A magnetic hydraulic oscillator

Abstract

This invention relates to the field of downhole tool technology, and more particularly to a magnetic hydraulic oscillator, aiming to solve the technical problem of poor adaptability of existing hydraulic oscillators. The magnetic hydraulic oscillator includes a power sub, which comprises a power casing, a screw rotor, and an adjustment mechanism. The screw rotor is disposed within the power casing and rotatably engages with it. The adjustment mechanism, also disposed within the power casing, includes a stationary valve disc, a pendulum, and a fixed cover. The pendulum is positioned between the stationary valve disc and the fixed cover, and a transmission assembly is provided between it and the screw rotor. The transmission assembly can drive the pendulum to swing when the screw rotor is rotating, and the swing amplitude is proportional to the rotational speed of the screw rotor. This magnetic hydraulic oscillator can adaptively change its flow area according to different oscillation conditions, thereby adapting to different formations and improving drilling efficiency.

Description

Technical Field

[0001] This invention relates to the field of downhole tool technology, and more particularly to a magnetic hydraulic oscillator. Background Technology

[0002] With the continuous progress and development of oil and gas drilling, the challenging drilling environment is also gradually increasing. Wellbores are becoming more and more irregular and the inclination angle is large. These factors will lead to greater friction between the drill string and the well wall in sliding drilling mode, which will seriously affect drilling efficiency. At this time, hydraulic oscillators are needed to generate axial vibration to solve the pressure problem and improve the mechanical drilling speed.

[0003] Existing hydraulic oscillators generally consist of a power sub, a valve shaft assembly, and an oscillating sub. The screw motor in the power sub drives the valve plate of the valve shaft assembly to rotate continuously, achieving periodic changes in the flow area to alter the pressure. This causes pressure fluctuations in the tool's flow channel, which in turn drives the oscillating sub to generate reciprocating thrust on the drill string. Therefore, it can be seen that the flow area of ​​existing hydraulic oscillators cannot adaptively adjust according to actual drilling conditions, thus failing to adapt to the increasingly common oilfield drilling methods. Summary of the Invention

[0004] The purpose of this invention is to provide a magnetically attracted hydraulic oscillator to solve the technical problem of poor adaptability of existing hydraulic oscillators.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] The magnetic hydraulic oscillator provided by the present invention includes: a power section, wherein the power section includes a power sleeve, a screw rotor, and an adjustment mechanism;

[0007] The screw rotor is disposed inside the power sleeve and rotates in conjunction with the power sleeve;

[0008] The adjustment mechanism is located inside the power sleeve and includes a static valve disc, a pendulum, and a fixed cover;

[0009] The static valve disc has a concave spherical surface. Around the axis of the concave spherical surface, there are multiple spaced flow channels. One end of each flow channel is connected to the center of the concave spherical surface, and the other end extends away from the center of the concave spherical surface. The cross-section of the flow channel gradually increases from the center of the concave spherical surface to the direction away from the center of the concave spherical surface.

[0010] The pendulum is disposed between the static valve disc and the fixed cover. One end of the pendulum is a spherical end adapted to the concave spherical surface and is about the axis of the spherical end. The spherical end is provided with a plurality of first flow holes. The other end is spherically hinged to the fixed cover and a transmission assembly is provided between it and the screw rotor.

[0011] The transmission component can drive the pendulum to swing when the screw rotor is rotating, and the swing amplitude is proportional to the rotational speed of the screw rotor.

[0012] Furthermore, the transmission assembly includes two small magnets and two large magnets;

[0013] Two small magnets are spaced apart on the pendulum, and the magnetic poles of the two small magnets are the same.

[0014] Two large magnet blocks are spaced apart on the screw rotor, and the magnetic poles of the two large magnet blocks are different.

[0015] Furthermore, the screw rotor is provided with a magnetic connector, and two large magnet blocks are disposed on the magnetic connector.

[0016] Furthermore, a sealing ring is embedded outside the static valve disc, and the sealing ring abuts against the inner wall of the power sleeve.

[0017] Furthermore, the fixed cover is provided with a second flow hole that penetrates through it, and the second flow hole extends along the axial direction of the power sleeve.

[0018] Furthermore, the power sub-section also includes a screw stator and an upper valve disc;

[0019] The screw stator is fixed inside the power sleeve and sleeved on the screw rotor;

[0020] The upper valve disc is fixed inside the power sleeve and is located at the end of the screw rotor away from the pendulum, and is connected to the screw stator.

[0021] Furthermore, the power sub-section also includes a rotor auxiliary rod, which is inserted into the screw rotor, and the axes of the two coincide.

[0022] Furthermore, the magnetic hydraulic oscillator also includes an oscillation section.

[0023] The power sub-section also includes a connector, which is located at the end of the screw rotor away from the pendulum and is fixedly connected between the power sleeve and the oscillation sub-section.

[0024] Furthermore, the oscillating section includes a piston, a splined shaft, and a disc spring;

[0025] The piston is fixedly connected to the spline shaft, and both are inserted through the oscillating sleeve, with the piston and the inner wall of the oscillating sleeve in a sealed fit.

[0026] The disc spring is located inside the oscillating sleeve and is sleeved on the spline shaft. In the axial direction of the oscillating sleeve, one end of the disc spring is connected to the oscillating sleeve, and the other end is connected to the spline shaft.

[0027] Furthermore, the oscillation subsection also includes a splined center tube;

[0028] The spline center tube is located inside the oscillating sleeve and is sleeved on the spline shaft, and is keyed to the spline shaft;

[0029] The other end of the disc spring is connected to the spline center tube.

[0030] In summary, the technical effects achieved by the magnetic hydraulic oscillator provided by this invention are as follows:

[0031] In this magnetic hydraulic oscillator, when drilling fluid enters the power casing and flows sequentially through the screw rotor, fixed cover, pendulum, and stationary valve disc, the screw rotor rotates first, and its rotational speed depends on the oscillation frequency of the drilling fluid. As the screw rotor rotates, it drives the pendulum to swing via the transmission assembly. The higher the oscillation frequency, the higher the screw rotor speed, and correspondingly, the greater the swing amplitude of the pendulum's spherical end, resulting in a larger angle with the axis of the stationary valve disc. Furthermore, the larger the inner diameter of the concave spherical surface, the larger the flow area through which the drilling fluid can pass. Conversely, the lower the oscillation frequency, the lower the screw rotor speed, and correspondingly, the smaller the swing amplitude of the pendulum's spherical end, resulting in a smaller angle with the axis of the stationary valve disc. This also reduces the flow area between the pendulum and the stationary valve disc. In this way, the purpose of controlling the flow area of ​​the drilling fluid to regulate the frequency of drilling fluid pressure changes is achieved.

[0032] It can be seen that, compared with existing technologies, this magnetic hydraulic oscillator can adaptively change the flow area according to different oscillation conditions, thereby adapting to different formations and improving drilling efficiency. Attached Figure Description

[0033] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0034] Figure 1 A cross-sectional view of the power sub section provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the adjustment mechanism provided in an embodiment of the present invention;

[0036] Figure 3A cross-sectional view of the adjustment mechanism provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the static valve disc provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the structure of the pendulum provided in an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the structure of the fixing cover provided in an embodiment of the present invention;

[0040] Figure 7 A cross-sectional view of an oscillating section provided in an embodiment of the present invention.

[0041] Icons: 1-Power sleeve; 2-Screw rotor;

[0042] 3-Stationary valve disc; 3.1-Flow passage;

[0043] 4-Pendulum; 4.1-First flow passage;

[0044] 5-Fixed cover; 5.1-Second flow hole;

[0045] 6-Small magnet block; 7-Large magnet block; 8-Magnetic connector; 9-Screw stator; 10-Upper valve disc; 11-Rotor auxiliary rod; 12-Connector; 13-Oscillating sleeve; 14-Piston; 15-Splined shaft; 16-Disc spring; 17-Splined center tube; 18-Power upper connector; 19-Oscillating upper connector; 20-Piston positioning block; 21-Piston rod. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0048] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0049] Existing hydraulic oscillators generally consist of a power sub, a valve shaft assembly, and an oscillating sub. The screw motor in the power sub drives the valve plate of the valve shaft assembly to rotate continuously, achieving periodic changes in the flow area to alter the pressure. This causes pressure fluctuations in the tool's flow channel, which in turn drives the oscillating sub to generate reciprocating thrust on the drill string. Therefore, it can be seen that the flow area of ​​existing hydraulic oscillators cannot adaptively adjust according to actual drilling conditions, thus failing to adapt to the increasingly common oilfield drilling methods.

[0050] In view of this, the present invention provides a magnetically aspirated hydraulic oscillator, including a power section, which includes a power sleeve 1, a screw rotor 2, and an adjustment mechanism; the screw rotor 2 is disposed inside the power sleeve 1 and rotates in cooperation with the power sleeve 1; the adjustment mechanism is disposed inside the power sleeve 1 and includes a stationary valve disc 3, a pendulum 4, and a fixing cover 5; the stationary valve disc 3 has a concave spherical surface, and around the axis of the concave spherical surface, there are multiple spaced flow channels 3.1, one end of each flow channel 3.1 is connected to each other at the center of the concave spherical surface, and the other end extends away from the concave spherical surface. Extending from the center of the spherical surface, the cross-section of the flow channel 3.1 gradually increases from the center of the concave spherical surface to the direction away from the center of the concave spherical surface; the pendulum 4 is disposed between the stationary valve disc 3 and the fixed cover 5, one end of which is a spherical end adapted to the concave spherical surface, and around the axis of the spherical end, the spherical end is provided with a plurality of first flow holes 4.1, the other end is spherically hinged to the fixed cover 5, and a transmission assembly is provided between it and the screw rotor 2; the transmission assembly can drive the pendulum 4 to swing when the screw rotor 2 is rotating, and the swing amplitude is proportional to the rotational speed of the screw rotor 2.

[0051] In this magnetic hydraulic oscillator, when drilling fluid enters the power casing 1 and flows sequentially through the screw rotor 2, fixed cover 5, pendulum 4, and stationary valve disc 3, the screw rotor 2 rotates first, and the rotational speed of the screw rotor 2 depends on the oscillation frequency of the drilling fluid. When the screw rotor 2 rotates, it drives the pendulum 4 to swing through the transmission assembly. When the oscillation frequency is higher, the rotational speed of the screw rotor 2 is higher, and correspondingly, the swing amplitude of the spherical end of the pendulum 4 is larger, thus the angle between it and the axis of the stationary valve disc 3 is larger. At the point where the inner diameter of the concave spherical surface is larger, the flow area that the drilling fluid can pass through is larger. When the oscillation frequency is lower, the rotational speed of the screw rotor 2 is smaller, and correspondingly, the swing amplitude of the spherical end of the pendulum 4 is smaller, thus the angle between it and the axis of the stationary valve disc 3 is smaller, and the flow area between the pendulum 4 and the stationary valve disc 3 is also smaller. In this way, the purpose of controlling the flow area of ​​the drilling fluid to adjust the frequency of drilling fluid pressure changes is achieved.

[0052] It can be seen that, compared with existing technologies, this magnetic hydraulic oscillator can adaptively change the flow area according to different oscillation conditions, thereby adapting to different formations and improving drilling efficiency.

[0053] The following combination Figures 1 to 7The structure and shape of the magnetic hydraulic oscillator provided in this embodiment will be described in detail:

[0054] Regarding the power short section, specifically:

[0055] refer to Figures 1 to 6 The power sub-section consists of a power upper connector 18, a power sleeve 1, an adjustment mechanism, a screw rotor 2, a screw stator 9, a rotor auxiliary rod 11, an upper valve disc 10, and a connector 12.

[0056] As described above, one end of the power connector 18 is connected to the power sleeve 1 by a thread, so that when the drill pipe drives the power connector 18 to rotate, torque can be transmitted downwards; the other end of the power sleeve 1 is connected to the connector 12 by a thread, and the connector 12 is connected to the oscillating sub by a thread, thereby achieving the effect of transmitting the torque generated by the drill pipe downwards.

[0057] Continuing from the above, an adjustment mechanism is located inside one end of the power sleeve 1. The adjustment mechanism consists of a stationary valve disc 3, a pendulum 4, a fixed cover 5, small magnets 6, large magnets 7, and a magnet connector 8. The outer side of the stationary valve disc 3 is provided with a sealing hole, which contacts the power sleeve 1 through a sealing ring to achieve a good sealing effect. One side of the stationary valve disc 3 is a concave spherical surface, and there are many trapezoidal holes (i.e., flow channels 3.1) around the center of the disc, with the base of the trapezoids becoming larger as they move away from the center. The pendulum 4 is in contact with the spherical end of the stationary valve disc 3. One end of the pendulum 4 is a spherical end with multiple first flow channels 4.1. The other end of the pendulum 4 is spherically hinged to the fixed cover 5 and is provided with two small magnets 6. The fixed cover 5, which is connected to the pendulum 4 by a hinge, is provided with multiple second flow channels 5.1, mainly to ensure that the pendulum 4 can swing without affecting the change of the flow velocity.

[0058] Continuing from the above, the power casing 1 also contains a screw rotor 2, on which a magnetic connector 8 is mounted. The magnetic connector 8 and the screw rotor 2 are interference-fitted, allowing the screw rotor 2 to rotate and drive the magnetic connector 8 to rotate as well. Two large magnets 7 with different magnetic poles are mounted on the magnetic connector 8 to attract a small magnet 6, causing the pendulum 4 to swing around its hinge end. As the drilling fluid oscillation frequency gradually increases, the screw rotor 2 rotates faster, and the large magnets 7 on the screw rotor 2 also rotate faster synchronously. At this time, the small magnet 6, due to the attraction of the large magnets 7, drives the pendulum 4 to swing. Due to the high rotation speed, the resulting attraction causes the pendulum 4 to swing with a larger amplitude, increasing the angle between the axis of the pendulum 4 and the static valve disc 3. Since the inner diameter of the static valve disc 3 is larger, the drilling fluid can pass through a larger area, thus achieving a regulating effect.

[0059] Continuing from the above, it should be added that the screw rotor 2 has a rotor auxiliary rod 11 inside, which is used to assist the screw rotor 2 in rotating to ensure that the screw rotor 2 does not deviate; the lower end of the screw rotor 2 is an upper valve disc 10, which is provided with many arc-shaped slots, through which drilling fluid mainly flows in evenly; the outside of the screw rotor 2 is a screw stator 9, which is fixed by the stepped section of the power sleeve 1, so that the screw rotor 2 can rotate within the screw stator 9 while rotating on its own axis.

[0060] Regarding the oscillation sub-segment, specifically:

[0061] refer to Figure 7 The oscillation short section consists of an oscillation upper connector 19, a piston positioning block 20, a piston rod 21, an oscillation sleeve 13, a piston 14, a spline shaft 15, a disc spring 16, and a spline center tube 17.

[0062] As described above, one end of the oscillating upper connector 19 is threadedly connected to the connector 12, enabling the torque generated by the drill pipe to be transmitted to the connector 12 via the power upper connector 18, which then drives the transmission of the oscillating sub. The other end is threadedly connected to the oscillating sleeve 13. A piston positioning block 20 is provided inside the oscillating sleeve 13. One end of the piston positioning block 20 contacts the oscillating upper connector 19, and the other end contacts the piston 14. A piston rod 21 is provided inside the piston 14, and the other end of the piston rod 21 is threadedly connected to the splined shaft 15. A disc spring is provided between the splined shaft 15 and the oscillating sleeve 13. 16. The lower end of the disc spring 16 contacts the spline center tube 17. At the same time, the inside of the spline center tube 17 contacts the spline shaft 15. When the spline center tube 17 is rotated, the spline shaft 15 will be rotated due to the spline teeth inside the spline center tube 17, thus realizing the function of transmitting torque, and enabling the spline shaft 15 to continue to transmit torque. One end of the piston rod 21 is provided with a mounting shoulder. The upper end of the piston rod 21 is threaded with a piston positioning block 20. The piston 14 is fixedly connected to the piston rod 21 through the piston positioning block 20 and the mounting shoulder.

[0063] Continuing from the above, the piston 14 is designed to be propelled by the impact of the drilling fluid. The pressure of the drilling fluid creates a thrust on the piston 14, which in turn drives the spline shaft 15 via the piston rod 21. Due to the design of the flow passage in the upper valve disc 10 and the adjustment mechanism, the drilling fluid pressure can vary according to the oscillation frequency. Therefore, the thrust of the piston 14 on the spline shaft 15 also changes. The frequency of the change in the thrust of the piston 14 on the spline shaft 15 is the same as the frequency of the change in the drilling fluid pressure, which allows the change in the thrust of the piston 14 on the spline shaft 15 to be controlled by the adjustment mechanism. When the drilling fluid pressure is greater than the spring force of the disc spring 16, the drilling fluid impacts the piston 14, pushing the spline shaft 15 downward. When the drilling fluid pressure is less than the spring force of the disc spring 16, the piston 14 needs to be reset to its original position. At this time, the disc spring 16 plays an important role in stabilizing the drilling fluid pressure and controlling the movement of the piston 14. The disc spring 16 has good elasticity and can store energy after compression and deformation, and release this energy after the external force disappears. Therefore, the disc spring 16 can push the piston 14 through its elastic force to overcome the reverse action of the drilling hydraulic force, and then make the piston 14 drive the spline shaft 15 to reset through the piston rod 21.

[0064] The working process of the magnetic hydraulic oscillator provided in this embodiment is as follows:

[0065] When the magnetic hydraulic oscillator is working, the drilling fluid passes sequentially through the upper oscillator connector 19, upper valve disc 10, screw stator 9, screw rotor 2, fixed cover 5, pendulum 4, and stationary valve disc 3. When the drilling fluid is between the upper valve disc 10 and the fixed cover 5, it flows between the screw stator 9 and the screw rotor 2, causing the screw rotor 2 to rotate. The screw rotor 2 then drives the magnetic connector 8 to rotate as well. When the oscillation frequency is higher, the large magnet 7 attracts the small magnet 6, causing the pendulum 4 to swing more violently. The flow hole between the pendulum 4 and the stationary valve disc 3... The area will also increase, thereby controlling the flow area of ​​the drilling fluid to adjust the frequency of pressure changes in the drilling fluid. The drilling fluid with changing pressure impacts the piston 14 through the connector 12 and the oscillating upper connector 19. When the pressure of the drilling fluid is greater than the elastic force of the disc spring 16, the drilling fluid pushes the piston 14, which drives the spline shaft 15 to move downward through the piston rod 21. Conversely, when the pressure of the drilling fluid is less than the elastic force of the disc spring 16, the disc spring 16 pushes the piston 14, which drives the spline shaft 15 to return to its original position through the piston rod 21, thereby achieving the oscillation effect.

[0066] This magnetic hydraulic oscillator transports drilling fluid to the power sub-section by allowing the drilling fluid to flow through the upper valve disc 10, causing the screw rotor 2 to rotate, and by using the rotor auxiliary rod 11 to assist in the rotation. At the power sub-section, the drilling fluid flows through the fixed cover 5 and the flow passage 3.1 between the pendulum 4 and the stationary valve disc 3. When oscillating, the relative area of ​​the flow passage 3.1 changes, resulting in a change in the flow area. This change in flow area generates drilling fluid pressure that pushes the piston 14, causing oscillation at the disc spring 16 and the spline shaft 15. This magnetic hydraulic oscillator can adaptively change the flow area according to the current oscillation frequency, thereby increasing the oscillation frequency more quickly, improving drilling efficiency, solving the current problem of low efficiency in oil drilling, improving drilling stability, shortening the construction period, and promoting the development of the drilling industry.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A magnetically attracted hydraulic oscillator, characterized in that, include: The power sub-section includes a power sleeve (1), a screw rotor (2), and an adjustment mechanism; The screw rotor (2) is disposed inside the power sleeve (1) and rotates in cooperation with the power sleeve (1); The adjustment mechanism is located inside the power sleeve (1) and includes a static valve disc (3), a pendulum (4) and a fixed cover (5); The static valve disc (3) is provided with a concave spherical surface. Around the axis of the concave spherical surface, there are multiple spaced flow channels (3.1) on the concave spherical surface. One end of each flow channel (3.1) is connected to the center of the concave spherical surface, and the other end extends away from the center of the concave spherical surface. The cross-section of the flow channel (3.1) gradually increases from the center of the concave spherical surface to the direction away from the center of the concave spherical surface. The pendulum (4) is disposed between the static valve disc (3) and the fixed cover (5). One end of the pendulum is a spherical end adapted to the concave spherical surface and is arranged around the axis of the spherical end. The spherical end is provided with a plurality of first flow holes (4.1). The other end is spherically hinged to the fixed cover (5) and a transmission assembly is provided between it and the screw rotor (2). The transmission component can drive the pendulum (4) to swing when the screw rotor (2) is rotating, and the swing amplitude is proportional to the rotational speed of the screw rotor (2).

2. The magnetic hydraulic oscillator according to claim 1, characterized in that, The transmission assembly includes two small magnets (6) and two large magnets (7); Two small magnet blocks (6) are spaced apart on the pendulum (4), and the magnetic poles of the two small magnet blocks (6) are the same; Two large magnet blocks (7) are spaced apart on the screw rotor (2), and the magnetic poles of the two large magnet blocks (7) are different.

3. The magnetic hydraulic oscillator according to claim 2, characterized in that, The screw rotor (2) is provided with a magnet joint (8), and two large magnet blocks (7) are disposed on the magnet joint (8).

4. The magnetic hydraulic oscillator according to claim 1, characterized in that, The static valve disc (3) is fitted with a sealing ring, which abuts against the inner wall of the power sleeve (1).

5. The magnetically attracted hydraulic oscillator according to claim 1, characterized in that, The fixed cover (5) is provided with a second flow hole (5.1) that penetrates through it, and the second flow hole (5.1) extends along the axial direction of the power sleeve (1).

6. The magnetic hydraulic oscillator according to claim 1, characterized in that, The power sub-section also includes a screw stator (9) and an upper valve disc (10); The screw stator (9) is fixed inside the power sleeve (1) and sleeved on the screw rotor (2); The upper valve disc (10) is fixed inside the power sleeve (1) and located at the end of the screw rotor (2) away from the pendulum (4), and is connected to the screw stator (9).

7. The magnetically attracted hydraulic oscillator according to claim 6, characterized in that, The power section also includes a rotor auxiliary rod (11), which is inserted into the screw rotor (2) and the axes of the two coincide.

8. The magnetically attracted hydraulic oscillator according to any one of claims 1 to 7, characterized in that, The magnetic hydraulic oscillator also includes an oscillation section. The power sub also includes a connector (12), which is located at the end of the screw rotor (2) away from the pendulum (4) and is fixedly connected between the power sleeve (1) and the oscillation sub.

9. The magnetic hydraulic oscillator according to claim 8, characterized in that, The oscillation section includes an oscillation sleeve (13), a piston (14), a splined shaft (15), and a disc spring (16); The piston (14) is fixedly connected to the spline shaft (15), and both are inserted through the oscillating sleeve (13), and the piston (14) is sealed to the inner wall of the oscillating sleeve (13); The disc spring (16) is located inside the oscillating sleeve (13) and sleeved on the spline shaft (15). In the axial direction of the oscillating sleeve (13), one end of the disc spring (16) is connected to the oscillating sleeve (13), and the other end is connected to the spline shaft (15).

10. The magnetically attracted hydraulic oscillator according to claim 9, characterized in that, The oscillating subsection also includes a splined center tube (17); The spline center tube (17) is located inside the oscillating sleeve (13) and is sleeved on the spline shaft (15), and is keyed to the spline shaft (15); The other end of the disc spring (16) is connected to the spline center tube (17).

Images