Variable speed drive mechanism for mud pumps

Abstract

The application provides a mud pump variable speed transmission mechanism, which comprises an input shaft, an intermediate shaft, a driven shaft, an output shaft and a gear shifting device, the input shaft is provided with a driving gear, the intermediate shaft is provided with an intermediate gear and a double gear, the driven shaft is provided with a driven gear, the output shaft is provided with an output gear, the driving gear and the intermediate gear are in mesh with each other, the driven gear and one side of the double gear are in mesh with each other, the gear shifting device comprises a clutch, the clutch is used for meshing or disconnecting the other side of the double gear with the output gear, the end of the driven shaft is further connected with an oil pump, and the oil pump is used for extracting and supplying lubricating oil to the gear shifting device. According to the technical scheme of the application, the planetary gear transmission and the gear transmission containing the double gear are combined, the speed regulating range of the variable speed mechanism is increased, in addition, the oil pump and the driven shaft are integrated with the main structure of the variable speed mechanism, so that the variable speed mechanism is compact in structure and the manufacturing cost of the whole variable speed mechanism is reduced.

Description

Technical Field

[0001] This invention belongs to the field of transmission mechanism technology, and in particular to a speed-changing transmission mechanism for a mud pump. Background Technology

[0002] In drilling projects, mud pumps are used to extract mud from the well. With the advancement of drilling technology, drilling depths are increasing, and drilling projects need to face various complex geological conditions. As drilling depth increases, the operating conditions and load of mud pumps also change continuously. Therefore, during on-site drilling, a speed-changing mechanism is needed to provide matching power to the mud pump according to process requirements. The speed-changing mechanism adjusts the operating speed and output torque of the mud pump to meet the pumping requirements of the mud pump drilling process.

[0003] For example, patent document CN208686925U discloses a novel gear transmission device for driving a mud pump, including an upper housing and a lower housing, which are bolted together to support the input shaft and output shaft. The input shaft is connected to a universal joint via a shaft end flange and drives the transmission device, while the output shaft is connected to the universal joint via a shaft end flange to drive the mud pump. The output shaft is equipped with a speed-changing mechanism, which can output different speeds by engaging high-speed and low-speed gears, meeting the pumping requirements of mud pump drilling processes. Furthermore, this patented technology employs a gear transmission device lubrication system to promptly address the significant heat generated during the meshing of gears, bearings, and other components in the transmission process. However, existing transmission mechanisms generally utilize gear transmission mechanisms. When it is necessary to increase the adjustment range of the transmission mechanism, a large number of gear pairs must be added, making the transmission mechanism bulky and cumbersome. Moreover, during the operation of the mud pump, the lubrication of the transmission mechanism itself must be considered. However, existing lubrication systems are generally auxiliary components of the transmission mechanism, which further complicates the structure of the transmission mechanism. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a variable speed transmission mechanism for a mud pump.

[0005] The present invention is achieved through the following technical solutions.

[0006] This invention provides a speed-changing transmission mechanism for a mud pump, comprising an input shaft, an intermediate shaft, a driven shaft, an output shaft, and a shifting device. The input shaft is equipped with a driving gear; the intermediate shaft is equipped with a first intermediate gear and a double gear; the driven shaft is equipped with a second driven gear; and the output shaft is equipped with a first output gear. The driving gear meshes with the first intermediate gear, and the second driven gear meshes with one side of the double gear. The shifting device includes a clutch, which is used to engage or disengage the other side of the double gear with the first output gear. The end of the driven shaft is also connected to an oil pump, which is used to extract and supply lubricating oil to the shifting device.

[0007] The shifting device also includes a brake, and the output shaft is also provided with a sun gear, which meshes with planet gears and the planet gears also mesh with the gear ring. The brake is used to make the gear ring rotate or stop rotating.

[0008] The number of planetary gears is three or more.

[0009] The gear ratio between the ring gear and the sun gear is 3.24.

[0010] The number of shifting devices is equal to the number of double gears.

[0011] The number of the shifting device or double gear is two.

[0012] The transmission ratio between the driving gear and the second driven gear is 2.1.

[0013] The transmission ratio between the first output gear and the second driven gear is 2.42 or 1.35.

[0014] The input shaft, intermediate shaft, and output shaft are parallel to each other, the output shaft, intermediate shaft, and driven shaft are parallel to each other, and the input shaft and driven shaft are coaxial.

[0015] The input shaft is also connected to the torque converter.

[0016] The beneficial effects of this invention are as follows: The technical solution of this invention combines planetary gear transmission with a gear transmission including double gears. Planetary gear transmission has the advantages of compact structure and large transmission ratio, increasing the speed range of the transmission mechanism. The double gears on the intermediate shaft, while meeting the same transmission ratio requirements, also make the transmission mechanism more compact. Furthermore, the oil pump, driven by the driven shaft, extracts and supplies lubricating oil to the shifting device, allowing the lubrication effect of the shifting device to vary according to the different operating conditions of the mud pump, thus improving lubrication efficiency. Moreover, the oil pump and driven shaft are integrated with the main structure of the transmission mechanism, simplifying the structure and making the entire transmission mechanism more compact, which helps reduce the overall manufacturing cost of the transmission mechanism. Attached Figure Description

[0017] Figure 1 This is a simplified diagram of the transmission mechanism of the present invention;

[0018] Figure 2 This is an equivalent transmission diagram of the speed change mechanism of the present invention when it is engaged in first gear;

[0019] Figure 3 This is a simplified equivalent transmission diagram of the speed change mechanism of the present invention when it is engaged in second gear;

[0020] Figure 4 This is a simplified equivalent transmission diagram of the speed change mechanism of the present invention when it is engaged in third gear;

[0021] Figure 5 This is a simplified diagram of the equivalent transmission when the speed change mechanism of the present invention is engaged in fourth gear.

[0022] In the diagram: 1-Input shaft, 2-Torque converter, 4-Drive gear, 5-First intermediate gear, 6-Intermediate shaft, 7-Second intermediate gear, 8-First driven gear, 9-Driven shaft, 10-Driven gear, 11-Gear A, 12-Gear B, 13-First output gear, 14-Clutch, 15-Brake, 16-Third driven gear, 17-Gear C, 18-Gear D, 19-Second output gear, 22-Output shaft, 23-Oil pump, 24-Shifting device, 25-Double gear, 26-Sun gear, 27-Planet gears, 28-Ring gear, 29-Planet carrier. Detailed Implementation

[0023] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0024] like Figures 1 to 5As shown, the present invention provides a mud pump speed change transmission mechanism, including an input shaft 1, an intermediate shaft 6, a driven shaft 9, an output shaft 22, and a shifting device 24. The input shaft 1 is provided with a driving gear 4, the intermediate shaft 6 is provided with a first intermediate gear 5 and a double gear 25, the driven shaft 9 is provided with a second driven gear 10, and the output shaft 22 is provided with a first output gear 13. The driving gear 4 meshes with the first intermediate gear 5, and the second driven gear 10 meshes with one side of the double gear 25. The shifting device 24 includes a clutch 14, which is used to engage or disengage the other side of the double gear 25 with the first output gear 13. The end of the driven shaft 9 is also connected to an oil pump 23, which is used to extract and supply lubricating oil to the shifting device 24.

[0025] The technical solution of this invention combines planetary gear transmission with gear transmission including double gears. Planetary gear transmission has the advantages of compact structure and large transmission ratio, which increases the speed range of the transmission mechanism. The double gear on the intermediate shaft makes the structure of the transmission mechanism more compact while meeting the same transmission ratio requirements. In addition, the oil pump is driven by the driven shaft to extract and supply lubricating oil to the shifting device, so that the lubrication effect of the shifting device changes accordingly with the different operating conditions of the mud pump, which helps to improve lubrication efficiency. Moreover, the oil pump and the driven shaft are integrated with the main structure of the transmission mechanism, which simplifies the structure of the transmission mechanism and makes the entire transmission mechanism more compact, which helps to reduce the manufacturing cost of the entire transmission mechanism.

[0026] Specifically, the shifting device 24 also includes a brake 15. A sun gear 26 is mounted on the output shaft 22, meshing with planet gears 27. The planet gears 27 also mesh with a ring gear 28. The brake 15 is used to rotate or stop the ring gear 28. All planet gears 27 are connected together via a planet carrier 29. There are three or more planet gears 27. The gear ratio between the ring gear 28 and the sun gear 26 is 3.24. The number of shifting devices 24 is equal to the number of double gears 25. There are two shifting devices 24 or double gears 25. The transmission ratio between the driving gear 4 and the second driven gear 10 is 2.1. The transmission ratio between the first output gear 13 and the second driven gear 10 is 2.42 or 1.35.

[0027] By adopting the technical solution of the present invention, the gear shifting operation is realized by using a clutch and a brake. When shifting gears, only one clutch or brake action needs to be performed, which helps to simplify the gear shifting operation method.

[0028] Specifically, when there are two double gears, the first double gear is composed of gear A11 and gear B12, and the second double gear is composed of gear C17 and gear D18. Correspondingly, there are two shifting devices 24, which are composed of clutch L1, clutch L2, brake Z1, and brake Z2. There are two output gears, including the first output gear 13 and the second output gear 19. There are two intermediate gears, including the first intermediate gear 5 and the second intermediate gear 7. There are three driven gears, including the first driven gear 8, the second driven gear 10, and the third driven gear 16. There are two sun gears 26, two planet gears 27, and two ring gears 28, which form the first planetary gear train and the second planetary gear train, respectively. Let the transmission ratio of the first planetary gear train be a1 and the transmission ratio of the second planetary gear train be a2.

[0029] When the transmission mechanism is in neutral, all brakes and clutches are disengaged, and there is no output from the output shaft.

[0030] Figure 2 The diagram shows the equivalent transmission when the gearbox is engaged in first gear. At this time, only the clutch L2 on the right side of the diagram is engaged, and the transmission ratio between the output shaft and the input shaft is:

[0031] i1=Z5*Z8 / (Z4*Z7)*Z17*Z19 / (Z16*Z18).

[0032] Figure 3 The diagram shows the equivalent transmission when the gearbox is engaged in second gear. At this time, only the brake Z2 on the right side of the diagram is engaged, and the transmission ratio between the output shaft and the input shaft is:

[0033] i2=Z5*Z8 / (Z4*Z7)*Z17*Z19 / (Z16*Z18)*a2 / (1+a2).

[0034] Figure 4 The diagram shows the equivalent transmission when the gearbox is engaged in third gear. At this time, only the clutch L1 on the left side of the diagram is engaged, and the transmission ratio between the output shaft and the input shaft is:

[0035] i3=Z5*Z8 / (Z4*Z7)*Z11*Z13 / (Z10*Z12).

[0036] Figure 5 The diagram shows the equivalent transmission when the gearbox is engaged in fourth gear. At this time, only the brake Z1 on the left side of the diagram is engaged, and the transmission ratio between the output shaft and the input shaft is:

[0037] i4=Z5*Z8 / (Z4*Z7)*Z11*Z13 / (Z10*Z12)*a1 / (1+a1).

[0038] In addition, the input shaft 1, intermediate shaft 6, and output shaft 22 are parallel to each other, and the output shaft 22, intermediate shaft 6, and driven shaft 9 are also parallel to each other. The input shaft 1 and driven shaft 9 are coaxial. The input shaft 1 is also connected to the torque converter 2. When the input speed of the input shaft 1 is adjusted through the torque converter 2, the speed range of the entire transmission mechanism can be further expanded. For example, when the transmission ratio a1 of the first planetary gear train is 3.24 and the transmission ratio a2 of the second planetary gear train is 3.24, the transmission ratio between the driving gear 4 and the second driven gear 10 is Z5*Z8 / (Z4*Z7) = 2.1. The transmission ratios between the first output gear 13 and the second driven gear 10 are respectively:

[0039] When Z17*Z19 / (Z16*Z18)=2.42 and Z11*Z13 / (Z10*Z12)=1.35,

[0040] The transmission ratios when the gearbox is engaged in each gear can be calculated separately:

[0041] First gear: i1 = 2.1 * 2.42 = 5.08;

[0042] Second gear: i2 = 2.1 * 2.42 * 3.24 / (1 + 3.24) = 3.88;

[0043] Third gear: i3 = 2.1 * 1.35 = 2.84;

[0044] Fourth gear: i4 = 2.1 * 1.35 * 3.24 / (1 + 3.24) = 2.17;

[0045] If the torque converter adjusts the input shaft transmission ratio range to 2.45, 2.86, and 3.34 respectively, then the transmission ratios for each gear are as follows:

[0046] The torque converter has a gear ratio of 2.45: first gear: i1 = 5.49, second gear: i2 = 4.19, third gear: i3 = 3.06, and fourth gear: i4 = 2.34.

[0047] The torque converter has a gear ratio of 2.86: first gear: i1 = 6.78, second gear: i2 = 5.18, third gear: i3 = 3.78, and fourth gear: i4 = 2.89.

[0048] The torque converter has a gear ratio of 3.34: first gear: i1 = 8.08, second gear: i2 = 6.18, third gear: i3 = 4.51, and fourth gear: i4 = 3.45.

[0049] As can be seen, the total transmission ratio ranges from 2.34 to 8.08, which obviously provides a wider speed range, making the mud pump suitable for operation under more medium working conditions.

Claims

1. A speed transmission mechanism for a mud pump, comprising an input shaft (1), an intermediate shaft (6), a driven shaft (9), an output shaft (22), and a shifting device (24). The input shaft (1) is provided with a driving gear (4), the intermediate shaft (6) is provided with a first intermediate gear (5) and a double gear (25), the driven shaft (9) is provided with a second driven gear (10), and the output shaft (22) is provided with a first output gear (13). The driving gear (4) meshes with the first intermediate gear (5), and the second driven gear (10) meshes with one side of the double gear (25). The shifting device (24) includes a clutch (14), which is used to engage or disengage the other side of the double gear (25) with the first output gear (13). The end of the driven shaft (9) is also connected to an oil pump (23), which is used to extract and supply lubricating oil to the shifting device (24). The shifting device (24) also includes a brake (15), and the output shaft (22) is also provided with a sun gear (26), which meshes with planet gears (27), and the planet gears (27) also mesh with a gear ring (28). The brake (15) is used to make the gear ring (28) rotate or stop rotating. The number of planetary gears (27) is three or more; The number of the shifting devices (24) is equal to the number of the double gears (25); The double gear (25) includes a first double gear and a second double gear. The first double gear is composed of gear A (11) and gear B (12) connected together. The second double gear is composed of gear C (17) and gear D (18) connected together. The shifting device (24) is composed of clutch L1, clutch L2, brake Z1 and brake Z2. The output gear includes a first output gear (13) and a second output gear (19). The intermediate gear includes a first intermediate gear (5) and a second intermediate gear (7). The driven gear includes a first driven gear (8), a second driven gear (10) and a third driven gear (16). The sun gear (26), planet gears (27) and ring gear (28) respectively form the first planetary gear train and the second planetary gear train.

2. The mud pump speed change transmission mechanism as described in claim 1, characterized in that: The tooth ratio between the gear ring (28) and the sun gear (26) is 3.

24.

3. The mud pump speed change transmission mechanism as described in claim 1, characterized in that: The number of the shifting device (24) or double gear (25) is two.

4. The mud pump speed change transmission mechanism as described in claim 1, characterized in that: The transmission ratio between the driving gear (4) and the second driven gear (10) is 2.

1.

5. The mud pump speed change transmission mechanism as described in claim 1, characterized in that: The transmission ratio between the first output gear (13) and the second driven gear (10) is 2.42 or 1.

35.

6. The mud pump speed change transmission mechanism as described in claim 1, characterized in that: The input shaft (1), intermediate shaft (6), and output shaft (22) are parallel to each other, the output shaft (22), intermediate shaft (6), and driven shaft (9) are parallel to each other, and the input shaft (1) and driven shaft (9) are coaxial.

7. The mud pump speed change transmission mechanism as described in claim 1 or 6, characterized in that: The input shaft (1) is also connected to the torque converter (2).

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