Double-channel lubricating oil path structure of fracturing pump crankshaft

Abstract

The application discloses a double-flow channel lubricating oil path structure of a fracturing pump crankshaft, which comprises a planetary reducer, a rotary joint, a planetary reducer gear sleeve, a crankshaft oil channel and a crankshaft, the crankshaft is connected with the flange end of a spline flange, the spline end of the spline flange is connected with the output end of a crankshaft oil path communication pipe assembly, the input end of the crankshaft oil path communication pipe assembly passes through the outside side cover of the planetary reducer and is connected with the outside side cover of the planetary reducer through a supporting mechanism, and the input end of the crankshaft oil path communication pipe assembly is connected with the rotary joint. The application solves the problems of poor lubricating effect of the crankshaft of the fracturing pump with the planetary reducer with a large axial dimension and power input from two sides, and damage caused by the problems.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil and gas drilling and production equipment, and relates to a double-flow lubricating oil path structure of a fracturing pump crankshaft. BACKGROUND

[0002] At present, in the field of oil and gas drilling and production equipment, fracturing equipment is the main equipment for increasing production in the middle and late stages of oil wells, and the fracturing pump as a core component realizes the suction and discharge of fracturing fluid through the reciprocating movement of a plunger. The pressure and temperature of the fracturing fluid are high during work, so the power transmission device of the fracturing pump is also in a high-load working state. Since the transmission structure of the fracturing pump adopts a slider-crank structure, the working condition of the crankshaft connecting rod is very poor under such harsh working conditions. Therefore, sufficient lubrication of the matching surface between the fracturing pump crankshaft and the rack and the connecting rod is of great significance to the reliability of the fracturing pump. For many single-sided driving fracturing pumps, a rotary joint is usually installed at the non-power input end of the crankshaft to deliver lubricating oil to each lubricating point of the crankshaft, as shown in FIG. Figure 1 The lubricating oil enters the oil channel 14 in the crankshaft through the oil delivery hose 10, the rotary joint 9 and the oil nozzle joint 8, and finally lubricates the bearing between the crankshaft and the rack and the connecting rod. Since the oil channel 14 in the crankshaft is a small-diameter and many-right-angle-bend elongated hole, the resistance of the crankshaft oil channel 14 to the lubricating oil is large. In addition, due to the large axial size of the crankshaft, the pressure and flow of the lubricating oil at the end of the crankshaft are greatly reduced when the lubricating oil reaches the end of the crankshaft, and even there is no lubricating oil in the oil channel at the end of the crankshaft, which causes the bearing at the end of the crankshaft to burn out due to insufficient lubrication after the fracturing pump works for a period of time, and further causes damage to the fracturing pump. Therefore, it is necessary to adopt double-sided simultaneous delivery of lubricating oil for the crankshaft of the fracturing pump, and it is of great engineering significance to adopt a reliable structure to deliver lubricating oil through the reducer to the oil channel of the crankshaft, especially for the power input end of the crankshaft. Figure 1 SUMMARY

[0003] The application aims to provide a double-flow lubricating oil path structure of a fracturing pump crankshaft, which solves the problem of poor lubrication effect of the crankshaft of the fracturing pump with a large axial size of the planetary reducer and power input from both sides, and easy damage.

[0004] ​The technical solution adopted in this invention is a dual-flow-channel lubrication oil circuit structure for a fracturing pump crankshaft, including a planetary reducer, a rotary joint, a planetary reducer gear sleeve, a crankshaft oil passage, and a crankshaft. The crankshaft is connected to the flange end of a splined flange, the spline end of the splined flange is connected to the output end of the crankshaft oil circuit connecting pipe assembly, the input end of the crankshaft oil circuit connecting pipe assembly passes through the outer cover of the planetary reducer and is connected to the outer cover of the planetary reducer through a support mechanism, and the input end of the crankshaft oil circuit connecting pipe assembly is connected to the rotary joint.

[0005] The invention is further characterized in that,

[0006] An O-ring II is installed between the spline flange and the crankshaft.

[0007] The spline flange is an external spline flange, and the external spline of the spline flange is matched with the gear sleeve of the planetary reducer.

[0008] The inner wall of the spline flange end is provided with a groove, which is connected to the crankshaft oil passage.

[0009] The crankshaft oil circuit connecting pipe assembly includes a rotating oil pipe shaft. The output end of the rotating oil pipe shaft is provided with a boss, which is connected to a spline flange by a locating pin I. A baffle is provided above the boss, which is connected to the spline flange by a screw IV. The input end of the rotating oil pipe shaft is connected to a support mechanism.

[0010] An O-ring I is installed between the spline flange and the rotating oil pipe shaft.

[0011] The support mechanism includes a rotating oil pipe shaft support bearing, which is sleeved on the outer wall of the input end of the crankshaft oil passage connecting pipe assembly. A bearing cover is provided above the rotating oil pipe shaft support bearing, and the bearing cover is connected to the outer cover of the planetary reducer. A skeleton oil seal II is provided between the bearing cover and the crankshaft oil passage connecting pipe assembly.

[0012] The upper and lower end faces of the rotating oil pipe shaft support bearing are both equipped with bearing retaining rings.

[0013] The beneficial effect of the present invention is that the dual-flow-channel lubrication oil circuit structure of the crankshaft of the fracturing pump of the present invention can provide sufficient lubrication at the crank and connecting rod mating points at both ends of the crankshaft, thereby improving the life of the crankshaft and thus improving the life of the fracturing pump. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a fracturing pump structure driven by a planetary gearbox in the background art of the present invention, which describes a dual-channel lubrication oil circuit structure for a fracturing pump crankshaft.

[0015] Figure 2 This is a schematic diagram of the dual-channel lubrication oil circuit structure of a fracturing pump crankshaft according to the present invention;

[0016] Figure 3 This is a schematic diagram of the crankshaft oil circuit connecting pipe assembly in the dual-flow-channel lubrication oil circuit structure of a fracturing pump crankshaft according to the present invention;

[0017] Figure 4 This is a schematic diagram of the rotating oil pipe shaft in the dual-channel lubrication oil circuit structure of a fracturing pump crankshaft according to the present invention.

[0018] Figure 5 This is a schematic diagram of the support mechanism in the dual-channel lubrication oil circuit structure of a fracturing pump crankshaft according to the present invention;

[0019] Figure 6 This is a schematic diagram of the connection between the rotating oil pipe shaft and the spline flange in the dual-flow-channel lubrication oil circuit structure of a fracturing pump crankshaft according to the present invention.

[0020] Figure 7 This is a schematic diagram of the connection between the spline flange and the crankshaft in the dual-flow-channel lubrication oil circuit structure of a fracturing pump crankshaft according to the present invention;

[0021] Figure 8 This is a schematic diagram of the spline flange in the dual-channel lubrication oil circuit structure of a fracturing pump crankshaft according to the present invention.

[0022] In the diagram, 1. Crankshaft assembly, 2. Frame, 3. Planetary reducer, 4. Base, 5. Fracturing pump, 6. Crankshaft support bearing, 7. Screw I, 8. Oil nozzle connector, 9. Rotary joint, 10. Oil hose, 11. Oil seal seat, 12. Skeleton oil seal I, 13. Screw II, 14. Crankshaft oil passage, 15. Crankshaft oil passage connecting pipe assembly, 16. Spline flange, 17. Planetary reducer gear sleeve, 18. Rotary oil pipe shaft, 19. Screw III, 20. Bearing cap, 21. Skeleton oil seal II, 22. Rotary oil pipe shaft support bearing, 23. Bearing retaining ring, 24. Baffle, 25. Screw IV, 26. Locating pin I, 27. O-ring I, 28. Locating pin II, 29. O-ring II, 30. Screw V, 31. Crankshaft, 32. Groove, 33. Boss. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] This invention provides a dual-channel lubrication oil circuit structure for a fracturing pump crankshaft, the structure as follows: Figure 2 and 3 As shown, it includes a planetary reducer 3, a rotary joint 9, a planetary reducer gear sleeve 17, a crankshaft oil passage 14, and a crankshaft 31. The crankshaft 31 is connected to the flange end of the spline flange 16 by screws V30, as shown. Figure 7As shown, an O-ring seal II 29 is provided between the spline flange 16 and the crankshaft 31. The spline flange 16 and the crankshaft 31 are positioned and connected by a locating pin II 28. The spline flange 16 is an external spline flange with a hollow structure. The external splines of the spline flange 16 mate with the internal splines of the planetary reducer gear sleeve 17, as shown. Figure 8 As shown, a groove 32 is provided on the inner wall of the flange end of the spline flange 16. The groove 32 is connected to the crankshaft oil passage 14. The spline end of the spline flange 16 is connected to the output end of the crankshaft oil passage connecting pipe assembly 15. The input end of the crankshaft oil passage connecting pipe assembly 15 passes through the outer cover of the planetary reducer 3 and is connected to the outer cover of the planetary reducer 3 through a support mechanism. The input end of the crankshaft oil passage connecting pipe assembly 15 is connected to the rotary joint 9. The rotary joint 9 is connected to the oil supply hose 10 for oil supply and lubrication.

[0025] like Figure 3 , 4 As shown in Figure 6, the crankshaft oil passage connecting pipe assembly 15 includes a hollow rotating oil pipe shaft 18. The output end of the rotating oil pipe shaft 18 is provided with a boss 33. The boss 33 is connected to the spline flange 16 through a locating pin I 26. An O-ring seal I 27 is provided between the spline flange 16 and the rotating oil pipe shaft 18. A baffle 24 is provided above the boss 33. The baffle 24 is connected to the spline flange 16 through a screw IV 25. A support mechanism is connected to the input end of the rotating oil pipe shaft 18.

[0026] like Figure 5 As shown, the support mechanism includes a rotating oil pipe shaft support bearing 22, which is sleeved on the outer wall of the input end of the crankshaft oil passage connecting pipe assembly 15. Bearing retaining rings 23 are provided on both the upper and lower end faces of the rotating oil pipe shaft support bearing 22. A bearing cover 20 is provided above the rotating oil pipe shaft support bearing 22. The bearing cover 20 is connected to the outer cover of the planetary reducer 3 by screws III 19. A skeleton oil seal II 21 is provided between the bearing cover 20 and the crankshaft oil passage connecting pipe assembly 15.

[0027] The working principle of the dual-channel lubrication oil circuit structure for a fracturing pump crankshaft of the present invention is as follows: For fracturing pump drive types that use a planetary reducer 3 with a large axial dimension and a large distance between the outer cover of the planetary reducer 3 and the end face of the crankshaft, because the outer cover of the planetary reducer 3 is far from the end face of the crankshaft 31, lubricating oil can only be input to lubricate one end of the crankshaft 31 through the rotary joint 9. Due to the small diameter of the lubricating oil holes inside the crankshaft 31 and the frequent right-angle intersections of the oil holes, the resistance of the crankshaft oil passage 14 to the lubricating oil is relatively large, making it difficult to achieve a good lubrication effect at the other end of the crankshaft 31. The present invention uses a long rotating oil pipe shaft 18 to extend the crankshaft oil passage 14 to the outside of the planetary reducer 3. At the same time, to prevent the excessively long rotating oil pipe shaft 18 from swinging excessively when rotating with the crankshaft 31, a support mechanism is provided on the outer cover of the planetary reducer 3 to support one end of the rotating oil pipe shaft 18 and to provide radial positioning for the rotating oil pipe shaft 18. Then, the rotary joint 9 is installed in the threaded hole at one end of the rotary oil pipe shaft 18, which allows external lubricating oil to be input from both sides of the fracturing pump into the crankshaft oil passage 14 through the rotary oil pipe shaft 18, so that both ends of the crankshaft can get good lubrication, thereby improving the life of the crankshaft and the pressure pump.

Claims

1. A dual-channel lubrication oil circuit structure for a fracturing pump crankshaft, comprising a planetary reducer (3), a rotary joint (9), a planetary reducer gear sleeve (17), a crankshaft oil passage (14), and a crankshaft (31), characterized in that, The crankshaft (31) is connected to the flange end of the spline flange (16), the spline end of the spline flange (16) is connected to the output end of the crankshaft oil circuit connecting pipe assembly (15), the input end of the crankshaft oil circuit connecting pipe assembly (15) passes through the outer cover of the planetary reducer (3) and is connected to the outer cover of the planetary reducer (3) through a support mechanism, and the input end of the crankshaft oil circuit connecting pipe assembly (15) is connected to the rotary joint (9). The spline flange (16) is an external spline flange, and the external spline of the spline flange (16) is engaged with the planetary reducer gear sleeve (17); The inner wall of the flange end of the spline flange (16) is provided with a groove (32), which is connected to the crankshaft oil passage (14); The crankshaft oil passage connecting pipe assembly (15) includes a rotating oil pipe shaft (18), the output end of which is provided with a boss (33), the boss is connected to a spline flange (16) by a positioning pin I (26), a baffle (24) is provided above the boss (33), the baffle (24) is connected to the spline flange (16) by a screw IV (25), and a support mechanism is connected to the input end of the rotating oil pipe shaft (18). The support mechanism includes a rotary oil pipe shaft support bearing (22), which is sleeved on the outer wall of the input end of the crankshaft oil passage connecting pipe assembly (15). A bearing cover (20) is provided above the rotary oil pipe shaft support bearing (22), which is connected to the outer cover of the planetary reducer (3). A skeleton oil seal II (21) is provided between the bearing cover (20) and the crankshaft oil passage connecting pipe assembly (15).

2. The dual-channel lubrication oil circuit structure of a fracturing pump crankshaft according to claim 1, characterized in that, An O-ring II (29) is provided between the spline flange (16) and the crankshaft (31).

3. The dual-channel lubrication oil circuit structure of a fracturing pump crankshaft according to claim 1, characterized in that, An O-ring seal I (27) is provided between the spline flange (16) and the rotating oil pipe shaft (18).

4. The dual-channel lubrication oil circuit structure of a fracturing pump crankshaft according to claim 1, characterized in that, The upper and lower end faces of the rotating oil pipe shaft support bearing (22) are both provided with bearing retaining rings (23).

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