Magnetic absorption hydraulic oscillator

Abstract

The invention relates to the technical field of downhole tools, in particular to a magnetic attraction hydraulic oscillator, and aims to solve the technical problem that an existing hydraulic oscillator is poor in adaptability. The magnetic suction hydraulic oscillator comprises a power short section, wherein the power short section comprises a power sleeve, a screw rotor and an adjusting mechanism; the screw rotor is arranged in the power sleeve and is in running fit with the power sleeve; the adjusting mechanism is arranged in the power sleeve and comprises a static valve disc, a pendulum bob and a fixed cover; the pendulum bob is arranged between the static valve disc and the fixed cover, and a transmission assembly is arranged between the pendulum bob and the screw rotor; the transmission assembly can drive the pendulum bob to swing under the working condition that the screw rotor rotates, and the swing amplitude is in direct proportion to the rotating speed of the screw rotor. According to different oscillation conditions, the magnetic attraction hydraulic oscillator can change the overflowing area in a self-adaptive mode, so that the magnetic attraction hydraulic oscillator can adapt to different stratums, and the well drilling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of downhole tools, and in particular to a magnetic attraction hydraulic oscillator. Background Art

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

[0003] The existing hydraulic oscillator is generally composed of a power sub, a valve shaft assembly and an oscillation sub. The screw motor in the power sub drives the valve plate of the valve shaft assembly to rotate continuously, realizing the periodic change of the flow area, so as to change the pressure, so that the pressure in the tool flow channel fluctuates, thereby driving the oscillation sub to generate reciprocating thrust on the drill string. It can be seen from this that the flow area of ​​the existing hydraulic oscillator cannot be adaptively adjusted according to the actual drilling situation, and thus cannot adapt to the increasing number of oil field drilling methods. Summary of the invention

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

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

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

[0007] The screw rotor is disposed in the power sleeve and is rotationally matched with the power sleeve;

[0008] The regulating mechanism is arranged in the power sleeve and comprises a static valve disc, a pendulum and a fixed cover;

[0009] The static valve disc is provided with a concave spherical surface, and around the axis of the concave spherical surface, a plurality of flow passages are provided on the concave spherical surface at intervals, one end of each of the flow passages is connected to each other at the center of the concave spherical surface, and the other end extends in a direction away from the center of the concave spherical surface, and the cross section of the flow passage 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 arranged between the static valve disc and the fixed cover, one end of which is a spherical end adapted to the concave spherical surface and surrounds the axis of the spherical end, a plurality of first flow holes are arranged on the spherical end, the other end is spherically hinged with the fixed cover, and a transmission assembly is arranged between the pendulum and the screw rotor;

[0011] The transmission assembly can drive the pendulum to swing when the screw rotor rotates, and the swing amplitude is proportional to the rotation speed of the screw rotor.

[0012] Further, the transmission assembly includes two small magnet blocks and two large magnet blocks;

[0013] Two small magnet blocks are arranged at intervals on the pendulum, and the magnetic poles of the two small magnet blocks are consistent;

[0014] The two large magnet blocks are arranged at intervals on the screw rotor, and the magnetic poles of the two large magnet blocks are different.

[0015] Furthermore, a magnet joint is provided on the screw rotor, and the two large magnet blocks are arranged on the magnet joint.

[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 penetrating the fixed cover, and the second flow hole extends along the axial direction of the power sleeve.

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

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

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

[0021] Furthermore, the power sub also includes a rotor auxiliary rod, and the rotor auxiliary rod is plug-fitted with the screw rotor, and the axes of the two coincide.

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

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

[0024] Further, the oscillation short section includes a piston, a spline shaft and a disc spring;

[0025] The piston is fixedly connected to the spline shaft, and the two are inserted into the oscillation sleeve, and the piston is sealed and matched with the inner wall of the oscillation sleeve;

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

[0027] Further, the oscillation sub also includes a spline center tube;

[0028] The spline center tube is located in the oscillating sleeve, is sleeved on the spline shaft, and is key-connected with the spline shaft;

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

[0030] In summary, the technical effects that can be achieved by the magnetic hydraulic oscillator provided by the present invention are:

[0031] In the magnetic hydraulic oscillator, when the drilling fluid enters the power casing and flows through the screw rotor, the fixed cover, the pendulum and the static valve disc in sequence, the screw rotor rotates first, and the speed of the screw rotor depends on the oscillation frequency of the drilling fluid; when the screw rotor rotates, the pendulum is driven to swing through the transmission component. When the oscillation frequency is higher, the speed of the screw rotor is higher. Correspondingly, the swing amplitude of the spherical end of the pendulum is larger, and thus the angle with the axis of the static valve disc is larger. The larger the inner diameter of the concave spherical surface, the larger the flow area that the drilling fluid can pass through. When the oscillation frequency is smaller, the speed of the screw rotor becomes smaller. Correspondingly, the swing amplitude of the spherical end of the pendulum is reduced, and thus the angle with the axis of the static valve disc is reduced. The flow hole area between the pendulum and the static valve disc will also be reduced. In this way, the purpose of controlling the flow area of ​​the drilling fluid to adjust the frequency of drilling fluid pressure change is achieved.

[0032] It can be seen that compared with the existing technology, the magnetic hydraulic oscillator can adaptively change the flow area according to different oscillation conditions, thereby adapting to different formations and improving drilling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

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

[0035] Figure 2 A schematic diagram of the structure of an adjustment mechanism provided by an embodiment of the present invention;

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

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

[0038] Figure 5 A schematic diagram of the structure of a pendulum provided by an embodiment of the present invention;

[0039] Figure 6 A schematic diagram of the structure of a fixed cover provided in an embodiment of the present invention;

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

[0041] Icon: 1-power casing; 2-screw rotor;

[0042] 3-static valve disc; 3.1-flow channel;

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

[0044] 5-fixed cover; 5.1-second flow hole;

[0045] 6-small magnet block; 7-large magnet block; 8-magnet connector; 9-screw stator; 10-upper valve disc; 11-rotor auxiliary rod; 12-connector; 13-oscillation sleeve; 14-piston; 15-spline shaft; 16-disc spring; 17-spline center tube; 18-power upper connector; 19-oscillation upper connector; 20-piston positioning block; 21-piston rod. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0049] The existing hydraulic oscillator is generally composed of a power sub, a valve shaft assembly and an oscillation sub. The screw motor in the power sub drives the valve plate of the valve shaft assembly to rotate continuously, realizing the periodic change of the flow area, so as to change the pressure, so that the pressure in the tool flow channel fluctuates, thereby driving the oscillation sub to generate reciprocating thrust on the drill string. It can be seen from this that the flow area of ​​the existing hydraulic oscillator cannot be adaptively adjusted according to the actual drilling situation, and thus cannot adapt to the increasing number of oil field drilling methods.

[0050] In view of this, the present invention provides a magnetic hydraulic oscillator, including a power short section, the power short section includes a power sleeve 1, a screw rotor 2 and an adjusting mechanism; the screw rotor 2 is arranged in the power sleeve 1 and rotates with the power sleeve 1; the adjusting mechanism is arranged in the power sleeve 1, including 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, and around the axis of the concave spherical surface, a plurality of flow channels 3.1 distributed at intervals are provided on the concave spherical surface, 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 is away from the concave spherical surface. The pendulum 4 is arranged between the static valve disc 3 and the fixed cover 5, one end of which is a spherical end adapted to the concave spherical surface, and a plurality of first flow holes 4.1 are arranged on the spherical end around the axis of the spherical end, and the other end is ball-hinged with the fixed cover 5, and a transmission assembly is arranged between the pendulum 4 and the screw rotor 2; the transmission assembly can drive the pendulum 4 to swing when the screw rotor 2 rotates, and the swing amplitude is proportional to the rotation speed of the screw rotor 2.

[0051] In the magnetic hydraulic oscillator, when the drilling fluid enters the power casing 1 and flows through the screw rotor 2, the fixed cover 5, the pendulum 4 and the static valve disc 3 in sequence, the screw rotor 2 rotates first, and the speed of the screw rotor 2 depends on the oscillation frequency of the drilling fluid; when the screw rotor 2 rotates, the pendulum 4 is driven to swing through the transmission component. When the oscillation frequency is higher, the speed of the screw rotor 2 is higher. Correspondingly, the swing amplitude of the spherical end of the pendulum 4 is larger, so that the angle with the axis of the static valve disc 3 is larger. When the inner diameter of the concave spherical surface is larger, the flow area through which the drilling fluid can pass is larger. When the oscillation frequency is smaller, the speed of the screw rotor 2 becomes smaller. Correspondingly, the swing amplitude of the spherical end of the pendulum 4 is reduced, so that the angle with the axis of the static valve disc 3 is reduced, and the flow hole area between the pendulum 4 and the static valve disc 3 is also reduced. In this way, the purpose of controlling the flow area of ​​the drilling fluid to adjust the frequency of drilling fluid pressure change is achieved.

[0052] It can be seen that compared with the existing technology, the 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 are described in detail:

[0054] Regarding the power sub, specifically:

[0055] refer to Figures 1 to 6 The power short section is composed of a power upper joint 18, a power sleeve 1, an adjusting mechanism, a screw rotor 2, a screw stator 9, a rotor auxiliary rod 11, an upper valve disc 10 and a connecting head 12.

[0056] As mentioned above, one end of the power upper joint 18 is threadedly connected to the power casing 1, so that when the drill pipe drives the power upper joint 18 to rotate, the torque can be transmitted downward; the other end of the power casing 1 is threadedly connected to the connector 12, and the connector 12 is threadedly connected to the oscillation short section, thereby achieving the effect of transmitting the torque generated by the drill pipe.

[0057] Continuing with the above, inside one end of the power sleeve 1 is an adjustment mechanism, which is composed of a static valve disc 3, a pendulum 4, a fixed cover 5, a small magnet block 6, a large magnet block 7 and a magnet joint 8. A sealing hole is arranged on the outer side of the static valve disc 3, which contacts with the power sleeve 1 through a sealing ring, so as to achieve a good sealing effect. One side of the static valve disc 3 is a concave spherical surface, and at the same time, there are many trapezoidal holes (i.e., flow channels 3.1) around the center of the circle on the static valve disc 3, and the farther away from the center of the circle, the larger the trapezoidal bottom; the pendulum 4 is in contact with one end of the spherical surface of the static valve disc 3, and one end of the pendulum 4 is a spherical end, and the spherical end is provided with a plurality of first flow holes 4.1, and the other end of the pendulum 4 is spherically hinged with the fixed cover 5 and provided with two small magnet blocks 6; a plurality of second flow holes 5.1 are arranged on the fixed cover 5 connected to the pendulum 4 by an articulated manner, mainly to allow the pendulum 4 to swing while still not affecting the change of the flow velocity.

[0058] Please continue with the above. A screw rotor 2 is also provided inside the power casing 1. A magnet joint 8 is provided on the screw rotor 2. The magnet joint 8 and the screw rotor 2 are interference fit, so that the magnet joint 8 can be driven to rotate together when the screw rotor 2 rotates. Two large magnet blocks 7 with different magnetic poles are installed on the magnet joint 8 to attract the small magnet block 6 so that the pendulum 4 can swing around its hinged end. As the oscillation frequency of the drilling fluid gradually increases, the faster the screw rotor 2 rotates, the larger magnet block 7 on the screw rotor 2 will also rotate faster synchronously. At this time, the small magnet block 6 will drive the pendulum 4 to swing due to the suction force of the large magnet block 7. Due to the fast rotation speed, the suction force generated will cause the pendulum 4 to swing with a larger amplitude, and the angle between the pendulum 4 and the axis of the static valve disc 3 will become larger. The larger the inner diameter of the static valve disc 3, the larger the hole area that the drilling fluid can pass through, thereby achieving a regulating effect.

[0059] In addition to the above, it should be added that there is a rotor auxiliary rod 11 inside the screw rotor 2 to assist the screw rotor 2 in self-rotation to ensure that the screw rotor 2 does not deviate; the lower end of the screw rotor 2 is an upper valve disc 10, and the upper valve disc 10 is provided with many arc-shaped slots, through which the 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 casing 1, so that the screw rotor 2 can rotate while rotating in the screw stator 9.

[0060] Regarding the oscillation nipple, specifically:

[0061] refer to Figure 7 The oscillation short section is composed of an oscillation upper joint 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] In connection with the above, one end of the oscillating upper joint 19 is connected to the connector 12 by a thread, so that the torque generated by the drill pipe is transmitted to the connector 12 through the power upper joint 18, and then the transmission of the oscillating short joint is driven, and the other end is connected to the oscillating sleeve 13 by a thread; a piston positioning block 20 is arranged in the oscillating sleeve 13, one end of the piston positioning block 20 is in contact with the oscillating upper joint 19, and the other end is in contact with the piston 14, and a piston rod 21 is arranged in the piston 14, and the other end of the piston rod 21 is connected to the spline shaft 15 by a thread, and a disc spring is arranged between the spline shaft 15 and the oscillating sleeve 13. 16, the lower end of the disc spring 16 is in contact with the spline center tube 17, and at the same time, the inside of the spline center tube 17 is in contact with the spline shaft 15. When the spline center tube 17 is rotated, the spline shaft 15 will be driven to rotate due to the spline teeth arranged inside the spline center tube 17, thereby realizing the function of transmitting torque, and thus enabling the spline shaft 15 to continue to transmit torque; an assembly shoulder is arranged on one end of the piston rod 21, and a piston positioning block 20 is installed on the upper end of the piston rod 21 through a thread, and the piston 14 is fixedly connected with the piston rod 21 through the piston positioning block 20 and the assembly shoulder.

[0063] Continuing with the above, the design of the piston 14 is to be pushed and moved under the impact of the drilling fluid. The pressure of the drilling fluid forms a thrust on the piston 14 and pushes the spline shaft 15 to move through the piston rod 21. Due to the design of the flow hole of the upper valve disc 10 and the design of the regulating mechanism, the pressure of the drilling fluid can change according to the oscillation frequency, so the thrust of the piston 14 on the spline shaft 15 will also change; the frequency of change of the thrust of the piston 14 on the spline shaft 15 is the same as the frequency of change of the drilling fluid pressure, which makes the change of the thrust of the piston 14 on the spline shaft 15 controlled by the regulating mechanism. When the drilling fluid pressure is greater than the elastic force of the disc spring 16, the drilling fluid impacts the piston 14 to push the spline shaft 15 downward. When the drilling fluid pressure is less than the elastic force of the disc spring 16, the piston 14 needs to be reset to return to its 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 deformation and release this energy after the external force disappears. Therefore, the disc spring 16 can push the piston 14 through its elastic force, overcome the reverse effect of the drilling fluid pressure, and then the piston 14 drives 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 through the oscillating upper joint 19, the upper valve disc 10, the screw stator 9, the screw rotor 2, the fixed cover 5, the pendulum 4, and the static valve disc 3 in sequence; when the drilling fluid is between the upper valve disc 10 and the fixed cover 5, the drilling fluid flows between the screw stator 9 and the screw rotor 2, driving the screw rotor 2 to rotate, and the screw rotor 2 will drive the magnet joint 8 to rotate together. When the oscillation frequency is larger, the large magnet block 7 attracts the small magnet block 6, which will cause the pendulum 4 to swing more, and the flow hole between the pendulum 4 and the static valve disc 3 The area will also increase, thereby achieving the purpose of controlling the flow area of ​​the drilling fluid to adjust the pressure change frequency of the drilling fluid; the drilling fluid with changing pressure impacts the piston 14 through the connecting head 12 and the oscillating upper joint 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 and drives the spline shaft 15 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 and drives the spline shaft 15 to reset upward through the piston rod 21, thereby achieving an oscillation effect.

[0066] The magnetic hydraulic oscillator transports the drilling fluid to the power nipple by the flow of drilling fluid, which flows through the upper valve disc 10 to rotate the screw rotor 2, and the rotor auxiliary rod 11 assists in rotation. At the power nipple, the drilling fluid flows through the fixed cover 5 and the flow channel 3.1 between the pendulum 4 and the static valve disc 3. When in an oscillating state, the relative area of ​​the flow channel 3.1 changes, resulting in a change in the flow area, so that the drilling fluid pressure generated by the change in the flow area pushes the piston 14, thereby causing the disc spring 16 and the spline shaft 15 to oscillate; the magnetic hydraulic oscillator can adaptively change the flow area according to the current frequency of oscillation, thereby being able to increase the oscillation frequency faster, improve drilling efficiency, solve the current problem of low efficiency in oil drilling, improve drilling stability, shorten the construction period, and promote 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, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 magnetic hydraulic oscillator, characterized in that: include: A power short section, the power short section comprising a power sleeve (1), a screw rotor (2) and an adjustment mechanism; The screw rotor (2) is disposed in the power sleeve (1) and is rotationally matched with the power sleeve (1); The regulating mechanism is arranged in the power sleeve (1), and comprises 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, and around the axis of the concave spherical surface, a plurality of flow passages (3.1) are provided on the concave spherical surface at intervals, one end of each of the flow passages (3.1) is connected to each other at the center of the concave spherical surface, and the other end extends in a direction away from the center of the concave spherical surface, and the cross section of the flow passage (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 arranged between the static 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, a plurality of first flow holes (4.1) are arranged on the spherical end, and the other end is spherically hinged with the fixed cover (5), and a transmission component is arranged between the pendulum and the screw rotor (2); The transmission component can drive the pendulum (4) to swing when the screw rotor (2) rotates, and the swing amplitude is proportional to the rotation speed of the screw rotor (2).

2. The magnetic hydraulic oscillator according to claim 1, characterized in that: The transmission assembly comprises two small magnet blocks (6) and two large magnet blocks (7); The two small magnet blocks (6) are arranged at intervals on the pendulum (4), and the magnetic poles of the two small magnet blocks (6) are consistent; The two large magnet blocks (7) are arranged at intervals 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 the two large magnet blocks (7) are arranged on the magnet joint (8).

4. The magnetic hydraulic oscillator according to claim 1, characterized in that: A sealing ring is embedded outside the static valve disc (3), and the sealing ring abuts against the inner wall of the power sleeve (1).

5. The magnetic hydraulic oscillator according to claim 1, characterized in that: The fixed cover (5) is provided with a second flow hole (5.1) penetrating the fixed cover, 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 also includes a screw stator (9) and an upper valve disc (10); The screw stator (9) is fixed in the power casing (1) and sleeved on the screw rotor (2); The upper valve disc (10) is fixed in the power sleeve (1) and is located at the end of the screw rotor (2) away from the pendulum (4), and is connected to the screw stator (9).

7. The magnetic hydraulic oscillator according to claim 6, characterized in that: The power sub also includes a rotor auxiliary rod (11), and the rotor auxiliary rod (11) is plug-fitted with the screw rotor (2), and the axes of the two coincide.

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

9. The magnetic hydraulic oscillator according to claim 8, characterized in that: The oscillating short section comprises an oscillating sleeve (13), a piston (14), a spline shaft (15) and a disc spring (16); The piston (14) is fixedly connected to the spline shaft (15), and both are inserted into the oscillating sleeve (13), and the piston (14) is sealed and matched with the inner wall of the oscillating sleeve (13); The disc spring (16) is located inside the oscillating sleeve (13) and is 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 magnetic hydraulic oscillator according to claim 9, characterized in that: The oscillating sub also includes a splined center tube (17); The spline center tube (17) is located in the oscillating sleeve (13), is sleeved on the spline shaft (15), and is key-connected to the spline shaft (15); The other end of the disc spring (16) is connected to the spline center tube (17).

Images