Novel transmission shaft assembly of screw drill

Abstract

The novel transmission shaft assembly comprises a transmission shaft, and the transmission shaft is sequentially sleeved with a positioning ring, a lower sliding bearing movable sleeve, a lock nut, a string bearing and an upper sliding bearing movable sleeve from bottom to top. A lower sliding bearing static sleeve is sleeved outside the lower sliding bearing movable sleeve, a spacer bush is sleeved outside the lock nut, and an upper sliding bearing static sleeve is sleeved outside the upper sliding bearing movable sleeve; a shell is sleeved outside the lower sliding bearing static sleeve, the spacer bush string bearing and the upper sliding bearing static sleeve; the water cap is positioned at the top of the upper sliding bearing movable sleeve and is in threaded connection with the transmission shaft; a slurry discharging groove I, an upper ring groove and a lower ring groove are formed in the inner diameter part of the string placing bearing in the shell; a second slurry discharging groove is formed in the large end face of the upper sliding bearing static sleeve. A third slurry discharging groove is formed in one end face of the spacer bush. The slurry discharging groove is formed, so that the route of slurry is changed, and the service life of the string bearing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of positive displacement motors, in particular to a novel drive shaft assembly of a positive displacement motor. Background Art

[0002] The drive shaft assembly of the positive displacement motor for an oil drilling rig consists of a drive shaft, a housing, the stationary sleeve and rotating sleeve of the upper sliding bearing, the stationary sleeve and rotating sleeve of the lower sliding bearing, a water cap, a spacer sleeve, a lock nut, a positioning ring, and a series bearing. The service life of the bearing is generally about 150 hours. The user requests a service life of 300 hours. This bearing has no sealing device and uses the mud for drilling as lubrication. The bearing wears and damages very seriously, mainly the steel balls wear. It is necessary to lift the drilling rig from the well to the ground to replace the steel balls or new bearings after about 100 hours. The user hopes to lift it to the ground for replacement together with other equipment parts at 300 hours. This reduces the replacement times and improves the efficiency of the drilling rig. Content of the Utility Model

[0003] The utility model provides a novel drive shaft assembly of a positive displacement motor to solve the above problems.

[0004] To solve the above technical problems, the technical solution of the utility model is: the novel drive shaft assembly of the positive displacement motor includes a drive shaft, and a positioning ring, a rotating sleeve of the lower sliding bearing, a lock nut, a series bearing, and a rotating sleeve of the upper sliding bearing are sleeved on the drive shaft in sequence from bottom to top; a stationary sleeve of the lower sliding bearing is sleeved outside the rotating sleeve of the lower sliding bearing, a spacer sleeve is sleeved outside the lock nut, and a stationary sleeve of the upper sliding bearing is sleeved outside the rotating sleeve of the upper sliding bearing; a housing is sleeved outside the stationary sleeve of the lower sliding bearing, the spacer sleeve, the series bearing, and the stationary sleeve of the upper sliding bearing; the water cap is located at the top of the rotating sleeve of the upper sliding bearing and is threadedly connected with the drive shaft; a slurry discharge groove one, an upper ring groove, and a lower ring groove are formed at the inner diameter of the housing where the series bearing is placed; a slurry discharge groove two is formed at the large end face of the stationary sleeve of the upper sliding bearing; and a slurry discharge groove three is formed at one end face of the spacer sleeve.

[0005] Further, the positioning ring is in clearance fit with the drive shaft.

[0006] Further, the rotating sleeve of the lower sliding bearing is in clearance fit with the drive shaft.

[0007] Further, the lock nut is threadedly connected with the drive shaft.

[0008] Further, the rotating sleeve of the upper sliding bearing is in clearance fit with the drive shaft.

[0009] Further, the spacer sleeve is located between the series bearing and the stationary sleeve of the lower sliding bearing.

[0010] Further, the slurry discharge groove one is distributed along the inner diameter generatrix direction.

[0011] Further, the slurry discharge groove two is formed by surrounding the large end face.

[0012] Further, the slurry discharge groove three is opened around the end face of the tandem bearing.

[0013] Further, the tandem bearing is filled with grease.

[0014] The utility model changes the route of the slurry by opening the slurry discharge groove, and improves the service life of the tandem bearing. Description of the Drawings

[0015] Figure 1 is a schematic structural diagram of the utility model;

[0016] Figure 2 is a cross-sectional view of the housing;

[0017] Figure 3 is Figure 2 the A-A cross-sectional view of

[0018] Figure 4 is a cross-sectional view of the static sleeve of the upper sliding bearing;

[0019] Figure 5 is a top view of the static sleeve of the upper sliding bearing;

[0020] Figure 6 is a cross-sectional view of the spacer sleeve;

[0021] Figure 7 is a top view of the spacer sleeve.

[0022] Wherein: 1. water cap; 2. housing; 3. moving sleeve of the upper sliding bearing; 4. static sleeve of the upper sliding bearing; 5. tandem bearing; 6. lock nut; 7. spacer sleeve; 8. static sleeve of the lower sliding bearing; 9. moving sleeve of the lower sliding bearing; 10. transmission shaft; 11. positioning ring; 12. slurry discharge groove one; 13. slurry discharge groove two; 14. slurry discharge groove three; 15. upper ring groove; 16. lower ring groove. Detailed Embodiments

[0023] The following further describes the detailed embodiments of the utility model in conjunction with the attached Figure 1-7 drawings.

[0024] A new type of drive shaft assembly for a positive displacement motor drill includes a drive shaft 10. A positioning ring 11, a lower sliding bearing moving sleeve 9, a lock nut 6, a series bearing 5, and an upper sliding bearing moving sleeve 3 are sleeved on the drive shaft 10 from bottom to top in sequence. The positioning ring 11 has a clearance fit with the drive shaft 10, the lower sliding bearing moving sleeve 9 has a clearance fit with the drive shaft 10, the lock nut 6 is threadedly connected to the drive shaft 10, and the upper sliding bearing moving sleeve 3 has a clearance fit with the drive shaft 10. A lower sliding bearing static sleeve 8 is sleeved outside the lower sliding bearing moving sleeve 9, a spacer sleeve 7 is sleeved outside the lock nut 6, and the spacer sleeve 7 is located between the series bearing 5 and the lower sliding bearing static sleeve 8. An upper sliding bearing static sleeve 4 is sleeved outside the upper sliding bearing moving sleeve 3. The lower sliding bearing static sleeve 8, the spacer sleeve 7, the series bearing 5, and the upper sliding bearing static sleeve 4 are sleeved outside a housing 2. A water cap 1 is located at the top of the upper sliding bearing moving sleeve 3 and is threadedly connected to the drive shaft 10. A first slurry discharge groove 12, an upper ring groove 15, and a lower ring groove 16 are provided at the inner diameter of the series bearing 5 in the housing 2. The first slurry discharge groove 12 is distributed along the inner diameter generatrix direction. The upper ring groove 15 and the lower ring groove 16 enable the flowing slurry to enter the first slurry discharge groove 12 unobstructed and then enter the third slurry discharge groove 14 of the lower spacer sleeve 7 unobstructed. A second slurry discharge groove 13 is provided on the large end face of the upper sliding bearing static sleeve 4, and the second slurry discharge groove 13 is provided around the large end face. A third slurry discharge groove 14 is provided on one end face of the spacer sleeve 7, and the third slurry discharge groove 14 is provided around the end face of the series bearing.

[0025] The positive displacement motor drill is a container-type downhole motor drill that uses drilling fluid, i.e., slurry, as power to convert liquid pressure energy into mechanical energy. Therefore, when the drive shaft of the positive displacement motor drill rotates, the slurry forms a pressure difference from top to bottom to push the drive shaft to rotate. Another function of the slurry is to enter the upper and lower sliding bearings and the series bearing 5 to play a lubricating role. Finally, the slurry needs to be discharged outside the positive displacement motor drill.

[0026] To increase the service life of the series bearing 5, the bearing lubrication method should be changed to avoid slurry lubrication. Because slurry lubrication will cause serious wear to the bearing. The actual situation is that the steel balls and the inner and outer rings of the bearing are severely worn, resulting in bearing failure. Therefore, the series bearing 5 is completely sealed. At the position of the series bearing 5 on the inner diameter of the housing 2, a ring is turned on the inner diameter ring and multiple first slurry discharge grooves 12 are turned on the circumference from top to bottom. Multiple deep second slurry discharge grooves 13 are provided on the circumference of the large end face of the upper sliding bearing static sleeve 4. Multiple deep third slurry discharge grooves 14 are provided at the end face of the spacer sleeve 7 corresponding to the series bearing. In this way, the slurry coming from top to bottom can bypass the series bearing 5 and be transmitted through the housing 2 to the lower sliding bearing and then discharged outside.

[0027] The drive shaft 10 drives the lower sliding bearing moving sleeve 9, the upper sliding bearing moving sleeve 3, the lock nut 6, the positioning ring 11, and the water cap 1 to rotate together. The lower sliding bearing static sleeve 8, the upper sliding bearing static sleeve 4, and the spacer sleeve 7 are stationary.

[0028] Through the change of the above structure, the flow route of the mud is changed. The mud does not pass through the tandem bearing 5, and the tandem bearing 5 can be completely sealed. Grease can be injected into the tandem bearing 5. The wear of the internal parts of the bearing will be extremely reduced. The service life of the bearing will be extremely increased. It is completely achievable for the user to require a bearing life of 300 hours.

[0029] As described above, it is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A new drive shaft assembly for a positive displacement motor, characterized in that, It includes a transmission shaft (10). A positioning ring (11), a lower sliding bearing moving sleeve (9), a lock nut (6), a string bearing (5), and an upper sliding bearing moving sleeve (3) are sleeved on the transmission shaft (10) in sequence from bottom to top. A lower sliding bearing static sleeve (8) is sleeved outside the lower sliding bearing moving sleeve (9). A spacer sleeve (7) is sleeved outside the lock nut (6). An upper sliding bearing static sleeve (4) is sleeved outside the upper sliding bearing moving sleeve (3). A housing (2) is sleeved outside the lower sliding bearing static sleeve (8), the spacer sleeve (7), the string bearing (5), and the upper sliding bearing static sleeve (4). A water cap (1) is located at the top of the upper sliding bearing moving sleeve (3) and is threadedly connected to the transmission shaft (10). A slurry discharge groove one (12), an upper ring groove (15), and a lower ring groove (16) are provided at the inner diameter of the string bearing (5) placed inside the housing (2). A slurry discharge groove two (13) is provided on the large end face of the upper sliding bearing static sleeve (4). A slurry discharge groove three (14) is provided on one end face of the spacer sleeve (7).

2. The novel drive shaft assembly of the positive displacement motor according to claim 1, characterized in that, The positioning ring (11) is in clearance fit with the transmission shaft (10).

3. The novel drive shaft assembly of the positive displacement motor according to claim 1, wherein, The lower sliding bearing moving sleeve (9) is in clearance fit with the transmission shaft (10).

4. The novel drive shaft assembly of the positive displacement motor according to claim 1, characterized in that, The lock nut (6) is threadedly connected to the transmission shaft (10).

5. The novel drive shaft assembly of the positive displacement motor according to claim 1, wherein, The upper sliding bearing moving sleeve (3) is in clearance fit with the transmission shaft (10).

6. The novel drive shaft assembly of the positive displacement motor according to claim 1, characterized in that, The spacer sleeve (7) is located between the string bearing (5) and the lower sliding bearing static sleeve (8).

7. The novel drive shaft assembly of the positive displacement motor according to claim 1, characterized in that, The slurry discharge groove one (12) is distributed along the inner diameter generatrix direction.

8. The novel drive shaft assembly of the positive displacement motor according to claim 1, wherein, The slurry discharge groove two (13) is provided by surrounding the large end face.

9. The novel drive shaft assembly of the positive displacement motor according to claim 1, characterized in that, The slurry discharge groove three (14) is provided by surrounding the end face of the string bearing.

10. The novel drive shaft assembly of the positive displacement motor according to claim 1, characterized in that, The string bearing (5) is filled with grease.

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