Rotary valve pulse generator

Abstract

The application provides a rotary valve pulse generating device, which comprises a driving module and a transmission module connected with the driving module, wherein the transmission module comprises a magnetic gear reducer, the magnetic gear reducer comprises an input shaft, a rotating permanent magnet unit sleeved on the input shaft, a transmission permanent magnet unit sleeved on the outer periphery of the rotating permanent magnet unit, a transmission magnet adjusting unit sleeved on the outer periphery of the transmission permanent magnet unit and a fixed permanent magnet unit sleeved on the outer periphery of the transmission magnet adjusting unit, the driving module can drive the input shaft to rotate, the input shaft further drives the rotating permanent magnet unit to rotate, the rotating permanent magnet unit drives the transmission permanent magnet unit to rotate through magnetic force, the fixed permanent magnet unit is fixed, and the transmission magnet adjusting unit rotates under the magnetic force jointly applied by the transmission permanent magnet unit and the fixed permanent magnet unit. The torque transmission inside the magnetic gear reducer is more stable, and the service life of the rotary valve pulse generating device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of while-drilling measurement and control, in particular to a rotary valve pulse generator. BACKGROUND

[0002] The rotary valve pulse generator generates pulse signals through reciprocating rotation of a rotor, and can be used in mud with different specific gravities and different downhole conditions, is suitable for a wide range of mud specific gravities and working conditions, and has good adaptability to drilling fluid systems and downhole conditions. Therefore, the use scale of the rotary valve pulse generator is gradually increasing.

[0003] Due to the strong demand for quality improvement, speed improvement, efficiency improvement and yield improvement in drilling construction, the rotary valve pulse generator is correspondingly configured with high displacement, high pump pressure and high rotation speed, which causes serious mechanical wear between the mechanical transmission gears of the mechanical interlocking gear reducer of the traditional rotary valve pulse generator, and further causes the stability of the rotary valve pulse generator in the construction environment to be seriously reduced, and faults such as the gear reducer being broken are prone to occur, thereby reducing the reliability of the rotary valve pulse generator. SUMMARY

[0004] An object of the present application is to provide a rotary valve pulse generator, so that there is no mechanical wear between the rotating permanent magnet unit and the transmission permanent magnet unit, and between the transmission magnetic adjustment unit and the transmission permanent magnet unit and the fixed permanent magnet unit, so that the torque transmission inside the magnetic gear reducer is more stable, the safety of the magnetic gear reducer is effectively guaranteed, the magnetic gear reducer is prevented from being broken, and the service life of the rotary valve pulse generator is improved.

[0005] According to the present application, a rotary valve pulse generator is provided, which comprises a driving module and a transmission module connected with the driving module, the transmission module comprising a magnetic gear reducer, the magnetic gear reducer comprising an input shaft, a rotating permanent magnet unit sleeved on the input shaft, a transmission permanent magnet unit sleeved on the outer periphery of the rotating permanent magnet unit, a transmission magnetic adjustment unit sleeved on the outer periphery of the transmission permanent magnet unit, and a fixed permanent magnet unit sleeved on the outer periphery of the transmission magnetic adjustment unit, the driving module being capable of driving the input shaft to rotate, the input shaft in turn driving the rotating permanent magnet unit to rotate, the rotating permanent magnet unit driving the transmission permanent magnet unit to rotate through magnetic force, the fixed permanent magnet unit being stationary, and the transmission magnetic adjustment unit rotating under the combined magnetic force of the transmission permanent magnet unit and the fixed permanent magnet unit.

[0006] In a preferred embodiment, the rotating permanent magnet unit comprises an inner rotor yoke sleeved on the input shaft and an inner permanent magnet ring sleeved on the outer periphery of the inner rotor yoke.

[0007] In a preferred embodiment, the transmission permanent magnet unit comprises the intermediate inner permanent magnet ring sleeved on the outer periphery of the inner permanent magnet ring, the intermediate rotor yoke sleeved on the outer periphery of the intermediate inner permanent magnet ring, and the intermediate outer permanent magnet ring sleeved on the outer periphery of the intermediate rotor yoke.

[0008] In a preferred embodiment, the magnetic gear reducer further comprises a first end cover, a housing, and a second end cover, two ends of the housing are connected with the first end cover and the second end cover respectively to form a containing space, the rotating permanent magnet unit, the transmission permanent magnet unit, the transmission magnet adjusting unit, the fixed permanent magnet unit, and part of the input shaft are located in the containing space, and the fixed permanent magnet unit is fixedly connected with the housing.

[0009] In a preferred embodiment, the magnetic gear reducer further comprises an inner magnet adjusting unit arranged between the intermediate inner permanent magnet ring and the inner permanent magnet ring, the inner magnet adjusting unit comprises a first tray framework sleeved on the outer periphery of the inner permanent magnet ring and a plurality of first magnet conducting blocks arranged along the outer periphery of the first tray framework, and the magnetism of the first magnet conducting blocks is alternately distributed.

[0010] In a preferred embodiment, the transmission magnet adjusting unit comprises a second tray framework sleeved on the outer periphery of the intermediate outer permanent magnet ring and a plurality of second magnet conducting blocks arranged along the outer periphery of the second tray framework, and the magnetism of the second magnet conducting blocks is alternately distributed.

[0011] In a preferred embodiment, the transmission module further comprises a magnetic coupling connected with the magnetic gear reducer and a transmission main shaft connected with the magnetic coupling, the magnetic coupling comprises an outer magnetic disc and an inner magnetic ring, the outer magnetic disc is connected with the second tray framework through a connecting rod, the connecting rod drives the outer magnetic disc to rotate together with the transmission magnet adjusting unit, the outer magnetic disc and the inner magnetic ring can realize non-contact transmission through magnetic force, and the inner magnetic ring is connected with the transmission main shaft to drive the transmission main shaft to rotate.

[0012] In a preferred embodiment, the transmission main shaft comprises a transmission input shaft, an elastic torque limiter, and a transmission output shaft, the transmission input shaft is connected with the transmission output shaft through the elastic torque limiter, and the transmission input shaft is connected with the inner magnetic ring.

[0013] In a preferred embodiment, the elastic torque limiter comprises a cam body, a groove seat matched with the cam body, and a transmission base, the cam body is connected with the transmission input shaft, the transmission base is connected with the transmission output shaft, the cam body and the groove seat are arranged inside the transmission base, the cam body has a plurality of arc-shaped cams circumferentially, and a flat groove is arranged between adjacent arc-shaped cams, the groove seat has a plurality of arc-shaped grooves circumferentially, and a flat tooth is arranged between adjacent arc-shaped grooves, the arc-shaped cam is arranged in the arc-shaped groove, and the flat tooth is arranged in the flat groove.

[0014] In a preferred embodiment, the elastic torque limiter further comprises a transmission rod and an elastic member arranged inside the transmission base, the inside of the transmission base has a transmission groove and a stepped surface, a first end of the transmission rod is fixed on an end surface of the groove seat away from the cam body, a second end of the transmission rod is arranged in the transmission groove, the end surface of the groove seat away from the cam body, the transmission base, and the transmission rod form a containing space, the elastic member is arranged in the containing space, a first end of the elastic member is connected with the end surface of the groove seat away from the cam body, and a second end of the elastic member is connected with the stepped surface.

[0015] In a preferred embodiment, it further comprises a pulse generation module, which comprises a stator, a rotor, and an auxiliary spring assembly, the transmission output shaft is connected with the rotor to drive the rotor to rotate, the rotor is connected with the auxiliary spring assembly through a crank linkage mechanism, and the rotor is matched with the stator to generate a pulse.

[0016] In a preferred embodiment, the auxiliary spring assembly comprises a piston cylinder, a bottom elastic member, a top elastic member, and a piston, the bottom elastic member, the top elastic member, and the piston are arranged in the piston cylinder, the piston is connected with the crank linkage mechanism, the crank linkage mechanism can drive the piston to move in the piston cylinder, and the bottom elastic member and the top elastic member are respectively arranged between the piston and the piston cylinder in the movement direction of the piston.

[0017] The application comprises a magnetic gear reducer, a driving module, the magnetic gear reducer comprises an input shaft, a rotating permanent magnet unit sleeved on the input shaft, a transmission permanent magnet unit sleeved on the outer periphery of the rotating permanent magnet unit, a transmission magnetic modulation unit sleeved on the outer periphery of the transmission permanent magnet unit, and a fixed permanent magnet unit sleeved on the outer periphery of the transmission magnetic modulation unit, the driving module can drive the input shaft to rotate, the input shaft further drives the rotating permanent magnet unit to rotate, the rotating permanent magnet unit drives the transmission permanent magnet unit to rotate through magnetic force, and the fixed permanent magnet unit is fixed, the transmission magnetic modulation unit rotates under the magnetic force applied by the transmission permanent magnet unit and the fixed permanent magnet unit, the rotating permanent magnet unit drives the transmission permanent magnet unit through magnetic force, and the transmission magnetic modulation unit rotates under the magnetic force applied by the transmission permanent magnet unit and the fixed permanent magnet unit, physical contact is not needed between the rotating permanent magnet unit and the transmission permanent magnet unit, and physical contact is also not needed between the transmission magnetic modulation unit and the transmission permanent magnet unit and the fixed permanent magnet unit, therefore, mechanical wear is not caused between the rotating permanent magnet unit and the transmission permanent magnet unit, between the transmission magnetic modulation unit and the transmission permanent magnet unit, and between the transmission magnetic modulation unit and the fixed permanent magnet unit, the torque transmission inside the magnetic gear reducer is more stable, the safety of the magnetic gear reducer is effectively ensured, the magnetic gear reducer is prevented from being broken, and the service life of the rotary valve pulse generating device is prolonged.

[0018] The elastic torque limiter further comprises a transmission rod and an elastic member arranged in the transmission base, the transmission base has a transmission groove and a stepped surface in the interior, the first end of the transmission rod is fixed on the end face of the groove seat away from the cam body, the second end of the transmission rod is arranged in the transmission groove, the end face of the groove seat away from the cam body, the transmission base and the transmission rod enclose a containing space, and the elastic member is arranged in the containing space and connected with the end face of the groove seat away from the cam body at the first end and connected with the stepped surface at the second end, when the torque transmitted by the input shaft exceeds the set value, the cam body can exert a compression direction force on the spring through the groove seat, so that the elastic member is compressed and the groove seat moves in the compression direction of the elastic member, thereby transferring the fatigue damage of the transmission main shaft caused by the torque exceeding the set value to the elastic torque limiter, the fatigue accumulation of the input shaft and the output shaft is reduced, and the service life and reliability of the input shaft and the output shaft are improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The overall structure of the rotary valve pulse generating device according to the application is schematically shown;

[0020] Figure 2 The structure of the transmission module according to the application is schematically shown;

[0021] Figure 3 It is the axial cross-sectional structure of the magnetic gear reducer of the application;

[0022] Figure 4It is the vertical axial section structure schematic diagram of the magnetic gear reducer of the present application;

[0023] Figure 5 It is the outer magnetic disk axial section structure schematic diagram of the magnetic coupling of the present application;

[0024] Figure 6 It is the outer magnetic disk end surface structure schematic diagram of the magnetic coupling of the present application;

[0025] Figure 7 It is the inner magnetic ring axial section structure schematic diagram of the magnetic coupling of the present application;

[0026] Figure 8 It is the permanent magnet structure schematic diagram of the outer magnetic disk of the magnetic coupling of the present application;

[0027] Figure 9 It is the permanent magnet structure schematic diagram of the inner magnetic ring of the magnetic coupling of the present application;

[0028] Figure 10 It is the axial section structure schematic diagram of the elastic torque limiter in normal state of the present application;

[0029] Figure 11 It is the axial section structure schematic diagram of the elastic torque limiter in failure state of the present application;

[0030] Figure 12 It is the cam body and groove seat matching structure schematic diagram of the elastic torque limiter of the present application;

[0031] Figure 13 It is the groove seat end surface structure schematic diagram of the elastic torque limiter of the present application;

[0032] Figure 14 It is the transmission base end surface structure schematic diagram of the elastic torque limiter of the present application;

[0033] Figure 15 It is the matching end surface structure schematic diagram of the cam body of the elastic torque limiter of the present application;

[0034] Figure 16 It is the groove seat matching end surface structure schematic diagram of the elastic torque limiter of the present application;

[0035] Figure 17 It is the structure schematic diagram of the pulse generation module of the present application;

[0036] Figure 18 It is the structure schematic diagram of the auxiliary spring assembly in the initial state of the rotor of the present application;

[0037] Figure 19 It is the structure schematic diagram of the auxiliary spring assembly in the closed state of the rotor of the present application.

[0038] In the present application, all the drawings are schematic drawings for illustrating the principles of the present application only and are not drawn to scale. DETAILED DESCRIPTION

[0039] For the purpose of making the principles, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other in any manner without conflict.

[0040] As shown in Figures 1 to 4 The rotating valve pulse generating device 100 described in the present application comprises a driving module 1, a transmission module 2 connected with the driving module 1, and a pulse generating module 3 connected with the transmission module 2, the driving module 1 is used to drive the transmission module 2 to move, and the transmission module 2 is used to drive the pulse generating module 3 to move to generate pressure pulses.

[0041] The transmission module 2 comprises a magnetic gear reducer 8, which is used to reduce the rotating speed and thus increase the torque. The magnetic gear reducer 8 comprises an input shaft 13, a rotating permanent magnet unit 24 sleeved on the input shaft 13, a transmission permanent magnet unit 25 sleeved on the outer periphery of the rotating permanent magnet unit 24, a transmission magnetic modulation unit 20 sleeved on the outer periphery of the transmission permanent magnet unit 25, and a fixed permanent magnet unit 21 sleeved on the outer periphery of the transmission magnetic modulation unit 20, wherein the rotating permanent magnet unit 24, the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21 can all exert magnetic force, and the transmission magnetic modulation unit 20 located between the fixed permanent magnet unit 21 and the transmission permanent magnet unit 25 is used to modulate the transmission permanent magnet unit 25 to transmit torque in the rotating direction according to a set transmission ratio.

[0042] The driving module 1 can drive the input shaft 13 to rotate, the input shaft 13 in turn drives the rotating permanent magnet unit 24 to rotate, the rotating permanent magnet unit 24 drives the transmission permanent magnet unit 25 to rotate through the magnetic force, the fixed permanent magnet unit 21 is fixed, and the transmission magnetic modulation unit 20 rotates under the magnetic force exerted by the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21.

[0043] The application can drive the input shaft 13 to rotate, the input shaft 13 further drives the rotating permanent magnet unit 24 to rotate, and the rotating permanent magnet unit 24 drives the transmission permanent magnet unit 25 to rotate through magnetic force, and the fixed permanent magnet unit 21 is fixed, the transmission magnetic modulation unit 20 rotates under the magnetic force applied by the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21, and the rotating permanent magnet unit 24 drives the transmission permanent magnet unit 25 through magnetic force, and the transmission magnetic modulation unit 20 rotates under the magnetic force applied by the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21, so that the rotating permanent magnet unit 24 and the transmission permanent magnet unit 25 do not need physical contact, and the transmission magnetic modulation unit 20, the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21 also do not need physical contact, so that the rotating permanent magnet unit 24 and the transmission permanent magnet unit 25, the transmission magnetic modulation unit 20, the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21 are all free from mechanical wear, so that the torque transmission inside the magnetic gear reducer 8 is more stable, the safety of the magnetic gear reducer 8 is effectively guaranteed, the magnetic gear reducer 8 is prevented from being broken, and the service life of the rotary valve pulse generating device 100 is improved.

[0044] In addition, the rotating permanent magnet unit 24 drives the transmission permanent magnet unit 25 through magnetic force, so as to realize first-stage torque transmission, and the transmission magnetic modulation unit 20 rotates under the magnetic force applied by the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21, so as to realize second-stage torque transmission, and the application can further increase the torque output by the magnetic gear reducer 8 through two-stage torque transmission.

[0045] In one or more embodiments, the rotating permanent magnet unit 24 comprises an inner rotor yoke 14 sleeved on the input shaft 13 and an inner permanent magnet ring 15 sleeved on the outer periphery of the inner rotor yoke 14. The inner permanent magnet ring 15 is composed of a pair of "N / S" first permanent magnets 27, and the polarities of adjacent first permanent magnets 27 are opposite, and the first permanent magnets 27 are arranged in an "N / S" alternating array. The inner rotor yoke 14 is made of a ferromagnetic material and is used to increase the magnetism of the inner permanent magnet ring 15. Optionally, the inner rotor yoke 14 is configured in a ring shape.

[0046] In one or more embodiments, the transmission permanent magnet unit 25 comprises a middle inner permanent magnet ring 17 sleeved on the outer periphery of the inner permanent magnet ring 15, a middle rotor yoke 18 sleeved on the outer periphery of the middle inner permanent magnet ring 17, and a middle outer permanent magnet ring 19 sleeved on the outer periphery of the middle rotor yoke 18. The middle inner permanent magnet ring 17 is composed of pairs of “N / S” second permanent magnets 28, and adjacent second permanent magnets 28 have opposite polarities, the second permanent magnets 28 are arranged in an “N / S” alternating array, and the number of pole pairs of the second permanent magnets 28 of the middle inner permanent magnet ring 17 is greater than the number of pole pairs of the first permanent magnets 27 of the inner permanent magnet ring 15. The middle outer permanent magnet ring 19 is composed of pairs of “N / S” third permanent magnets 29, and adjacent third permanent magnets 29 have opposite polarities, the third permanent magnets 29 are arranged in an “N / S” alternating array. The middle outer permanent magnet ring 19 rotates integrally with the middle inner permanent magnet ring 17, and the angular velocities of the two are the same. The middle rotor yoke 18 is made of ferromagnetic material and is used to increase the magnetism of the middle inner permanent magnet ring 17. Optionally, the middle rotor yoke 18 is configured in a ring shape.

[0047] In one or more embodiments, the magnetic gear reducer 8 further comprises a first end cover 12, a housing 22, and a second end cover 23, the two ends of the housing 22 are connected with the first end cover 12 and the second end cover 23 respectively to form a containing space, the rotating permanent magnet unit 24, the transmission permanent magnet unit 25, the transmission magnetism adjusting unit 20, the fixed permanent magnet unit 21, and part of the input shaft 13 are located in the containing space, and the fixed permanent magnet unit 21 is fixedly connected with the housing 22.

[0048] The fixed permanent magnet unit 21 comprises an outer permanent magnet ring composed of pairs of “N / S” fourth permanent magnets 30, and adjacent fourth permanent magnets 30 have opposite polarities, the fourth permanent magnets 30 are arranged in an “N / S” alternating array, and the number of pole pairs of the fourth permanent magnets 30 of the outer permanent magnet ring is greater than the number of pole pairs of the third permanent magnets 29 of the middle outer permanent magnet ring 19.

[0049] In one or more embodiments, the magnetic gear reducer 8 further comprises an inner magnetism adjusting unit 16 arranged between the middle inner permanent magnet ring 17 and the inner permanent magnet ring 15, which is used to modulate the torque transmission of the middle inner permanent magnet ring 17 in the rotating direction according to a set transmission ratio, so as to improve the transmission efficiency of the middle inner permanent magnet ring 17. The inner magnetism adjusting unit 16 comprises a first tray skeleton 32 sleeved on the outer periphery of the inner permanent magnet ring 17 and a plurality of first magnetic flux guide blocks 31 arranged along the outer periphery of the first tray skeleton 32, the magnetic properties of the first magnetic flux guide blocks 31 are alternately distributed, the first tray skeleton 32 is made of non-magnetic material, the inner magnetism adjusting unit 16 is configured in a ring shape, and the inner magnetism adjusting unit 16 is fixedly installed and cannot rotate, so as to enable the middle inner permanent magnet ring 17 to rotate through magnetic force.

[0050] In one or more embodiments, the transmission and magnetic adjusting unit 20 comprises a second tray skeleton 34 sleeved on the outer periphery of the intermediate outer permanent magnet ring 19 and a plurality of second magnetic conductive blocks 33 spaced along the outer periphery of the second tray skeleton 34, the magnetism of the second magnetic conductive blocks 33 being alternately distributed. The second tray skeleton 34 is made of a non-magnetic material. The present application facilitates the output of torque to the outside by the rotation of the second tray skeleton 34 under the magnetic force applied by the transmission permanent magnet unit 25 and the fixed permanent magnet unit 21.

[0051] As shown in Figures 5 to 9 one or more embodiments, the transmission module 2 further comprises a magnetic coupling 9 connected with the magnetic gear reducer 8 and a transmission main shaft 11 connected with the magnetic coupling 9. The magnetic coupling 9 comprises an outer magnetic disc 35 and an inner magnetic ring 36. The outer magnetic disc 35 is connected with the second tray skeleton 34 through connecting rods 37 which are spaced along the outer periphery of the outer magnetic disc 35 and are optionally perpendicular to the surface of the outer magnetic disc 35. The connecting rods 37 drive the outer magnetic disc 35 to rotate together with the transmission and magnetic adjusting unit 20. The outer magnetic disc 35 and the inner magnetic ring 36 can realize non-contact transmission through magnetic force. The inner magnetic ring 36 is connected with the transmission main shaft 11 to drive the transmission main shaft 11 to rotate. The inner magnetic ring 36 is encapsulated in a lubricating oil cavity 38. The outer magnetic disc 35 and the inner magnetic ring 36 are coaxially arranged and can drive the inner magnetic ring 36 to rotate at the same speed. Both the outer magnetic disc 35 and the inner magnetic ring 36 adopt a disc structure, which facilitates axial installation.

[0052] As shown in Figures 10 to 16 one or more embodiments, the transmission main shaft 11 comprises a transmission input shaft 41, an elastic torque limiter 10 and a transmission output shaft 42. The transmission input shaft 41 is connected with the transmission output shaft 42 through the elastic torque limiter 10. The transmission input shaft 41 is connected with the inner magnetic ring 36.

[0053] In one or more embodiments, the elastic torque limiter 10 comprises a cam body 43, a groove seat 44 matched with the cam body 43 and a transmission base 47. The cam body 43 is connected with the transmission input shaft 41. The transmission base 47 is connected with the transmission output shaft 42. The cam body 43 and the groove seat 44 are arranged inside the transmission base 47. The cam body 43 has a plurality of arc-shaped cams 48 along its circumferential direction. Plane grooves 49 are arranged between adjacent arc-shaped cams 48. The groove seat 44 has a plurality of arc-shaped grooves 50 along its circumferential direction. Plane teeth 51 are arranged between adjacent arc-shaped grooves 50. The arc-shaped cams 48 are arranged in the arc-shaped grooves 50. The plane teeth 51 are arranged in the plane grooves 49. The contact surfaces of the arc-shaped cams 48 and the arc-shaped grooves 50 can realize the transmission of bidirectional reciprocating rotation. The transmission input shaft 41 can realize the transmission of torque in forward rotation or reverse rotation.

[0054] The elastic torque limiter 10 also includes a transmission rod 45 and an elastic member 46 disposed within a transmission base 47. The transmission base 47 has a transmission groove 52 therein. The first end of the transmission rod 45 is fixed to the end face of the groove seat 44 away from the cam body 43. The second end of the transmission rod 45 is disposed within the transmission groove 52. The transmission rod 45 has a hexagonal cross-section, thereby enabling smooth transmission of torque to the transmission base 47. The transmission base 47 has a stepped surface therein. The end face of the groove seat 44 away from the cam body 43, the transmission base 47, and the transmission rod 45 form an accommodating space. The elastic member 46 is disposed within the accommodating space. The first end of the elastic member 46 is connected to the end face of the groove seat 44 away from the cam body 43, and the second end of the elastic member 46 is connected to the stepped surface of the transmission base 47. The elastic member 46 may be a spring.

[0055] When the torque transmitted by the input shaft 41 exceeds the set value, the arc cam 48 can apply a compression force to the elastic member 46 through the arc groove 50, causing the elastic member 46 to compress and the groove seat 44 to move in the compression direction of the elastic member 46, thereby transferring the fatigue damage of the torque exceeding the set value on the transmission main shaft 11 to the elastic torque limiter 10, which can reduce the fatigue accumulation of the input shaft 41 and the output shaft 42 and improve the service life and reliability of the input shaft 41 and the output shaft 42. When the torque transmitted by the input shaft 41 greatly exceeds the set value, the cam body 43 can be disengaged from the groove seat 44, thereby making the torque transmission invalid, avoiding the torque exceeding the set value being directly applied to the transmission main shaft 11, causing the transmission main shaft 11 to be mechanically damaged.

[0056] like Figure 17 As shown, in one or more embodiments, the pulse generating module 3 includes a stator 53, a rotor 54, and an auxiliary spring assembly 55. The transmission output shaft 42 is connected to the rotor 54 to drive the rotor 54 to rotate. The rotor 54 is connected to the auxiliary spring assembly 55 via a crank-connecting rod mechanism 61. The rotor 54 cooperates with the stator 53 to generate pulses. The crank-connecting rod mechanism 61 includes a plurality of connecting rods with hinged ends and angled ends.

[0057] In one or more embodiments, the pulse generating module 3 further includes a valve body housing 56 .

[0058] like Figures 18 to 19As shown in the drawings, in one or more embodiments, the auxiliary spring assembly 55 comprises a piston cylinder 57, a bottom elastic member 58, a top elastic member 59 and a piston 60, the bottom elastic member 58, the top elastic member 59 and the piston 60 are all arranged in the piston cylinder 57, the piston 60 is connected with a crank linkage mechanism 61, the crank linkage mechanism 61 can drive the piston 60 to move in the piston cylinder 57, in the moving direction of the piston 60, the bottom elastic member 58 and the top elastic member 59 are arranged between the piston 60 and the piston cylinder 57 respectively, and the piston 60 can compress the bottom elastic member 58 or the top elastic member 59 during the movement in the piston cylinder 57. The bottom elastic member 58 and the top elastic member 59 can both be springs.

[0059] As shown in the drawings, in one or more embodiments, the auxiliary spring assembly 55 comprises a piston cylinder 57, a bottom elastic member 58, a top elastic member 59 and a piston 60, the bottom elastic member 58, the top elastic member 59 and the piston 60 are all arranged in the piston cylinder 57, the piston 60 is connected with a crank linkage mechanism 61, the crank linkage mechanism 61 can drive the piston 60 to move in the piston cylinder 57, in the moving direction of the piston 60, the bottom elastic member 58 and the top elastic member 59 are arranged between the piston 60 and the piston cylinder 57 respectively, and the piston 60 can compress the bottom elastic member 58 or the top elastic member 59 during the movement in the piston cylinder 57. The bottom elastic member 58 and the top elastic member 59 can both be springs. Figure 18 As shown in the drawings, in one or more embodiments, the auxiliary spring assembly 55 comprises a piston cylinder 57, a bottom elastic member 58, a top elastic member 59 and a piston 60, the bottom elastic member 58, the top elastic member 59 and the piston 60 are all arranged in the piston cylinder 57, the piston 60 is connected with a crank linkage mechanism 61, the crank linkage mechanism 61 can drive the piston 60 to move in the piston cylinder 57, in the moving direction of the piston 60, the bottom elastic member 58 and the top elastic member 59 are arranged between the piston 60 and the piston cylinder 57 respectively, and the piston 60 can compress the bottom elastic member 58 or the top elastic member 59 during the movement in the piston cylinder 57. The bottom elastic member 58 and the top elastic member 59 can both be springs.

[0060] As shown in the drawings, in one or more embodiments, the auxiliary spring assembly 55 comprises a piston cylinder 57, a bottom elastic member 58, a top elastic member 59 and a piston 60, the bottom elastic member 58, the top elastic member 59 and the piston 60 are all arranged in the piston cylinder 57, the piston 60 is connected with a crank linkage mechanism 61, the crank linkage mechanism 61 can drive the piston 60 to move in the piston cylinder 57, in the moving direction of the piston 60, the bottom elastic member 58 and the top elastic member 59 are arranged between the piston 60 and the piston cylinder 57 respectively, and the piston 60 can compress the bottom elastic member 58 or the top elastic member 59 during the movement in the piston cylinder 57. The bottom elastic member 58 and the top elastic member 59 can both be springs. Figure 1As shown, in one or more embodiments, the driving module 1 comprises a driving circuit 4 and a downhole servo motor 5, the driving circuit 4 is connected to an aviation plug 6 at the tail end in the short section installation mode, the aviation plug 6 is used for supplying power and transmitting driving signals for the driving module 1, and the output end of the downhole servo motor 5 is connected with the transmission unit 2 through an elastic coupling 7, so as to drive the transmission unit 2 to move.

[0061] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to the application without departing from the scope of the application, and equivalent parts can be substituted for the parts thereof. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A rotary valve pulse generating device comprising: The drive module and a transmission module connected with the drive module, The transmission module comprises a magnetic gear reducer, the magnetic gear reducer comprises an input shaft, a rotating permanent magnet unit sleeved on the input shaft, a transmission permanent magnet unit sleeved on the outer periphery of the rotating permanent magnet unit, a transmission magnet adjusting unit sleeved on the outer periphery of the transmission permanent magnet unit, and a fixed permanent magnet unit sleeved on the outer periphery of the transmission magnet adjusting unit, the drive module can drive the input shaft to rotate, the input shaft in turn drives the rotating permanent magnet unit to rotate, the rotating permanent magnet unit drives the transmission permanent magnet unit to rotate through magnetic force, the fixed permanent magnet unit is fixed, and the transmission magnet adjusting unit rotates under the magnetic force jointly applied by the transmission permanent magnet unit and the fixed permanent magnet unit; The transmission module further comprises a magnetic coupling connected with the magnetic gear reducer and a transmission main shaft connected with the magnetic coupling, the magnetic coupling comprises an outer magnetic disc and an inner magnetic ring, the outer magnetic disc is connected with the second tray skeleton of the transmission magnet adjusting unit through a connecting rod, the connecting rod drives the outer magnetic disc to rotate together with the transmission magnet adjusting unit, the outer magnetic disc and the inner magnetic ring can realize non-contact transmission through magnetic force, and the inner magnetic ring is connected with the transmission main shaft to drive the transmission main shaft to rotate. The transmission main shaft comprises a transmission input shaft, an elastic torque limiter and a transmission output shaft, the transmission input shaft is connected with the transmission output shaft through the elastic torque limiter, and the transmission input shaft is connected with the inner magnetic ring. The elastic torque limiter comprises a cam body, a groove seat matched with the cam body and a transmission base, the cam body is connected with the transmission input shaft, the transmission base is connected with the transmission output shaft, the cam body and the groove seat are arranged in the interior of the transmission base, the cam body has a plurality of arc cams in the circumferential direction, and a planar groove is arranged between adjacent arc cams, the groove seat has a plurality of arc grooves in the circumferential direction, and a planar tooth is arranged between adjacent arc grooves, the arc cam is arranged in the arc groove, and the planar tooth is arranged in the planar groove. The elastic torque limiter further comprises a transmission rod and an elastic member arranged in the interior of the transmission base, the interior of the transmission base has a transmission groove and a stepped surface, a first end of the transmission rod is fixed on an end face of the groove seat away from the cam body, a second end of the transmission rod is arranged in the transmission groove, the end face of the groove seat away from the cam body, the transmission base and the transmission rod surround a containing space, the elastic member is arranged in the containing space, a first end of the elastic member is connected with the end face of the groove seat away from the cam body, and a second end of the elastic member is connected with the stepped surface.

2. A rotary valve pulse generating device according to claim 1, characterised in that, The rotating permanent magnet unit comprises an inner rotor yoke sleeved on the input shaft and an inner permanent magnet ring sleeved on the outer periphery of the inner rotor yoke.

3. A rotary valve pulse generating device according to claim 2, wherein The transmission permanent magnet unit comprises an intermediate inner permanent magnet ring sleeved on the outer periphery of the inner permanent magnet ring, an intermediate rotor yoke sleeved on the outer periphery of the intermediate inner permanent magnet ring, and an intermediate outer permanent magnet ring sleeved on the outer periphery of the intermediate rotor yoke.

4. A rotary valve pulse generating device according to claim 3, wherein The magnetic gear reducer further comprises a first end cover, a casing and a second end cover, two ends of the casing are connected with the first end cover and the second end cover respectively to form a containing space, the rotating permanent magnet unit, the transmission permanent magnet unit, the transmission magnetic adjusting unit, the fixed permanent magnet unit and part of the input shaft are located in the containing space, and the fixed permanent magnet unit is fixedly connected with the casing.

5. The rotary valve pulse generating device of claim 3, wherein, The magnetic gear reducer further comprises an inner magnetic adjusting unit arranged between the intermediate inner permanent magnet ring and the inner permanent magnet ring, the inner magnetic adjusting unit comprises a first tray framework sleeved on the outer periphery of the inner permanent magnet ring and a plurality of first magnetic conducting blocks arranged along the outer periphery of the first tray framework, and the magnetic properties of the first magnetic conducting blocks are alternately distributed.

6. The rotary valve pulse generating device of claim 3, wherein, The transmission magnetic adjusting unit comprises a second tray framework sleeved on the outer periphery of the intermediate outer permanent magnet ring and a plurality of second magnetic conducting blocks arranged along the outer periphery of the second tray framework, and the magnetic properties of the second magnetic conducting blocks are alternately distributed.

7. The rotary valve pulse generator device of claim 1, wherein, The pulse generation module comprises a stator, a rotor and an auxiliary spring assembly, the transmission output shaft is connected with the rotor to drive the rotor to rotate, the rotor is connected with the auxiliary spring assembly through a crank connecting rod mechanism, and the rotor cooperates with the stator to generate a pulse.

8. A rotary valve pulse generating device according to claim 7, characterised in that, The auxiliary spring assembly comprises a piston cylinder, a bottom elastic element, a top elastic element and a piston, the bottom elastic element, the top elastic element and the piston are arranged in the piston cylinder, the piston is connected with the crank connecting rod mechanism, the crank connecting rod mechanism can drive the piston to move in the piston cylinder, and the bottom elastic element and the top elastic element are arranged between the piston and the piston cylinder in the movement direction of the piston respectively.

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