the limiting protrusion, and the other end of the disc spring is connected to the lower connector.

[0017] Preferably, the vibrating outer cylinder is provided with an oil injection hole, which is connected to the inner cavity of the vibrating outer cylinder and the outside.

[0018] Preferably, there are two oil injection holes, which are symmetrically arranged about the vibrating outer cylinder.

[0019] The beneficial effects of this invention are:

[0020] The hydraulic oscillator proposed in this invention, during use, allows high-pressure drilling fluid to flow into the containment space. A portion of the high-pressure drilling fluid drives the rotor to rotate, while another portion flows from the rotor's hollow cavity into the vibrating outer cylinder, directly passing through the entire hydraulic oscillator. The rotor's rotation drives the rotating shaft, and the helical block on the rotating shaft rotates synchronously with it. The rotational motion of the rotating shaft is converted into the axial motion of the vibrating section through the cooperation of the helical block and the limiting groove. Because the helical block is inclined along the axial direction of the rotating shaft (i.e., the helical block and the limiting groove have different points of action in the axial direction), the vibrating section is driven to reciprocate along the axial direction of the rotating shaft. The vibrating section drives the lower connector to reciprocate, thereby driving the entire hydraulic oscillator to reciprocate, thus achieving friction reduction and resistance reduction. The hydraulic oscillator proposed in this invention utilizes the energy of high-pressure drilling fluid to drive the rotor to rotate, eliminating the need for high-pressure throttling and other operations, effectively reducing pressure loss and improving energy utilization. The rotor drives the rotating shaft to rotate, and the interaction between the inclined helical block on the rotating shaft and the limiting groove on the inner wall of the vibrating sub converts the rotational motion into the axial reciprocating motion of the vibrating sub. This transforms the power of the high-pressure drilling fluid into the required vibration, enhancing the effect on altering the frictional resistance between the drill string and the wellbore, improving friction reduction and drag control, and thus increasing drilling speed and efficiency. Furthermore, the absence of valve bodies and other components avoids valve wear and reduces operating costs. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the hydraulic oscillator provided in an embodiment of the present invention;

[0022] Figure 2 yes Figure 1 Enlarged view of point A in the middle;

[0023] Figure 3 This is a partial structural schematic diagram of the hydraulic oscillator provided in an embodiment of the present invention;

[0024] Figure 4 This is a partial structural schematic diagram of the vibration assembly provided in an embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional view of the vibration sub-section provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the diverter provided in an embodiment of the present invention.

[0027] In the picture:

[0028] 1. Drive assembly; 11. Rotor; 12. Stator; 121. Accommodation space;

[0029] 2. Vibration assembly; 21. Vibration outer cylinder; 211. Oil injection hole; 22. Vibration short section; 23. Rotating shaft; 24. Lower connector; 25. Spiral block; 251. Guide groove; 26. Limiting block; 261. Limiting groove; 27. Disc spring; 28. Limiting protrusion;

[0030] 3. Transmission assembly; 31. Connecting outer cylinder; 32. Transmission rod; 33. Flow divider; 331. Flow hole;

[0031] 4. Bearing assembly; 41. Pressure cap; 42. First thrust bearing; 43. Second thrust bearing; 44. Radial bearing. Detailed Implementation

[0032] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0033] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] See Figures 1 to 6 The hydraulic oscillator provided in this embodiment of the invention includes a drive assembly 1 and a vibration assembly 2. The drive assembly 1 includes a rotor 11 and a stator 12. A receiving space 121 is formed inside the stator 12, and the rotor 11 is disposed within the receiving space 121. The vibration assembly 2 includes a vibrating outer cylinder 21, a vibrating sub-section 22, a rotating shaft 23, and a lower connector 24. The vibrating outer cylinder 21 is coaxially connected to the stator 12 and communicates with the receiving space 121. The rotating shaft 23 is disposed inside the vibrating outer cylinder 21 and coaxially connected to the rotor 11. A helical block 25 is disposed on the outer periphery of the rotating shaft 23, and the helical block 25 is inclined along the axial direction of the rotating shaft 23. The vibrating sub-section 22 is sleeved on the rotating shaft 23. A limiting groove 261 extending circumferentially is formed on the inner wall of the vibrating sub-section 22, and the helical block 25 passes through the limiting groove 261 and is slidably connected to the limiting groove 261. The lower connector 24 is connected to the end of the vibrating outer cylinder 21 away from the drive assembly 1.

[0037] As defined herein, the hydraulic oscillator is placed in a vertical direction. For the sake of convenience in describing the following text in conjunction with the accompanying drawings, the direction will be described in the following text with reference to the direction shown in the accompanying drawings, but it is not limited thereto.

[0038] The hydraulic oscillator proposed in this invention, during use, allows high-pressure drilling fluid to flow into the accommodating space 121. A portion of the high-pressure drilling fluid drives the rotor 11 to rotate, while another portion flows from the hollow cavity of the rotor 11 into the vibrating outer cylinder 21, directly flowing through the entire hydraulic oscillator. The rotation of the rotor 11 drives the rotating shaft 23 to rotate, and the helical block 25 on the rotating shaft 23 also rotates synchronously with the rotating shaft 23. Through the cooperation of the helical block 25 and the limiting groove 261, the rotational motion of the rotating shaft 23 is converted into the axial motion of the vibrating section 22. Because the helical block 25 is inclined along the axial direction of the rotating shaft 23, that is, the points of action of the helical block 25 and the limiting groove 261 are different in the axial direction, the vibrating section 22 is driven to reciprocate along the axial direction of the rotating shaft 23. The vibrating section 22 drives the lower connector 24 to reciprocate, thereby driving the entire hydraulic oscillator to reciprocate, thus achieving the effect of reducing friction and resistance. The hydraulic oscillator proposed in this invention utilizes the energy of high-pressure drilling fluid to drive the rotor 11 to rotate, eliminating the need for high-pressure throttling operations, effectively reducing pressure loss and improving energy utilization. The rotor 11 drives the rotating shaft 23 to rotate, and the engagement of the inclined helical block 25 on the rotating shaft 23 with the limiting groove 261 on the inner wall of the vibrating sub 22 converts the rotational motion of the rotating shaft 23 into the axial reciprocating motion of the vibrating sub 22. This transforms the power of the high-pressure drilling fluid into the required vibration, enhancing the effect on altering the frictional resistance between the drill string and the wellbore, improving friction reduction and drag control, and thus increasing drilling speed and efficiency. Furthermore, the absence of valve bodies and other components avoids valve wear and reduces operating costs.

[0039] The specific structure of the hydraulic oscillator is described below.

[0040] The drive assembly 1 uses an existing drive motor, and a hollow accommodating space 121 is formed in the middle of the stator 12, which can increase the area of ​​high-pressure drilling fluid flow and reduce flow resistance.

[0041] See Figure 4 The high-pressure drilling fluid impacts the rotor 11, driving the rotating shaft 23 to rotate. The rotating shaft 23, through the cooperation of the helical blocks 25 and the limiting groove 261, drives the vibrating sub-section 22 to move axially. Specifically, two helical blocks 25 are provided, spaced apart along the axial direction of the rotating shaft 23, with opposite inclination directions. The arrangement of two helical blocks 25 spaced apart along the axial direction of the rotating shaft 23 and with opposite inclination directions allows the vibrating sub-section 22 to receive a more balanced and stable force in the axial direction. The opposite inclination directions of the two helical blocks 25 complement and balance each other, making the axial reciprocating motion of the vibrating sub-section 22 smoother and more continuous, reducing stuttering and fluctuations during movement, further improving the efficiency and stability of vibration transmission, ensuring smooth drilling operations, and also reducing the impact and wear on components caused by unstable vibration, extending the service life of the hydraulic oscillator.

[0042] To facilitate the cooperation between the spiral block 25 and the limiting block 26, a guide groove 251 is provided on the spiral block 25. The guide groove 251 extends circumferentially along the spiral block 25. Part of the limiting block 26 can be limited in the guide groove 251 and slide relative to it along the extension direction of the guide groove 251. The guide groove 251 can provide a clear guiding path for the relative movement of the spiral block 25 and the limiting block 26, ensuring that the spiral block 25 can interact with the limiting block 26 accurately and smoothly during rotation.

[0043] See Figure 5 The inner wall of the vibrating sub-section 22 is provided with at least two sets of limiting blocks 26, each set having two limiting blocks 26 arranged opposite each other to form a limiting groove 261, which can provide more contact and guiding points for the helical block 25, and can enhance the fit stability between the helical block 25 and the limiting groove 261; in addition, the multiple sets of limiting grooves 261 can also disperse the force of the helical block 25 on the vibrating sub-section 22, reduce local stress concentration, and reduce wear and deformation of components.

[0044] To improve the transmission efficiency of the hydraulic oscillator, a transmission assembly 3 is also provided between the drive assembly 1 and the vibration assembly 2 to achieve power transmission. Specifically, the transmission assembly 3 is located between the drive assembly 1 and the vibration assembly 2. The transmission assembly 3 includes a connecting outer cylinder 31 and a transmission rod 32. The connecting outer cylinder 31 connects the accommodating space 121 and the vibrating outer cylinder 21. The transmission rod 32 is located inside the connecting outer cylinder 31. One end of the transmission rod 32 is coaxially connected to the rotor 11, and the other end is coaxially connected to the rotating shaft 23. The connecting outer cylinder 31 connects the accommodating space 121 and the vibrating outer cylinder 21, providing a stable installation and working environment for the transmission rod 32, while also facilitating the flow of high-pressure drilling fluid through the connecting outer cylinder 31 into the vibrating outer cylinder 21. The transmission rod 32 is coaxially connected to both the rotor 11 and the rotating shaft 23, achieving smooth power transmission, reducing energy loss and fluctuations during power transmission, and improving the overall working efficiency of the hydraulic oscillator.

[0045] See Figure 6 The transmission assembly 3 also includes a flow divider 33, which is located between the rotor 11 and the transmission rod 32. The flow divider 33 has a flow passage 331 through which fluid can pass. The flow divider 33 can rationally divide and regulate the high-pressure drilling fluid flowing from the drive assembly 1 to the transmission assembly 3, making the flow of the high-pressure drilling fluid more uniform and stable, reducing turbulence and impact. Furthermore, the presence of the flow passage 331 can control the flow rate and velocity of the high-pressure drilling fluid, allowing it to pass through the transmission assembly 3 in a more suitable state, helping to reduce energy loss, improve energy utilization efficiency, and further reduce the pressure loss of the hydraulic oscillator.

[0046] More specifically, three flow holes 331 are provided, arranged circumferentially around the flow divider 33, with an included angle of 120 degrees between adjacent flow holes 331. This uniformly distributed design of the three flow holes 331 enables more uniform fluid distribution. This allows the high-pressure drilling fluid to flow in a more balanced and stable manner as it passes through the flow divider 33, avoiding excessively high or low pressure in certain areas, thereby further improving the stability and reliability of the entire hydraulic oscillator. The 120-degree angular spacing helps to create a balanced fluid distribution circumferentially, reducing vortices and turbulence in the high-pressure drilling fluid flow and minimizing energy loss.

[0047] In other embodiments, two or four flow holes 331 may also be provided. The number and location of the flow holes 331 are not limited here.

[0048] In addition, the vibration assembly 2 also includes a disc spring 27, which is sleeved on the rotating shaft 23. A limiting protrusion 28 protrudes radially outward from the rotating shaft 23. One end of the disc spring 27 is connected to the limiting protrusion 28, and the other end is connected to the lower connector 24. The disc spring 27 provides a certain degree of elastic cushioning. When the rotating shaft 23 drives the vibration sub-section 22 to perform axial reciprocating motion, the disc spring 27 can absorb and mitigate the impact and vibration during the motion, reducing the instantaneous impact force between components. Furthermore, the disc spring 27 helps maintain the stability and consistency of the vibration, balancing and adjusting the force between the rotating shaft 23 and the lower connector 24, making the movement of the vibration sub-section 22 smoother.

[0049] During the use of a hydraulic vibrator, lubricating oil needs to be added periodically to extend its service life. Therefore, an oil injection hole 211 is provided on the outer vibrating cylinder 21, connecting the inner cavity of the outer vibrating cylinder 21 to the outside. The oil injection hole 211 facilitates lubrication and maintenance of the inner cavity of the outer vibrating cylinder 21. Lubricating oil or grease can be injected into the inner cavity of the outer vibrating cylinder 21 through the oil injection hole 211, effectively reducing friction and wear between internal components and lowering the rate of component wear.

[0050] Specifically, there are two oil injection holes 211, symmetrically arranged about the vibrating outer cylinder 21. This symmetrical arrangement allows for faster and more even injection of lubricating oil into the inner cavity of the vibrating outer cylinder 21. Compared to a single oil injection hole 211, the dual holes shorten the injection time, improve efficiency, and ensure sufficient and timely lubrication of all parts of the inner cavity. The symmetrical distribution also helps to ensure a more uniform distribution of lubricating oil within the vibrating outer cylinder 21, preventing localized insufficient lubrication.

[0051] See Figure 2To ensure that the transmission rod 32 does not move axially or radially, the hydraulic oscillator also includes a bearing assembly 4. The bearing assembly 4 includes a cover 41, a first thrust bearing 42, a second thrust bearing 43, and a radial bearing 44. The radial bearing 44 is interference-fitted onto the transmission rod 32. The first thrust bearing 42 and the second thrust bearing 43 are located at both ends of the radial bearing 44. The cover 41 is pressed onto the first thrust bearing 42 and threadedly connected to the connecting outer cylinder 31. The interference fit of the radial bearing 44 onto the transmission rod 32 provides stable radial support, ensuring that the transmission rod 32 maintains precise position and stable movement during rotation and transmission, reducing radial runout and deviation. The first thrust bearing 42 and the second thrust bearing 43, located at both ends of the radial bearing 44, effectively bear axial loads, preventing axial movement of the transmission rod 32. The cover 41, pressed onto the first thrust bearing 42 and threadedly connected to the connecting outer cylinder 31, makes the entire bearing assembly 4 more robust and compact. The gland 41 provides additional clamping force to ensure the normal operation of the thrust bearing and radial bearing 44, while the threaded connection facilitates installation and disassembly, making it convenient for later maintenance and repair.

[0052] In addition, to improve the sealing performance of the hydraulic oscillator, sealing rings are provided on the drive assembly 1, vibration assembly 2, transmission assembly 3 and bearing assembly 4. Common O-rings, V-rings, etc. can be selected for the sealing rings, which will not be elaborated here.

[0053] There are no restrictions on the number and location of the sealing rings; you can choose according to your actual needs.

[0054] The above embodiments merely illustrate the basic principles and characteristics of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydrodynamic oscillator, characterized in that include: The drive assembly (1) includes a rotor (11) and a stator (12), wherein an accommodating space (121) is formed inside the stator (12), and the rotor (11) is disposed within the accommodating space (121); The vibration assembly (2) includes a vibration outer cylinder (21), a vibration short section (22), a rotating shaft (23), and a lower connector (24). The vibration outer cylinder (21) is coaxially connected to the stator (12) and communicates with the accommodating space (121). The rotating shaft (23) is disposed inside the vibration outer cylinder (21) and coaxially connected to the rotor (11). A helical block (25) is disposed on the outer periphery of the rotating shaft (23). The vibrating short section (22) is inclined along the axial direction of the rotating shaft (23), and is sleeved on the rotating shaft (23). The inner wall of the vibrating short section (22) has a limiting groove (261) extending circumferentially. The spiral block (25) passes through the limiting groove (261) and is slidably connected to the limiting groove (261). The lower connector (24) is connected to one end of the vibrating outer cylinder (21) away from the drive assembly (1).

2. The hydraulic oscillator of claim 1, wherein, Two spiral blocks (25) are provided, and the two spiral blocks (25) are arranged at an axial interval along the rotation axis (23), and the two spiral blocks (25) are tilted in opposite directions.

3. The hydraulic oscillator according to claim 2, characterized in that, The inner wall of the vibration short section (22) is provided with at least two sets of limiting blocks (26), each set having two limiting blocks (26) arranged opposite to each other to form the limiting groove (261).

4. The hydraulic oscillator according to claim 1, characterized in that, The hydraulic oscillator also includes a transmission assembly (3), which is disposed between the drive assembly (1) and the vibration assembly (2). The transmission assembly (3) includes a connecting outer cylinder (31) and a transmission rod (32). The connecting outer cylinder (31) connects the accommodating space (121) and the vibration outer cylinder (21). The transmission rod (32) is disposed inside the connecting outer cylinder (31). One end of the transmission rod (32) is coaxially connected to the rotor (11), and the other end of the transmission rod (32) is coaxially connected to the rotating shaft (23).

5. The hydraulic oscillator according to claim 4, characterized in that, The transmission assembly (3) also includes a flow divider (33), which is disposed between the rotor (11) and the transmission rod (32). The flow divider (33) has a flow hole (331) on it, through which fluid can pass.

6. The hydraulic oscillator according to claim 5, characterized in that, The flow passage (331) is provided in three parts, and the three flow passages (331) are arranged at intervals along the circumference of the flow divider (33), with the included angle between two adjacent flow passages (331) being 120 degrees.

7. The hydraulic oscillator according to claim 1, characterized in that, The hydraulic oscillator also includes a bearing assembly (4), which includes a cover (41), a first thrust bearing (42), a second thrust bearing (43), and a radial bearing (44). The radial bearing (44) is interference-fitted onto the transmission rod (32). The first thrust bearing (42) and the second thrust bearing (43) are distributed at both ends of the radial bearing (44). The cover (41) is pressed onto the first thrust bearing (42) and threadedly connected to the connecting outer cylinder (31).

8. The hydraulic oscillator according to claim 1, characterized in that, The vibration assembly (2) also includes a disc spring (27), which is sleeved on the rotating shaft (23). A limiting protrusion (28) protrudes outward along its own radial direction on the rotating shaft (23). One end of the disc spring (27) is connected to the limiting protrusion (28), and the other end of the disc spring (27) is connected to the lower connector (24).

9. The hydraulic oscillator according to claim 1, characterized in that, The vibrating outer cylinder (21) is provided with an oil injection hole (211), which is connected to the inner cavity of the vibrating outer cylinder (21) and the outside.

10. The hydraulic oscillator according to claim 9, characterized in that, There are two oil injection holes (211), and the two oil injection holes (211) are symmetrically arranged about the vibrating outer cylinder (21).

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