A positive displacement motor with a centralizer having a quick-change and three-way position adjustable function

Abstract

The present invention relates to the technical field of positive displacement motors, and specifically relates to a positive displacement motor with a centralizer having a quick-change and three-way position adjustable function, including an upper housing and a lower housing of a drive shaft connected up and down, and a drive shaft. An adjustment sleeve is sleeved and installed outside the upper housing of the drive shaft. A chute is arranged on the outer wall of the adjustment sleeve along the up and down direction. A centralizing strip is installed in the chute. The upper and lower ends of the centralizing strip are respectively provided with a first inclined surface and a second inclined surface. An upper thick pressure regulating block is adjustably installed on the upper side of the centralizing strip in the chute. The lower end of the upper thick pressure regulating block is provided with a third inclined surface that slidably fits with the first inclined surface. A lower thick pressure regulating block is adjustably installed on the lower side of the centralizing strip in the chute. The upper end of the lower thick pressure regulating block is provided with a fourth inclined surface that slidably fits with the second inclined surface; a radial adjusting piece is detachably arranged between the centralizing strip and the bottom of the chute. It solves the problem that the centralizing strip of the centralizer of the drive shaft assembly of the existing positive displacement motor cannot be quickly replaced after being worn.

Description

Technical Field

[0001] The present invention relates to the technical field of positive displacement motors, and particularly to a positive displacement motor with a centralizer having a quick replacement and three-way position adjustable function. Background Art

[0002] A positive displacement motor mainly consists of five parts: a drive shaft assembly, a universal shaft assembly, a bent housing assembly, a motor assembly, and a drop prevention assembly. The outer sleeve of the drive shaft assembly of the positive displacement motor is a centralizer, and the centralizer is made into different structures and sizes according to different wellbore sizes.

[0003] Centralizers are mainly divided into integral centralizers and replaceable centralizers. Among them, the replaceable centralizer is threadedly connected to the drive shaft assembly. The centralizing strips of the centralizer are the key parts of the centralizer, which have the functions of centralizing and wear resistance. The centralizing strips of the centralizer are classified according to different wear-resistant layers, and are mainly divided into three forms: wear-resistant surfacing layer, hard alloy wear-resistant blocks, and heat-stable polycrystalline wear-resistant blocks. Regardless of the wear-resistant form of the centralizing strips, uneven wear will occur in the three wear-resistant strips of the existing integral centralizer and replaceable centralizer during use. The uneven wear of the centralizer in the well will affect the build-up ability of the positive displacement motor. If the centralizer is worn out and fails, it needs to be replaced.

[0004] For the existing centralizer structures, whether it is an integral centralizer or a replaceable centralizer, once uneven wear occurs and fails, it can only be returned to the factory for disassembly, repair, and replacement.

[0005] The existing centralizers of the drive shaft assembly of positive displacement motors all have obvious deficiencies, which are mainly manifested as follows:

[0006] 1. The centralizing strips of the centralizer cannot be quickly replaced after wear;

[0007] 2. The outer diameter of the centralizing strips of the centralizer is not adjustable;

[0008] 3. The axial position of the centralizing strips of the centralizer is not adjustable;

[0009] 4. The circumferential direction of the eccentric centralizing strips of the centralizer is not adjustable;

[0010] 5. The processing, repair, disassembly, and assembly of the centralizer are difficult;

[0011] 6. The production, use, and repair costs of the centralizer are high. Summary of the Invention

[0012] The purpose of the present invention is to provide a positive displacement motor with a centralizer having a quick replacement and three-way position adjustable function, so as to solve the problem that the centralizing strips of the centralizer of the drive shaft assembly of the existing positive displacement motor cannot be quickly replaced after wear.

[0013] To solve the above technical problems, the present invention adopts the following technical solutions:

[0014] A screw drill with a centralizer with quick-change and three-way position adjustable functions, comprising an anti-drop assembly, a motor assembly, a bent housing assembly, a universal shaft assembly and a transmission shaft assembly arranged in sequence from top to bottom, the transmission shaft assembly comprising an upper transmission shaft housing and a lower transmission shaft housing connected up and down, and a transmission shaft rotatably arranged in the upper transmission shaft housing and the lower transmission shaft housing, an adjustment sleeve is installed on the outer sleeve of the upper transmission shaft housing, a slide groove is arranged on the outer wall of the adjustment sleeve along the up and down directions, a straightening bar is installed in the slide groove, the outer side of the straightening bar protrudes from the slide groove, and the straightening bar A first inclined surface and a second inclined surface are respectively provided at the upper and lower ends, the first inclined surface is inclined downward from the bottom of the slide groove to the groove mouth, and the second inclined surface is inclined upward from the bottom of the slide groove to the groove mouth. The slide groove is adjustably installed with an upper coarse adjustment pressure block on the upper side of the straightening bar, and the lower end of the upper coarse adjustment pressure block is set to a third inclined surface that slides with the first inclined surface. The slide groove is adjustably installed with a lower coarse adjustment pressure block on the lower side of the straightening bar, and the upper end of the lower coarse adjustment pressure block is set to a fourth inclined surface that slides with the second inclined surface; a radial adjustment sheet is detachably provided between the straightening bar and the groove bottom of the slide groove.

[0015] A further technical solution is that the upper groove wall and the lower groove wall of the slide groove are respectively connected with the upper end and the lower end of the adjusting sleeve, and the upper shell of the transmission shaft is provided with a locking nut on the upper side threaded sleeve of the adjusting sleeve, and the lower end of the locking nut is inclined downward from the inner wall to the outer wall to form a first conical surface, and the upper end of the upper coarse adjustment pressure block is set to be a second conical surface that slides in contact with the first conical surface, and a support ring is formed by the outer wall protrusion surrounding the lower end of the lower shell of the transmission shaft, and the lower end of the adjusting sleeve is in contact with the upper side of the support ring, and the upper side of the support ring is provided with a projection that extends into the slide groove at the position corresponding to the slide groove. A support block is provided on the support block, the upper end of the adjusting screw hole is connected with the upper side of the support block, and the lower end extends to be connected with the lower side of the support ring, the inner thread of the adjusting screw hole is matched and connected with a fine-tuning screw, and a fine-tuning pressure block is provided in the slide groove between the lower coarse adjustment pressure block and the support block, the lower side of the lower coarse adjustment pressure block is set as a fifth inclined surface parallel to the second inclined surface, the upper end of the fine-tuning pressure block is set as a sixth inclined surface slidingly fitted with the fifth inclined surface, and a support rod is provided on the lower side of the lower coarse adjustment pressure block, the support rod passes through the adjusting screw hole and is connected with the upper end of the fine-tuning screw.

[0016] A further technical solution is that the adjusting screw hole is thread-matchedly connected with a sealing screw below the fine-tuning screw.

[0017] A further technical solution is that the outer wall of the transmission shaft and the upper shell of the transmission shaft are rotatably connected via a composite sheet bearing.

[0018] A further technical solution is that the composite sheet bearing includes an inner bearing ring, an upper bearing outer ring and a lower bearing outer ring. The inner wall of the inner bearing ring is in contact with the outer wall of the transmission shaft. A sliding ring is formed to protrude outward from the middle of the outer wall of the inner bearing ring. The upper bearing outer ring is sleeved on the outer wall of the inner bearing ring above the sliding ring, and the lower side of the upper bearing outer ring is in sliding contact with the upper side of the sliding ring. The lower bearing outer ring is sleeved on the outer wall of the inner bearing ring below the sliding ring, and the upper side of the lower bearing outer ring is in sliding contact with the lower side of the sliding ring. The outer rings of the upper bearing outer ring and the lower bearing outer ring are both in contact with the inner wall of the upper housing of the transmission shaft.

[0019] A further technical solution is that a first ring groove is recessed on the upper side of the sliding ring, a second ring groove is recessed on the lower side, a third ring groove aligned with the first ring groove is recessed on the lower side of the upper bearing outer ring, and a fourth ring groove aligned with the second ring groove is recessed on the upper side of the lower bearing outer ring. An upper composite sheet group is filled between the first ring groove and the third ring groove, and a lower composite sheet group is filled between the second ring groove and the fourth ring groove.

[0020] A further technical solution is that a support portion protrudes inward above the upper bearing outer ring on the inner wall of the upper housing of the transmission shaft, and the lower side of the support portion is in top contact with the upper side of the upper bearing outer ring through an upper disc spring group; the upper end of the lower housing of the transmission shaft is connected with a support ring inside the upper housing of the transmission shaft, and the upper side of the support ring and the lower side of the lower bearing outer ring are in top contact through a lower disc spring group.

[0021] A further technical solution is that the upper housing of the transmission shaft and the transmission shaft are rotationally connected through an upper radial bearing static sleeve and an upper radial bearing dynamic sleeve above the composite sheet bearing. The outer wall of the upper radial bearing static sleeve is in contact with the inner wall of the upper housing of the transmission shaft, the upper radial bearing dynamic sleeve is in contact with the outer wall of the transmission shaft, and the outer wall of the upper radial bearing dynamic sleeve and the inner wall of the upper radial bearing static sleeve are in rotational contact; an installation ring groove is provided around the inner wall of the upper end of the upper housing of the transmission shaft, and a snap ring for hole is installed in the installation ring groove. The upper end of the upper radial bearing static sleeve is in top contact with the lower side of the snap ring for hole.

[0022] A further technical solution is that a lower radial bearing dynamic sleeve is sleeved on the outer wall near the lower end of the transmission shaft, and the inner wall of the lower end of the lower radial bearing dynamic sleeve is threadedly connected to the outer wall of the lower end of the transmission shaft; an anti-falling ring is installed at the position of the upper end of the lower radial bearing dynamic sleeve on the transmission shaft. The inner wall of the lower end of the anti-falling ring is fixed to the transmission shaft by means of threaded connection. The inner wall of the upper end of the lower radial bearing dynamic sleeve is connected to the outer wall of the lower end of the anti-falling ring through a clamping strip; the anti-falling ring protrudes outward above the lower radial bearing dynamic sleeve to form a first limiting ring, and the inner wall of the lower housing of the transmission shaft protrudes inward below the first limiting ring to form a second limiting ring that cooperates with the first limiting ring. The outer diameter of the first limiting ring is greater than the inner diameter of the second limiting ring

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When a certain centralizing strip is excessively worn during use and cannot work properly, a radial adjusting piece with a suitable thickness is added between the centralizing strip and the bottom of the sliding groove to increase the part of the centralizing strip protruding from the sliding groove, thereby making up for the worn part of the centralizing strip caused by use. After the adjustment is completed, the centralizing strip is fixed by the cooperation of the upper thick pressing block and the lower thick pressing block; 2. Through the cooperation of the first inclined surface and the third inclined surface, and the cooperation of the second inclined surface and the fourth inclined surface, after the upper thick pressing block and the lower thick pressing block are fixed, the up and down movement of the centralizing strip can be well restricted, thereby improving the firmness of the installation of the centralizing strip; 3. It improves the situation that the repair and replacement of the previous centralizing strip need to be sent back to the factory for repair. In the present invention, on the construction site, technicians can quickly complete the adjustment or replacement of the centralizing strip through the adjustment and regulation work of a small number of accessories, avoiding the construction period delay caused by repair; 4. The quick replacement function of the centralizing strip can extend the service life of the screw drill in the well; 5. The three-way position of the centralizing strip is adjustable, that is, the function of adjusting the up and down position and the radial position of the outer diameter of the centralizing strip through the upper thick pressing block and the lower thick pressing block can improve the build-up angle ability of the screw; 6. The production, repair, disassembly and assembly of the new centralizer structure become easy, and the management cost is reduced; 7. Solve the problem that the outer diameter of the centralizing strip in the prior art is not adjustable; 8. Solve the problem that the axial position of the centralizing strip in the prior art is not adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 FIG. is an overall schematic diagram of a screw drill with a centralizer having a quick replacement and three-way position adjustable function according to the present invention.

[0025] Figure 2 FIG. is a side schematic diagram of a drive shaft assembly of a screw drill with a centralizer having a quick replacement and three-way position adjustable function according to the present invention.

[0026] Figure 3 FIG. is a sectional schematic diagram of a drive shaft assembly of a screw drill with a centralizer having a quick replacement and three-way position adjustable function according to the present invention.

[0027] Figure 4 FIG. is a cross-sectional schematic diagram of a drive shaft assembly of a screw drill with a centralizer having a quick replacement and three-way position adjustable function according to the present invention.

[0028] Figure 5 is Figure 3 a partially enlarged schematic diagram at the marked position A in

[0029] Figure 6 is Figure 3 a partially enlarged schematic diagram at the marked position B in

[0030] Figure 7 is Figure 3 a partially enlarged schematic diagram at the marked position C in

[0031] Icons: 1 - anti - dropping assembly, 2 - motor assembly, 3 - bent housing assembly, 4 - universal shaft assembly, 5 - drive shaft assembly, 6 - upper housing of drive shaft, 7 - lower housing of drive shaft, 8 - drive shaft, 9 - adjusting sleeve, 10 - chute, 11 - centering strip, 12 - first inclined plane, 13 - second inclined plane, 14 - upper coarse pressure - regulating block, 15 - third inclined plane, 16 - lower coarse pressure - regulating block, 17 - fourth inclined plane, 18 - radial adjusting piece, 19 - locking nut, 20 - first conical surface, 21 - second conical surface, 22 - support block, 23 - adjusting screw hole, 24 - fine - tuning screw, 25 - fine - tuning pressure block, 26 - fifth inclined plane, 27 - sixth inclined plane, 28 - support rod, 29 - sealing screw, 30 - inner ring of bearing, 31 - outer ring of upper bearing, 32 - outer ring of lower bearing, 33 - sliding ring, 34 - upper composite piece group, 35 - lower composite piece group, 36 - support part, 37 - upper disc spring group, 38 - support ring, 39 - lower disc spring group, 40 - static sleeve of upper radial bearing, 41 - moving sleeve of upper radial bearing, 42 - mounting ring groove, 43 - circlip for hole, 44 - moving sleeve of lower radial bearing, 45 - anti - dropping ring, 46 - clamping strip, 47 - first limiting ring, 48 - second limiting ring, 49 - support ring. Specific implementation manners

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Figures 1 to 7 The embodiment of the present invention is shown. In the accompanying drawings, the positive displacement motor is placed horizontally, that is, the upper end in the embodiment is the left end shown in the figure, and the lower end is the right end shown in the figure.

[0034] Embodiment:

[0035] A positive displacement motor drill with a stabilizer having a quick-change and three-way position adjustable function, comprising a drop prevention assembly 1, a motor assembly 2, a bent housing assembly 3, a universal shaft assembly 4, and a drive shaft assembly 5 arranged in sequence from top to bottom. The drive shaft assembly 5 includes a drive shaft upper housing 6 and a drive shaft lower housing 7 connected up and down, and a drive shaft 8 rotatably arranged in the drive shaft upper housing 6 and the drive shaft lower housing 7. An adjustment sleeve 9 is sleeved and installed outside the drive shaft upper housing 6. A chute 10 is arranged on the outer wall of the adjustment sleeve 9 in the up and down direction. A stabilizer bar 11 is installed in the chute 10. The outside of the stabilizer bar 11 protrudes from the chute 10. The upper and lower ends of the stabilizer bar 11 are respectively provided with a first inclined surface 12 and a second inclined surface 13. The first inclined surface 12 slopes downward from the bottom of the chute 10 to the notch of the chute 10, and the second inclined surface 13 slopes upward from the bottom of the chute 10 to the notch of the chute 10. An upper coarse pressure regulating block 14 is adjustably installed on the upper side of the stabilizer bar 11 in the chute 10. The lower end of the upper coarse pressure regulating block 14 is provided with a third inclined surface 15 that slidably fits with the first inclined surface 12. A lower coarse pressure regulating block 16 is adjustably installed on the lower side of the stabilizer bar 11 in the chute 10. The upper end of the lower coarse pressure regulating block 16 is provided with a fourth inclined surface 17 that slidably fits with the second inclined surface 13; a radial adjusting piece 18 is detachably arranged between the stabilizer bar 11 and the bottom of the chute 10. When a certain stabilizer bar 11 is excessively worn during use and cannot work properly, a radial adjusting piece 18 with a suitable thickness is added between the stabilizer bar 11 and the bottom of the chute 10 to increase the part of the stabilizer bar 11 protruding from the chute 10, so as to make up for the worn part of the stabilizer bar 11 due to use. After the adjustment is completed, the stabilizer bar 11 is fixed by the cooperation of the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16. Through the cooperation of the first inclined surface 12 and the third inclined surface 15, and the cooperation of the second inclined surface 13 and the fourth inclined surface 17, after the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 are fixed, the up and down movement of the stabilizer bar 11 can be well restricted, thereby improving the firmness of the installation of the stabilizer bar 11. It improves the situation that the repair and replacement of the previous stabilizer bar 11 need to be sent back to the factory for repair. In the present invention, on the construction site, technicians can quickly complete the adjustment or replacement of the stabilizer bar 11 through the adjustment and regulation of a small number of accessories, avoiding the construction period delay caused by repair. The quick-change function of the stabilizer bar 11 can extend the service life of the positive displacement motor drill on the wellhead. The stabilizer bar 11 is adjustable in three-way position, that is, the function of adjusting the up and down position and the radial position of the outer diameter of the stabilizer bar 11 through the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 can improve the build-up angle ability of the screw. The production, repair and disassembly of the new stabilizer structure become easy, and the management cost is reduced. It solves the problem that the outer diameter of the stabilizer bar 11 in the prior art cannot be adjusted. It solves the problem that the axial position of the stabilizer bar 11 in the prior art cannot be adjusted.

[0036] The upper groove wall and the lower groove wall of the sliding groove 10 are respectively communicated with the upper end and the lower end of the adjusting sleeve 9. A locking nut 19 is sleeved on the upper side of the adjusting sleeve 9 by means of threads on the upper housing 6 of the transmission shaft. The lower end of the locking nut 19 is inclined downward from the inner wall to the outer wall to form a first conical surface 20. The upper end of the upper coarse pressure regulating block 14 is provided with a second conical surface 21 that slidably fits with the first conical surface 20. A support ring 49 is formed by protruding from the outer wall around the lower end of the lower housing 7 of the transmission shaft. The lower end of the adjusting sleeve 9 and the upper side of the support ring 49 are in top contact. A support block 22 extending into the sliding groove 10 is provided at the position of the support ring 49 corresponding to the sliding groove 10. An adjusting screw hole 23 is provided on the support block 22. The upper end of the adjusting screw hole 23 is communicated with the upper side of the support block 22, and the lower end extends to be communicated with the lower side of the support ring 49. A fine adjustment screw 24 is threadedly connected in the adjusting screw hole 23. A fine adjustment pressure block 25 is provided between the lower coarse pressure regulating block 16 and the support block 22 in the sliding groove 10. The lower side of the lower coarse pressure regulating block 16 is provided with a fifth inclined surface 26 parallel to the second inclined surface 13. The upper end of the fine adjustment pressure block 25 is provided with a sixth inclined surface 27 that slidably fits with the fifth inclined surface 26. A support rod 28 is provided on the lower side of the lower coarse pressure regulating block 16. The support rod 28 passes through the adjusting screw hole 23 and is in top contact with the upper end of the fine adjustment screw 24. When the positive displacement motor needs to replace the eccentric centralizer, only the corresponding-direction centralizing strip 11 needs to be replaced. That is, the locking nut 19 and the fine adjustment screw 24 are loosened in sequence, the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 are moved, the wider centralizing strip 11 is installed, and then the locking nut 19 is tightened and the fine adjustment screw 24 is tightened in sequence, and finally the locking nut 19 is tightened. When different deflecting capabilities are required for the positive displacement motor centralizer, only the positions of the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 with different lengths need to be interchanged, or the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 with different thicknesses are replaced. That is, the locking nut 19 and the sealing screw 29 are loosened in sequence, the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 are replaced and moved, the centralizing strip 11 is reinstalled, and then the locking nut 19 is tightened and the fine adjustment screw 24 is tightened in sequence, and finally the locking nut 19 is tightened. When eccentric wear occurs to the positive displacement motor centralizer, only the radial adjustment piece 18 needs to be added, and when necessary, the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 with different thicknesses are replaced. That is, the locking nut 19 and the sealing screw 29 are loosened in sequence, the upper coarse pressure regulating block 14 and the lower coarse pressure regulating block 16 are moved and replaced, the radial adjustment piece 18 is installed, the eccentric-worn centralizing strip 11 is installed, and then the locking nut 19 is tightened and the fine adjustment screw 24 is tightened in sequence, and finally the locking nut 19 is tightened. With the cooperation of the first conical surface 20 and the second conical surface 21, the upper end of the upper coarse pressure regulating block 14 can be fixed by the locking nut 19. With the cooperation of the fifth inclined surface 26 and the sixth inclined surface 27, the lower end of the lower coarse pressure regulating block 16 can be fixed. Thus, when the locking nut 19 is tightened and the fine adjustment screw 24 is tightened, the upper end of the centralizing strip 11 is fixed by the lower end of the upper coarse pressure regulating block 14, and the lower end of the centralizing strip 11 is fixed by the upper end of the lower coarse pressure regulating block 16.

[0037] A sealing screw 29 is threadedly connected below the adjusting screw hole 23 in a threaded fit with the fine-tuning screw 24. By providing the sealing screw 29, the adjusting screw hole 23 can be sealed, reducing the impact of mud on the fine-tuning screw 24, protecting the fine-tuning screw 24, and at the same time preventing the fine-tuning screw 24 from loosening.

[0038] The outer wall of the transmission shaft 8 and the transmission shaft upper housing 6 are rotatably connected by a composite sheet bearing.

[0039] The composite sheet bearing includes a bearing inner ring 30, an upper bearing outer ring 31, and a lower bearing outer ring 32. The inner wall of the bearing inner ring 30 is in contact with the outer wall of the transmission shaft 8. A sliding ring 33 is formed to protrude outward in the middle of the outer wall of the bearing inner ring 30. The upper bearing outer ring 31 is sleeved on the outer wall of the bearing inner ring 30 above the sliding ring 33, and the lower side of the upper bearing outer ring 31 is in sliding contact with the upper side of the sliding ring 33. The lower bearing outer ring 32 is sleeved on the outer wall of the bearing inner ring 30 below the sliding ring 33, and the upper side of the lower bearing outer ring 32 is in sliding contact with the lower side of the sliding ring 33. The outer rings of the upper bearing outer ring 31 and the lower bearing outer ring 32 are both in contact with the inner wall of the transmission shaft upper housing 6.

[0040] A first ring groove is recessed on the upper side of the sliding ring 33, and a second ring groove is recessed on the lower side. A third ring groove aligned with the first ring groove is recessed on the lower side of the upper bearing outer ring 31, and a fourth ring groove aligned with the second ring groove is recessed on the upper side of the lower bearing outer ring 32. An upper composite sheet group 34 is filled between the first ring groove and the third ring groove, and a lower composite sheet group 35 is filled between the second ring groove and the fourth ring groove. By providing the first ring groove and the third ring groove, the upper composite sheet group 34 can be well fixed. By the second ring groove and the fourth ring groove, the lower composite sheet group 35 can be well fixed. Both the upper composite sheet group 34 and the lower composite sheet group 35 adopt PDC composite sheet groups. The PDC composite sheet bearing can withstand high drilling pressure and torque. In drilling operations, the positive displacement motor needs to transmit the torque on the ground to the drill bit and at the same time withstand the reaction force during the drilling process of the drill bit. The cemented carbide matrix of the PDC bearing provides good strength support, while the diamond micropowder layer enhances its compressive capacity. The friction coefficient of the PDC composite sheet bearing is relatively low. When the positive displacement motor is working, the low friction coefficient helps to reduce energy loss and improve energy transfer efficiency. The PDC bearing has good corrosion resistance, and its structure enables it to remain stable in this corrosive environment.

[0041] The inner wall of the upper housing 6 of the transmission shaft protrudes inwardly above the outer ring 31 of the upper bearing to form a support portion 36. The lower side of the support portion 36 is in top contact with the upper side of the outer ring 31 of the upper bearing through an upper disc spring group 37; the upper end of the lower housing 7 of the transmission shaft is connected with a support ring 38 inside the upper housing 6 of the transmission shaft. The upper side of the support ring 38 and the lower side of the outer ring 32 of the lower bearing are in top contact through a lower disc spring group 39. By providing the upper disc spring group 37, the upper composite piece group 34 can be made to fit the first annular groove and the third annular groove during operation through the elasticity of the upper disc spring group 37. At the same time, when the upper composite piece group 34 is impacted, it plays a buffering role, avoiding the breakage of the upper composite piece group 34 and improving the service life of the upper composite piece group 34. Similarly, the lower disc spring group 39 also plays a protective role for the lower composite piece group 35, avoiding breakage when being impacted.

[0042] The upper housing 6 of the transmission shaft and the transmission shaft 8 are rotationally connected through an upper radial bearing stationary sleeve 40 and an upper radial bearing rotating sleeve 41 above the composite piece bearing. The outer wall of the upper radial bearing stationary sleeve 40 is in contact with the inner wall of the upper housing 6 of the transmission shaft, the upper radial bearing rotating sleeve 41 is in contact with the outer wall of the transmission shaft 8, and the outer wall of the upper radial bearing rotating sleeve 41 and the inner wall of the upper radial bearing stationary sleeve 40 are in rotational contact; an installation annular groove 42 is provided around the inner wall of the upper end of the upper housing 6 of the transmission shaft, and a hole retaining ring 43 is installed in the installation annular groove 42. The upper end of the upper radial bearing stationary sleeve 40 is in top contact with the lower side of the hole retaining ring 43. The upper radial bearing stationary sleeve 40 and the upper radial bearing rotating sleeve 41 are used to fill the gap between the rotating shaft above the composite piece bearing and the upper housing 6 of the transmission shaft, thereby improving the rotational stability of the transmission shaft 8. And the upper end of the upper radial bearing rotating sleeve 41 is limited in position by an elastic retaining ring, and the lower end abuts against the upper end of the bearing inner ring 30 of the composite piece bearing to limit the position of the bearing inner ring 30.

[0043] A lower radial bearing moving sleeve 44 is sleeved on the outer wall near the lower end of the transmission shaft 8, and the inner wall of the lower end of the lower radial bearing moving sleeve 44 is threadedly connected to the outer wall of the lower end of the transmission shaft 8; a falling prevention ring 45 is installed at the position of the upper end of the transmission shaft 8 in the lower radial bearing moving sleeve 44, and the inner wall of the lower end of the falling prevention ring 45 is fixed on the transmission shaft 8 by means of threaded connection. The inner wall of the upper end of the lower radial bearing moving sleeve 44 is connected to the outer wall of the lower end of the falling prevention ring 45 through a clamping strip 46; the falling prevention ring 45 bulges outward above the lower radial bearing moving sleeve 44 to form a first limiting ring 47, and the inner wall of the transmission shaft lower housing 7 bulges inward below the first limiting ring 47 to form a second limiting ring 48 that cooperates with the first limiting ring 47. The outer diameter of the first limiting ring 47 is larger than the inner diameter of the second limiting ring 48. Through the cooperation of the first limiting ring 47 and the second limiting ring 48, it is possible to prevent the falling prevention ring 45 from falling out of the transmission shaft lower housing 7. The inner wall of the falling prevention ring 45 is threadedly connected to the transmission shaft 8, so that when the upper part of the transmission shaft 8 breaks, the falling prevention ring 45 can be used to prevent the broken part of the transmission shaft 8 from falling out of the lower end of the transmission shaft lower housing 7 and falling into the drilling hole, which requires fishing and wastes manpower and material resources. Through the lower radial bearing moving sleeve 44, the gap between the transmission shaft 8 and the transmission shaft lower housing 7 can be filled, improving the rotational stability of the transmission shaft 8. At the same time, by means of the threaded connection between the lower radial bearing moving sleeve 44 and the position of the transmission shaft 8 near the lower end, and cooperating with the clamping strip 46 to connect the lower radial bearing moving sleeve 44 and the falling prevention ring 45 together, when the lower part of the transmission shaft 8 breaks, it is still possible to use the falling prevention ring 45 to prevent the broken part from falling into the drilling hole.

[0044] Although the present invention has been described herein with reference to various illustrative embodiments of the invention, it should be understood that those skilled in the art can devise many other modifications and embodiments that will fall within the scope and spirit of the principles disclosed in this application. More specifically, within the scope of the present application disclosure, the drawings, and the claims, various variations and improvements can be made to the components and / or arrangements of the subject combination layout. In addition to the variations and improvements made to the components and / or arrangements, other uses will also be apparent to those skilled in the art.

Claims

1. A positive displacement motor with a centralizer having a quick-change and three-way position adjustable function, comprising a drop prevention assembly (1), a motor assembly (2), a bent housing assembly (3), a universal shaft assembly (4) and a drive shaft assembly (5) sequentially arranged from top to bottom, characterized in that, The drive shaft assembly (5) includes an upper drive shaft housing (6) and a lower drive shaft housing (7) connected up and down, and a drive shaft (8) rotatably arranged in the upper drive shaft housing (6) and the lower drive shaft housing (7). An adjustment sleeve (9) is sleeved and installed outside the upper drive shaft housing (6). A chute (10) is arranged on the outer wall of the adjustment sleeve (9) in the up and down direction. A straightening strip (11) is installed in the chute (10). The outer side of the straightening strip (11) protrudes from the chute (10). The upper and lower ends of the straightening strip (11) are respectively provided with a first inclined surface (12) and a second inclined surface (13). The first inclined surface (12) slopes downward from the bottom of the chute (10) to the notch of the chute. The second inclined surface (13) slopes upward from the bottom of the chute (10) to the notch of the chute. An upper coarse pressure regulating block (14) is adjustably installed on the upper side of the straightening strip (11) in the chute (10). The lower end of the upper coarse pressure regulating block (14) is provided with a third inclined surface (15) that slidably fits with the first inclined surface (12). A lower coarse pressure regulating block (16) is adjustably installed on the lower side of the straightening strip (11) in the chute (10). The upper end of the lower coarse pressure regulating block (16) is provided with a fourth inclined surface (17) that slidably fits with the second inclined surface (13); A radial adjusting piece (18) is detachably arranged between the straightening strip (11) and the bottom of the chute (10); The upper and lower groove walls of the chute (10) are respectively communicated with the upper and lower ends of the adjustment sleeve (9). A locking nut (19) is threadedly sleeved on the upper side of the adjustment sleeve (9) on the upper drive shaft housing (6). The lower end of the locking nut (19) slopes downward from the inner wall to the outer wall to form a first conical surface (20). The upper end of the upper coarse pressure regulating block (14) is provided with a second conical surface (21) that slidably fits with the first conical surface (20). A support ring (49) is formed by protruding the outer wall around the lower end of the lower drive shaft housing (7). The lower end of the adjustment sleeve (9) and the upper side of the support ring (49) are in top contact. A support block (22) extending into the chute (10) is arranged at the position corresponding to the chute (10) on the upper side of the support ring (49). An adjusting screw hole (23) is arranged on the support block (22). The upper end of the adjusting screw hole (23) is communicated with the upper side of the support block (22), and the lower end extends to be communicated with the lower side of the support ring (49). A fine adjustment screw (24) is threadedly connected in the adjusting screw hole (23). A fine adjustment pressure block (25) is arranged between the lower coarse pressure regulating block (16) and the support block (22) in the chute (10). The lower side of the lower coarse pressure regulating block (16) is provided with a fifth inclined surface (26) parallel to the second inclined surface (13). The upper end of the fine adjustment pressure block (25) is provided with a sixth inclined surface (27) that slidably fits with the fifth inclined surface (26).

2. The positive displacement motor with a centralizer having a quick-change and three-way position adjustable function according to claim 1, characterized in that: A support rod (28) is arranged on the lower side of the lower coarse pressure regulating block (16). The support rod (28) passes through the adjusting screw hole (23) and is in top contact connection with the upper end of the fine adjustment screw (24).

3. The positive displacement motor with a centralizer having a quick-change and three-way position adjustable function according to claim 2, wherein: The adjusting screw hole (23) is threadedly connected with a sealing screw (29) below the fine-tuning screw (24).

4. The positive displacement motor with a centralizer having a quick-change and three-way position adjustable function according to claim 1, characterized in that: The outer wall of the transmission shaft (8) and the transmission shaft upper housing (6) are rotationally connected through a composite film bearing.

5. The positive displacement motor with a centralizer having a quick-change and three-way position adjustable function according to claim 4, characterized in that: The composite film bearing includes a bearing inner ring (30), an upper bearing outer ring (31) and a lower bearing outer ring (32). The inner wall of the bearing inner ring (30) is attached to the outer wall of the transmission shaft (8). A sliding ring (33) is formed to protrude outward in the middle of the outer wall of the bearing inner ring (30). The upper bearing outer ring (31) is sleeved on the outer wall of the bearing inner ring (30) on the upper side of the sliding ring (33), and the lower side of the upper bearing outer ring (31) is slidably attached to the upper side of the sliding ring (33). The lower bearing outer ring (32) is sleeved on the outer wall of the bearing inner ring (30) on the lower side of the sliding ring (33), and the upper side of the lower bearing outer ring (32) is slidably attached to the lower side of the sliding ring (33). The outer rings of the upper bearing outer ring (31) and the lower bearing outer ring (32) are both attached to the inner wall of the transmission shaft upper housing (6).

6. The positive displacement motor with a centralizer having quick-change and three-way position adjustable functions according to claim 5, characterized in that: A first ring groove is recessed on the upper side of the sliding ring (33), and a second ring groove is recessed on the lower side. A third ring groove aligned with the first ring groove is recessed on the lower side of the upper bearing outer ring (31). A fourth ring groove aligned with the second ring groove is recessed on the upper side of the lower bearing outer ring (32). An upper composite film group (34) is filled between the first ring groove and the third ring groove, and a lower composite film group (35) is filled between the second ring groove and the fourth ring groove.

7. The positive displacement motor with a centralizer having a quick-change and three-way position adjustable function according to claim 6, characterized in that: A support portion (36) protrudes inward above the upper bearing outer ring (31) on the inner wall of the transmission shaft upper housing (6). The lower side of the support portion (36) is in top contact with the upper side of the upper bearing outer ring (31) through an upper disc spring group (37). At the upper end of the transmission shaft lower housing (7), a support ring (38) is connected inside the transmission shaft upper housing (6). The upper side of the support ring (38) and the lower side of the lower bearing outer ring (32) are in top contact through a lower disc spring group (39).

8. The positive displacement motor with a centralizer having quick-change and three-way position adjustable functions according to claim 1, characterized in that: The transmission shaft upper housing (6) and the transmission shaft (8) are rotationally connected through an upper radial bearing static sleeve (40) and an upper radial bearing moving sleeve (41) on the upper side of the composite film bearing. The outer wall of the upper radial bearing static sleeve (40) is attached to the inner wall of the transmission shaft upper housing (6). The upper radial bearing moving sleeve (41) is attached to the outer wall of the transmission shaft (8). The outer wall of the upper radial bearing moving sleeve (41) is rotationally attached to the inner wall of the upper radial bearing static sleeve (40). An installation ring groove (42) is provided around the inner wall of the upper end of the transmission shaft upper housing (6). A hole retaining ring (43) is installed in the installation ring groove (42). The upper end of the upper radial bearing static sleeve (40) is in top contact with the lower side of the hole retaining ring (43).

9. The positive displacement motor with a centralizer having a quick-change and three-way position adjustable function according to claim 1, characterized in that: A lower radial bearing moving sleeve (44) is sleeved on the outer wall near the lower end of the transmission shaft (8). The inner wall of the lower end of the lower radial bearing moving sleeve (44) is threadedly connected to the outer wall of the lower end of the transmission shaft (8). An anti-falling ring (45) is installed at the position of the upper end of the transmission shaft (8) on the lower radial bearing moving sleeve (44). The inner wall of the lower end of the anti-falling ring (45) is fixed on the transmission shaft (8) by means of threaded connection. The inner wall of the upper end of the lower radial bearing moving sleeve (44) is connected to the outer wall of the lower end of the anti-falling ring (45) through a clamping strip (46). The anti-falling ring (45) protrudes outward above the lower radial bearing moving sleeve (44) to form a first limiting ring (47). The inner wall of the transmission shaft lower housing (7) protrudes inward below the first limiting ring (47) to form a second limiting ring (48) that cooperates with the first limiting ring (47). The outer diameter of the first limiting ring (47) is larger than the inner diameter of the second limiting ring (48).

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