Pressure balancing piece for continuous wave mud pulse generator

Abstract

The invention discloses a pressure balancing part for a continuous wave mud pulse generator, and relates to the technical field of underground drilling tool equipment. The device comprises an axially telescopic transmission shaft piece and an auxiliary transmission piece, the auxiliary transmission piece is fixed on a mounting sleeve of the pulse generator, a rotary valve of the pulse generator is connected to a telescopic shaft of the transmission shaft piece, and the telescopic shaft of the transmission shaft piece penetrates through the rotary valve to be connected with the auxiliary transmission piece. A rotary valve rotor of the rotary valve is fixedly connected with a telescopic shaft of the transmission shaft piece, and a rotary valve stator is rotationally connected with the rotary valve rotor; when the transmission shaft piece drives the rotary valve rotor to rotate relative to the rotary valve stator, the telescopic shaft drives the rotary valve to integrally move in the axial direction of the mounting sleeve under the connection matching of the telescopic shaft of the transmission shaft piece and the auxiliary transmission piece. In the slurry throughput change process of the rotary valve, the rotary valve is made to make adaptive movement along the rotating axis of the rotary valve through the cooperation effect of the transmission shaft piece capable of stretching and retracting in the axial direction and the auxiliary transmission piece, so that the pressure at the position of the rotary valve is dynamically balanced.

Description

Technical Field

[0001] This invention relates to the field of downhole drilling equipment technology, particularly to the field of mud pulse generator technology in downhole drilling equipment, and more specifically to a pressure balancing component for a continuous wave mud pulse generator applied in the field of drilling engineering. Background Technology

[0002] The mud pulse generator is the most important part of the wireless measurement while drilling instrument. It is used in the high temperature, high pressure and strong vibration mud environment downhole, and requires good adaptability, high reliability, good signal quality and simple maintenance.

[0003] During operation, high-pressure drilling fluid passes through the interior of the continuous wave mud pulse generator. The rotary valve in each component needs to withstand a large pressure, which can easily cause damage and affect the overall service life of the mud pulse generator. Therefore, it is necessary to redesign the relevant components inside the continuous wave mud pulse generator to make the distribution between the components more balanced and reduce the pressure at the rotary valve.

[0004] For example, the utility model patent with authorization announcement number CN206246119U, authorization announcement date June 13, 2017, entitled "Pressure Balancing Component for Continuous Wave Mud Pulse Generator," includes a housing, and a drive shaft, a pressure-bearing support, and a rotary valve relatively fixedly mounted within the housing. The rotary valve includes a rotor cylinder and a stator cylinder driven by the drive shaft. The pressure-bearing support is mounted above the rotary valve and cooperates with the rotor cylinder. The lower section of the drive shaft has multiple steps, and its lower end passes through the pressure-bearing support and has external threads. The inner wall of the rotor cylinder has internal threads that cooperate with the lower end of the drive shaft. The upper section of the rotor cylinder has a radially extended pressure-bearing annular cavity. The lower section of the rotor cylinder is narrower than the upper section, and a rotor side hole is opened on its side wall. The drive shaft has a flow-guiding blind hole along its axial direction, and a flow-guiding side hole is provided on its side, connecting the pressure-bearing annular cavity and the flow-guiding blind hole. This utility model has a simple structure and compact layout, which can effectively reduce the pressure at the rotary valve during use and help extend the overall service life of the mud pulse generator.

[0005] Based on the above search and combined with existing technology, it was found that the pressure balancing components for existing continuous wave mud pulse generators are difficult to automatically adjust the pressure according to the changes in the allowable mud flow of the rotary valve, resulting in poor applicability. Therefore, a pressure balancing component for continuous wave mud pulse generators is proposed to improve the above problems. Summary of the Invention

[0006] To overcome the defects and shortcomings of the existing technology, this invention provides a pressure balancing component for a continuous wave mud pulse generator. The purpose of this invention is to solve the problem that existing pressure balancing components for continuous wave mud pulse generators are difficult to automatically adjust pressure according to changes in the allowable mud flow rate of the rotary valve, resulting in poor applicability. The pressure balancing component for a continuous wave mud pulse generator provided by this invention includes an axially extendable drive shaft and an auxiliary drive component. The auxiliary drive component is fixed on the mounting sleeve of the pulse generator and coaxially arranged with the drive shaft. The rotary valve of the pulse generator is connected to the telescopic shaft of the drive shaft. The telescopic shaft of the drive shaft passes through the rotary valve and connects to the auxiliary drive component. The rotary valve rotor is fixedly connected to the telescopic shaft of the drive shaft, and the rotary valve stator is sleeved on the telescopic shaft of the drive shaft. When the drive shaft rotates, it drives the rotary valve rotor to rotate relative to the rotary valve stator. Simultaneously, with the connection and cooperation of the telescopic shaft of the drive shaft and the auxiliary drive component, the telescopic shaft of the drive shaft drives the rotary valve rotor and the rotary valve stator to move axially along the mounting sleeve. In the process of the change in the amount of mud passing between the rotating rotor and the rotating valve stator, the present invention utilizes the cooperation of the axially extendable transmission shaft and the auxiliary transmission component to make the entire rotating valve move adaptively along its rotation axis, so as to dynamically balance the pressure at the rotating valve.

[0007] To address the problems existing in the prior art, the present invention is achieved through the following technical solution.

[0008] This invention provides a pressure balancing component for a continuous wave mud pulse generator, comprising an axially extendable drive shaft and an auxiliary drive component. The auxiliary drive component is fixed on the mounting sleeve of the pulse generator and coaxially arranged with the drive shaft. The rotary valve of the pulse generator is connected to the telescopic shaft of the drive shaft, which passes through the rotary valve and connects to the auxiliary drive component. The rotary valve rotor is rotatably connected to the rotary valve stator. The rotary valve rotor is fixedly connected to the telescopic shaft of the drive shaft, and the rotary valve stator is sleeved on the telescopic shaft of the drive shaft. When the drive shaft rotates, it drives the rotary valve rotor to rotate relative to the rotary valve stator. Simultaneously, with the connection and cooperation between the telescopic shaft of the drive shaft and the auxiliary drive component, the telescopic shaft of the drive shaft drives the rotary valve rotor and the rotary valve stator to move axially along the mounting sleeve.

[0009] More preferably, the rotary valve rotor is located on the output side of the rotary valve stator facing the mud, and the auxiliary transmission component is located on the side of the rotary valve rotor away from the rotary valve stator.

[0010] More preferably, during the process of the transmission shaft driving the rotary valve rotor to rotate, thereby increasing the amount of slurry passing between the rotary valve rotor and the rotary valve stator, the telescopic shaft, in cooperation with the auxiliary transmission component, moves the rotary valve in a direction away from the slurry conveying direction; during the process of the transmission shaft driving the rotary valve rotor to rotate, thereby increasing the amount of slurry passing between the rotary valve rotor and the rotary valve stator, the telescopic shaft, in cooperation with the auxiliary transmission component, moves the rotary valve in a direction towards the slurry conveying direction.

[0011] More preferably, the transmission shaft component includes a fixed rotating shaft, a transmission key shaft, and a telescopic shaft. The fixed rotating shaft is coaxially connected to the telescopic shaft via the transmission key shaft. The transmission key shaft transmits the torque of the fixed rotating shaft to the telescopic shaft, and causes the telescopic shaft to move axially relative to the fixed rotating shaft with the cooperation of the auxiliary transmission component when it rotates.

[0012] More preferably, one end of the transmission key shaft is fixedly connected to the fixed rotating shaft, and the telescopic shaft is provided with a limiting groove for the transmission key shaft to be inserted.

[0013] More preferably, the auxiliary transmission component includes a support frame and an internally threaded sleeve, wherein the internally threaded sleeve is fixed inside the mounting sleeve by the support frame.

[0014] In a more preferred embodiment, the telescopic shaft of the transmission shaft is inserted into the internal threaded sleeve and threadedly engaged with the internal threaded sleeve. When the transmission shaft reciprocates, under the threaded engagement of the telescopic shaft and the auxiliary transmission component, the telescopic shaft drives the rotary valve stator and rotary valve rotor to reciprocate along the axial direction of the mounting sleeve.

[0015] More preferably, the upper end of the internal threaded sleeve is closed, and a first vent hole is provided inside the telescopic shaft, which connects the cavity formed between the telescopic shaft and the internal threaded sleeve with the limiting slide groove.

[0016] More preferably, the telescopic shaft of the transmission shaft and the internal threaded sleeve form a variable pitch screw assembly. When the transmission shaft rotates continuously in one direction, under the cooperation of the variable pitch screw assembly formed by the telescopic shaft and the internal threaded sleeve, the telescopic shaft drives the rotary valve stator and rotary valve rotor to reciprocate along the axial direction of the mounting sleeve.

[0017] More preferably, a limiting component for limiting the rotation of the rotary valve stator is provided between the rotary valve stator and the mounting sleeve.

[0018] More preferably, the limiting component is a telescopic limiting component, with one end of the limiting component fixedly mounted on the inner wall of the mounting sleeve, and the other end fixedly connected to the stator of the rotary valve. The end of the limiting component fixedly connected to the stator of the rotary valve can be axially telescopic relative to the end fixedly connected to the mounting sleeve.

[0019] More preferably, the limiting assembly includes an L-shaped limiting rod and a limiting sleeve. The L-shaped limiting rod is fixed to the inner wall of the mounting sleeve, and the limiting sleeve is fixed to the side end of the rotary valve stator and sleeved on the outside of the L-shaped limiting rod.

[0020] More preferably, the limiting sleeve is sealed, and the end of the L-shaped limiting rod that extends into the limiting sleeve is fixed with a limiting slider, which is slidably assembled inside the limiting sleeve; the limiting slider divides the sealed limiting sleeve cavity into left and right chambers.

[0021] More preferably, the limiting slider is provided with a second vent hole, which connects the left and right chambers separated by the limiting slider.

[0022] More preferably, the inner wall of the mounting sleeve, the surface of the transmission key shaft and the L-shaped limiting rod are all coated with a wear-resistant non-stick coating.

[0023] Compared with the prior art, the beneficial technical effects of the present invention are as follows: 1. This invention, through the cooperation of an axially extendable transmission shaft and an auxiliary transmission component, enables the transmission shaft to drive the rotary valve rotor to rotate, simultaneously causing the rotary valve to move axially along the mounting sleeve. Furthermore, through the connection between the auxiliary transmission component and the telescopic shaft of the axially extendable transmission shaft, as the transmission shaft drives the rotary valve rotor to rotate, increasing the amount of slurry flowing between the rotor and stator, the telescopic shaft, in cooperation with the auxiliary transmission component, moves the rotary valve away from the slurry delivery direction. Conversely, as the transmission shaft drives the rotary valve rotor to rotate, increasing the amount of slurry flowing between the rotor and stator, the telescopic shaft, in cooperation with the auxiliary transmission component, moves the rotary valve in the direction of slurry delivery. In other words, the pressure balancing component provided by this invention can automatically adjust the pressure according to changes in the allowable slurry flow through the rotary valve, dynamically balancing the pressure at the rotary valve, which helps extend the overall service life of the slurry pulse generator.

[0024] 2. This invention uses a retractable transmission shaft and an auxiliary transmission component as pressure balancing components. Compared with the existing pressure balancing component structure of continuous wave mud pulse generators, the structure of this invention is simple. It only requires adjusting the matching relationship between the retractable shaft of the transmission shaft and the auxiliary transmission component to achieve the effect of dynamically balancing the pressure at the rotary valve.

[0025] 3. Existing pressure balancing devices achieve pressure balance at the rotary valve by changing the distance between the rotor and stator. However, this method causes significant changes in the mud flow between the rotor and stator, affecting the pulse accuracy of the pulse generator. The pressure balancing device of this invention drives the entire rotary valve axially, rather than just the rotor. When dynamically balancing the pressure at the rotary valve, it does not change the mud flow between the rotor and stator, and therefore does not affect the mud pulse accuracy of the pulse generator. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the rotary valve rotor in this application. Figure 2 This is a schematic diagram of the overall three-dimensional structure of the rotary valve stator in this application. Figure 3 This is a cross-sectional structural diagram of the present application with the transmission shaft and rotary valve rotor removed. Figure 4 This is a three-dimensional structural diagram of the transmission shaft and rotary valve rotor of this application; Figure 5 This is a cross-sectional view of the limiting component in this application; Figure 6 This is a schematic diagram of the planar structure of the rotary valve of this application when it is moved toward the side away from the direction of mud conveying; Figure 7 This is a schematic diagram of the planar structure of the rotary valve of this application in the state of moving towards the side facing the mud conveying direction; Figure 8 This is a schematic diagram of the planar structure of the telescopic shaft of this application in the state of moving towards the side of the mud conveying direction; Figure 9 This is a schematic diagram of the planar structure of the telescopic shaft of this application when it is moving away from the direction of mud conveying. Reference numerals: 1. Mounting sleeve; 2. Transmission shaft; 21. Fixed rotating shaft; 22. Telescopic shaft; 2201. Limiting groove; 2202. First vent; 23. Transmission key shaft; 3. Rotary valve rotor; 4. Rotary valve stator; 5. Auxiliary transmission component; 51. Support frame; 52. Internal threaded sleeve; 6. Limiting assembly; 61. L-shaped limiting rod; 62. Limiting sleeve; 63. Limiting slider; 6301. Second vent. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0029] Example 1 As a preferred embodiment of the present invention, please refer to the appendix to the specification. Figure 1 -Appendix Figure 4 As shown, this embodiment provides a pressure balancing component for a continuous wave mud pulse generator, including an axially extendable transmission shaft 2 and an auxiliary transmission component 5. The auxiliary transmission component 5 is fixed on the mounting sleeve 1 of the pulse generator and is coaxially arranged with the transmission shaft 2. The rotary valve of the pulse generator is connected to the telescopic shaft 22 of the transmission shaft 2. The telescopic shaft 22 of the transmission shaft 2 passes through the rotary valve and is connected to the auxiliary transmission component 5. The rotary valve rotor 3 is rotatably connected to the rotary valve stator 4. The rotary valve rotor 3 is fixedly connected to the telescopic shaft 22 of the transmission shaft 2, and the rotary valve stator 4 is sleeved on the telescopic shaft 22 of the transmission shaft 2. When the transmission shaft 2 rotates, it drives the rotary valve rotor 3 to rotate relative to the rotary valve stator 4. At the same time, with the connection and cooperation between the telescopic shaft 22 of the transmission shaft 2 and the auxiliary transmission component 5, the telescopic shaft 22 of the transmission shaft 2 drives the rotary valve rotor 3 and the rotary valve stator 4 to move together along the axial direction of the mounting sleeve 1.

[0030] In this embodiment, during the rotation of the telescopic shaft 22, with the cooperation of the auxiliary transmission component 5, the rotary valve as a whole is driven to move axially, so as to achieve dynamic balance of pressure at the rotary valve, which helps to extend the overall service life of the mud pulse generator.

[0031] As one implementation method of this embodiment, please refer to the appendix to the specification. Figure 6 and attached Figure 7As shown, the rotary valve rotor 3 is located on the output side of the rotary valve stator 4 facing the mud, and the auxiliary transmission component 5 is located on the side of the rotary valve rotor 3 away from the rotary valve stator 4. During the process where the transmission shaft 2 drives the rotary valve rotor 3 to rotate, thereby increasing the amount of mud passing between the rotary valve rotor 3 and the rotary valve stator 4, the telescopic shaft 22, in cooperation with the auxiliary transmission component 5, moves the rotary valve in a direction away from mud delivery; during the process where the transmission shaft 2 drives the rotary valve rotor 3 to rotate, thereby increasing the amount of mud passing between the rotary valve rotor 3 and the rotary valve stator 4, the telescopic shaft 22, in cooperation with the auxiliary transmission component 5, moves the rotary valve in the direction of mud delivery.

[0032] Existing pressure balancing devices achieve pressure balance at the rotary valve by changing the distance between the rotary valve rotor 3 and the rotary valve stator 4. However, this method causes significant changes in the mud flow between the rotary valve rotor 3 and the rotary valve stator 4, affecting the pulse accuracy of the pulse generator. The pressure balancing device of this invention drives the entire rotary valve axially, rather than just the rotary valve rotor 3. When dynamically balancing the pressure at the rotary valve, it does not change the mud flow between the rotary valve rotor 3 and the rotary valve stator 4, and therefore does not affect the mud pulse accuracy of the pulse generator.

[0033] Example 2 As another preferred embodiment of the present invention, this embodiment is a further detailed supplement and explanation of the technical solution of the present invention based on the above-described embodiment 1. In this embodiment, as a specific implementation of the axially extendable transmission shaft 2, please refer to the appendix to the specification. Figure 4 As shown, the transmission shaft component 2 includes a fixed rotating shaft 21, a transmission key shaft 23, and a telescopic shaft 22. The fixed rotating shaft 21 is coaxially connected to the telescopic shaft 22 through the transmission key shaft 23. The transmission key shaft 23 transmits the torque of the fixed rotating shaft 21 to the telescopic shaft 22, and causes the telescopic shaft 22 to move axially relative to the fixed rotating shaft 21 with the cooperation of the auxiliary transmission component 5 when it rotates.

[0034] The fixed rotating shaft 21 is connected to the drive motor that drives the rotary valve to rotate, and transmits the torque of the drive motor to the telescopic shaft 22, thereby achieving the purpose of driving the rotary valve rotor 3 to rotate.

[0035] This embodiment only requires changing the axial distance between the telescopic shaft 22 and the fixed rotating shaft 21. This eliminates the need to change the position of the drive motor. The entire rotary valve can be moved axially by the telescopic shaft 22, making the structure simpler.

[0036] As an example of this embodiment, the transmission key shaft 23 can be a square shaft or a spline shaft.

[0037] As another example of this embodiment, one end of the transmission key shaft 23 is fixedly connected to the fixed rotating shaft 21, and the telescopic shaft 22 is provided with a limiting groove 2201 for the transmission key shaft 23 to be inserted.

[0038] As an equivalent replacement, the specific configuration is as follows: one end of the transmission key shaft 23 is fixedly connected to the telescopic shaft 22, and a limiting groove 2201 for the transmission key shaft 23 to be inserted is provided in the fixed rotating shaft 21.

[0039] In this embodiment, as a specific implementation of the auxiliary transmission component 5, please refer to the appendix of the specification. Figure 3 As shown, the auxiliary transmission component 5 includes a support frame 51 and an internal threaded sleeve 52, wherein the internal threaded sleeve 52 is fixed inside the mounting sleeve 1 by the support frame 51.

[0040] As an example of this embodiment, the telescopic shaft 22 of the transmission shaft 2 is inserted into the internal threaded sleeve 52 and is threadedly engaged with the internal threaded sleeve 52. When the transmission shaft 2 reciprocates, under the threaded engagement of the telescopic shaft 22 and the auxiliary transmission component 5, the telescopic shaft 22 drives the rotary valve stator 4 and the rotary valve rotor 3 to reciprocate along the axial direction of the mounting sleeve 1.

[0041] As another example of this embodiment, refer to the appendix to the specification. Figure 8 and attached Figure 9 As shown, the upper end of the internally threaded sleeve 52 is closed, and a first vent hole 2202 is provided inside the telescopic shaft 22. The first vent hole 2202 connects the cavity formed between the telescopic shaft 22 and the internally threaded sleeve 52 with the limiting slide groove 2201. The first vent hole 2202 ensures that the air pressure inside the internally threaded sleeve 52 and the limiting slide groove 2201 are balanced.

[0042] As another example of this embodiment, the telescopic shaft 22 of the transmission shaft 2 and the internal threaded sleeve 52 form a variable pitch screw assembly. When the transmission shaft rotates continuously in one direction, under the cooperation of the variable pitch screw assembly formed by the telescopic shaft 22 and the internal threaded sleeve 52, the telescopic shaft 22 drives the rotary valve stator 4 and the rotary valve rotor 3 to reciprocate along the axial direction of the mounting sleeve 1.

[0043] Example 3 As another preferred embodiment of the present invention, this embodiment further elaborates and supplements the technical solution of the present invention based on the above embodiment 1 or embodiment 2. In this embodiment, as a preferred implementation, a limiting component 6 for limiting the rotation of the rotary valve stator 4 is provided between the rotary valve stator 4 and the mounting sleeve 1.

[0044] As an example of this embodiment, the limiting component 6 may be a limiting key opened on the inner wall of the mounting sleeve 1, and the rotary valve stator 4 may move axially along the limiting key.

[0045] As another example of this embodiment, refer to the appendix to the specification. Figure 2 and attached Figure 3 As shown, the limiting component 6 is a telescopic limiting component 6. One end of the limiting component 6 is fixedly mounted on the inner wall of the mounting sleeve 1, and the other end is fixedly connected to the rotary valve stator 4. The end of the limiting component 6 that is fixedly connected to the rotary valve stator 4 can be axially extended and retracted relative to the end that is fixedly connected to the mounting sleeve 1.

[0046] Furthermore, please refer to the instruction manual appendix. Figure 5 As shown, the limiting component 6 includes an L-shaped limiting rod 61 and a limiting sleeve 62. The L-shaped limiting rod 61 is fixed to the inner wall of the mounting sleeve 1, and the limiting sleeve 62 is fixed to the side end of the rotary valve stator 4 and sleeved on the outside of the L-shaped limiting rod 61.

[0047] Furthermore, to ensure smooth operation of the limiting component 6 and prevent its displacement, the limiting sleeve 62 is hermetically sealed. A limiting slider 63 is fixed to the end of the L-shaped limiting rod 61 that extends into the limiting sleeve 62. The limiting slider 63 is slidably assembled within the limiting sleeve 62. The limiting slider 63 divides the sealed cavity of the limiting sleeve 62 into left and right chambers. A second vent 6301 is provided on the limiting slider 63, connecting the left and right chambers separated by the limiting slider 63.

[0048] Since the transmission shaft 2, mounting sleeve 1, limiting component 6, and other components of this application are all in the mud, and the transmission shaft needs to extend and retract, the limiting component 6 also needs to extend and retract, the rotary valve rotor 3 needs to rotate relative to the mounting sleeve 1, and the rotary valve stator 4 needs to move axially relative to the mounting sleeve 1, in order to avoid the mud causing the transmission shaft 2 and the limiting component 6 to be blocked during extension and retraction, as well as the rotary valve rotor 3 to rotate and the rotary valve stator 4 to move axially, a wear-resistant non-stick coating is applied to the inner wall of the mounting sleeve 1, the transmission key shaft 23, and the L-shaped limiting rod 61.

[0049] Example 4 As a preferred embodiment of the present invention, this embodiment discloses a pressure balancing component for a continuous wave mud pulse generator, as shown in the appendix to the specification. Figure 1 -Appendix Figure 9As shown, the device includes a transmission shaft 2 and an auxiliary transmission component 5 installed between the mounting sleeve 1 and the rotary valve. The transmission shaft 2 includes a fixed rotating shaft 21, a telescopic shaft 22, and a transmission key shaft 23. The transmission key shaft 23 is movably installed between the fixed rotating shaft 21 and the telescopic shaft 22. The rotary valve includes a rotary valve rotor 3 and a rotary valve stator 4. The rotary valve rotor 3 is coaxially fixed on the telescopic shaft 22, and the rotary valve stator 4 is coaxially rotatably sleeved on the telescopic shaft 22. The rotary valve rotor 3 and the rotary valve stator 4 are rotatably connected, and the rotary valve rotor 3 is located on the side of the rotary valve stator 4 facing the mud output. A limit component 6 is installed between the side of the rotary valve stator 4 away from the rotary valve rotor 3 and the mounting sleeve 1.

[0050] Specifically, regarding the limiting component 6, such as... Figure 5 As shown, the limiting assembly 6 includes an L-shaped limiting rod 61, a limiting sleeve 62, and a limiting slider 63. The L-shaped limiting rod 61 is fixed to the inner wall of the mounting sleeve 1. The limiting sleeve 62 is fixed to the side end of the rotary valve stator 4 and sleeved on the outside of the L-shaped limiting rod 61. The limiting slider 63 is fixed to the end of the L-shaped limiting rod 61 located inside the limiting sleeve 62 and slides with the limiting sleeve 62. A second vent hole 6301 is provided on the limiting slider 63.

[0051] Auxiliary transmission component 5 is located on the side of the rotary valve rotor 3 away from the rotary valve stator 4. Specifically, regarding auxiliary transmission component 5, such as... Figure 3 As shown, the auxiliary transmission component 5 includes a support frame 51 and an internal threaded sleeve 52. The internal threaded sleeve 52 is fixed to the inner wall of the mounting sleeve 1 through the support frame 51. The telescopic shaft 22 is threadedly connected to the internal threaded sleeve 52. One end of the transmission key shaft 23 is coaxially fixed with the fixed rotating shaft 21. The telescopic shaft 22 is provided with a limiting groove 2201 that is slidably adapted to the transmission key shaft 23 on the side end near the fixed rotating shaft 21. This ensures that while the fixed rotating shaft 21 drives the telescopic shaft 22 to rotate synchronously through the transmission key shaft 23, the telescopic shaft 22 can move along its rotation axis with the rotary valve under the threaded engagement with the internal threaded sleeve 52.

[0052] Based on the above structural configuration, the following can be achieved: When the fixed rotating shaft 21 drives the telescopic shaft 22 to rotate via the transmission key shaft 23, the telescopic shaft 22 drives the rotary valve rotor 3 to rotate. At the same time, the telescopic shaft 22 moves along its own length direction under the threaded engagement with the internal threaded sleeve 52, thereby moving the rotary valve along its rotation axis. As the telescopic shaft 22 rotates the rotary valve rotor 3 to increase the amount of mud passing between the rotary valve rotor 3 and the rotary valve stator 4, the telescopic shaft 22 moves the rotary valve away from the mud conveying direction under the threaded engagement with the internal threaded sleeve 52. As the telescopic shaft 22 rotates with the rotary valve rotor 3 to reduce the amount of mud passing between the rotary valve rotor 3 and the rotary valve stator 4, the telescopic shaft 22 moves with the rotary valve in the direction of mud conveying under the threaded engagement with the internal threaded sleeve 52.

[0053] The pressure balancing component of the continuous wave mud pulse generator is configured by the fixed rotating shaft 21, the telescopic shaft 22, the transmission key shaft 23, and the internal threaded sleeve 52. During the process of mud flow change between the rotary valve rotor 3 and the rotary valve stator 4, the threaded engagement of the telescopic shaft 22 and the internal threaded sleeve 52 causes the rotary valve to move adaptively along its rotation axis, so as to dynamically balance the pressure at the rotary valve.

[0054] The telescopic shaft 22 has a short thread at the end away from the transmission key shaft 23, and the inner side of the internal thread sleeve 52 has a long thread, so that the short thread on the telescopic shaft 22 is always located inside the internal thread sleeve 52 during the movement of the telescopic shaft 22 along its length, thus preventing mud from entering the thread gap.

[0055] The telescopic shaft 22 and the internal threaded sleeve 52 are connected by a common thread. The drive motor drives the fixed rotating shaft 21 to rotate alternately in both directions, so that the telescopic shaft 22 moves back and forth along its length. Figure 8 and Figure 9 As shown.

[0056] The telescopic shaft 22 has a first vent 2202 along its length, which connects the internal threaded sleeve 52 and the limiting slide groove 2201. Figure 8 and Figure 9 As shown, during the movement of the telescopic shaft 22 along its axial direction in the internal threaded sleeve 52, the air between the telescopic shaft 22 and the internal threaded sleeve 52 reciprocates with the air in the limiting groove 2201, and the air pressure remains constant.

[0057] The inner wall of the mounting sleeve 1, as well as the surfaces of the transmission key shaft 23 and the L-shaped limit rod 61, are coated with a wear-resistant non-stick coating. The wear-resistant non-stick coating can be made of conventional wear-resistant non-stick materials in the existing technology.

[0058] Working principle: When the drive motor drives the fixed rotating shaft 21 to rotate through the transmission key shaft 23 and the telescopic shaft 22 to rotate, the telescopic shaft 22 rotates the rotary valve rotor 3. At the same time, the telescopic shaft 22 moves along its own length direction under the threaded engagement with the internal threaded sleeve 52, thereby moving the rotary valve along its rotation axis. Among them, such as Figure 6As shown, during the process of the telescopic shaft 22 rotating the rotary valve rotor 3 to increase the amount of mud passing between the rotary valve rotor 3 and the rotary valve stator 4, the telescopic shaft 22 moves the rotary valve away from the mud conveying direction under the threaded engagement with the internal threaded sleeve 52. Among them, such as Figure 7 As shown, during the process of the telescopic shaft 22 rotating the rotary valve rotor 3 to reduce the amount of mud passing between the rotary valve rotor 3 and the rotary valve stator 4, the telescopic shaft 22 moves the rotary valve in the direction of mud conveying under the threaded engagement with the internal threaded sleeve 52.

[0059] As another embodiment of this example, the telescopic shaft 22 and the internal threaded sleeve 52 are connected by a variable pitch screw thread. The drive motor drives the fixed rotating shaft 21 to rotate in one direction so that the telescopic shaft 22 moves back and forth along its length direction, avoiding the drive motor from switching the rotation direction, thereby reducing bearing wear and circuit interference during operation, and helping to extend the service life of the drive motor.

[0060] Compared to existing technologies, this solution, through the coordinated arrangement of the fixed rotating shaft 21, the telescopic shaft 22, the transmission key shaft 23, and the internal threaded sleeve 52, allows the rotary valve to adapt to changes in the amount of mud passing through the rotary valve rotor 3 and the rotary valve stator 4. This is achieved by utilizing the threaded engagement of the telescopic shaft 22 and the internal threaded sleeve 52 to dynamically balance the pressure at the rotary valve, thus making it more versatile.

[0061] In light of current practical needs, the above-described embodiments adopted in this application are not limited to this scope of protection. Various changes made within the knowledge of those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A pressure balancing component for a continuous wave mud pulse generator, characterized in that: The device includes an axially extendable drive shaft (2) and an auxiliary drive component (5). The auxiliary drive component (5) is fixed on the mounting sleeve (1) of the pulse generator and is coaxially arranged with the drive shaft (2). The rotary valve of the pulse generator is connected to the telescopic shaft (22) of the drive shaft (2). The telescopic shaft (22) of the drive shaft (2) passes through the rotary valve and is connected to the auxiliary drive component (5). The rotary valve rotor (3) is rotatably connected to the rotary valve stator (4). The rotary valve rotor (3) is connected to the drive shaft (5). The telescopic shaft (22) of the shaft (2) is fixedly connected, and the rotary valve stator (4) of the rotary valve is sleeved on the telescopic shaft (22) of the transmission shaft (2). When the transmission shaft (2) rotates, it drives the rotary valve rotor (3) to rotate relative to the rotary valve stator (4). At the same time, under the connection and cooperation of the telescopic shaft (22) of the transmission shaft (2) and the auxiliary transmission component (5), the telescopic shaft (22) of the transmission shaft (2) drives the rotary valve rotor (3) and the rotary valve stator (4) to move together along the axial direction of the mounting sleeve (1).

2. The pressure balancing component for a continuous wave mud pulse generator as described in claim 1, characterized in that: The rotary valve rotor (3) is located on the side of the rotary valve stator (4) facing the mud output, and the auxiliary transmission component (5) is located on the side of the rotary valve rotor (3) away from the rotary valve stator (4).

3. The pressure balancing component for a continuous wave mud pulse generator as described in claim 2, characterized in that: During the process where the transmission shaft (2) drives the rotary valve rotor (3) to rotate so that the amount of mud passing between the rotary valve rotor (3) and the rotary valve stator (4) increases, the telescopic shaft (22), in cooperation with the auxiliary transmission component (5), moves the rotary valve toward the direction away from the mud conveying; during the process where the transmission shaft (2) drives the rotary valve rotor (3) to rotate so that the amount of mud passing between the rotary valve rotor (3) and the rotary valve stator (4) increases, the telescopic shaft (22), in cooperation with the auxiliary transmission component (5), moves the rotary valve toward the direction of mud conveying.

4. A pressure balancing component for a continuous wave mud pulse generator as described in any one of claims 1-3, characterized in that: The transmission shaft component (2) includes a fixed rotating shaft (21), a transmission key shaft (23), and a telescopic shaft (22). The fixed rotating shaft (21) is coaxially connected to the telescopic shaft (22) through the transmission key shaft (23). The transmission key shaft (23) transmits the torque of the fixed rotating shaft (21) to the telescopic shaft (22), and causes the telescopic shaft (22) to move axially relative to the fixed rotating shaft (21) with the cooperation of the auxiliary transmission component (5) when it rotates.

5. A pressure balancing component for a continuous wave mud pulse generator as described in claim 4, characterized in that: One end of the transmission key shaft (23) is fixedly connected to the fixed rotating shaft (21), and the telescopic shaft (22) is provided with a limiting groove (2201) for the transmission key shaft (23) to be inserted.

6. A pressure balancing component for a continuous wave mud pulse generator as described in any one of claims 1-3, characterized in that: The auxiliary transmission component (5) includes a support frame (51) and an internal threaded sleeve (52), wherein the internal threaded sleeve (52) is fixed inside the mounting sleeve (1) by the support frame (51).

7. A pressure balancing component for a continuous wave mud pulse generator as described in claim 6, characterized in that: The telescopic shaft (22) of the transmission shaft (2) is inserted into the internal threaded sleeve (52) and threadedly engaged with the internal threaded sleeve (52). When the transmission shaft (2) reciprocates, under the threaded engagement of the telescopic shaft (22) and the auxiliary transmission component (5), the telescopic shaft (22) drives the rotary valve stator (4) and the rotary valve rotor (3) to reciprocate along the axial direction of the mounting sleeve (1).

8. A pressure balancing component for a continuous wave mud pulse generator as described in claim 7, characterized in that: The upper end of the internal threaded sleeve (52) is closed, and a first vent hole (2202) is provided inside the telescopic shaft (22). The first vent hole (2202) connects the cavity formed between the telescopic shaft (22) and the internal threaded sleeve (52) with the limiting groove (2201) inside the telescopic shaft (22).

9. A pressure balancing component for a continuous wave mud pulse generator as described in claim 6, characterized in that: The telescopic shaft (22) of the transmission shaft (2) and the internal threaded sleeve (52) form a variable pitch screw assembly. When the transmission shaft rotates continuously in one direction, under the cooperation of the variable pitch screw assembly formed by the telescopic shaft (22) and the internal threaded sleeve (52), the telescopic shaft (22) drives the rotary valve stator (4) and the rotary valve rotor (3) to reciprocate along the axial direction of the mounting sleeve (1).

10. A pressure balancing component for a continuous wave mud pulse generator as described in any one of claims 1-3, characterized in that: A limiting component (6) for limiting the rotation of the rotary valve stator (4) is provided between the rotary valve stator (4) and the mounting sleeve (1).

11. A pressure balancing component for a continuous wave mud pulse generator as described in claim 10, characterized in that: The limiting component (6) is a telescopic limiting component (6). One end of the limiting component (6) is fixedly mounted on the inner wall of the mounting sleeve (1), and the other end is fixedly connected to the rotary valve stator (4). The end of the limiting component (6) that is fixedly connected to the rotary valve stator (4) can be axially extended and retracted relative to the end that is fixedly connected to the mounting sleeve (1).

12. A pressure balancing component for a continuous wave mud pulse generator as described in claim 10, characterized in that: The limiting assembly (6) includes an L-shaped limiting rod (61) and a limiting sleeve (62). The L-shaped limiting rod (61) is fixed to the inner wall of the mounting sleeve (1), and the limiting sleeve (62) is fixed to the side end of the rotary valve stator (4) and sleeved on the outside of the L-shaped limiting rod (61).

13. A pressure balancing component for a continuous wave mud pulse generator as described in claim 12, characterized in that: The limiting sleeve (62) is sealed, and the end of the L-shaped limiting rod (61) that extends into the limiting sleeve (62) is fixed with a limiting slider (63). The limiting slider (63) is slidably assembled in the limiting sleeve (62). The limiting slider (63) divides the sealed cavity of the limiting sleeve (62) into two chambers, left and right.

14. A pressure balancing component for a continuous wave mud pulse generator as described in claim 13, characterized in that: The limiting slider (63) is provided with a second vent (6301), which connects the left and right chambers separated by the limiting slider (63).

15. A pressure balancing component for a continuous wave mud pulse generator as described in claim 12, characterized in that: The inner wall of the mounting sleeve (1), the transmission key shaft (23), and the surface of the L-shaped limiting rod (61) are all coated with a wear-resistant non-stick coating.

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