A variable speed gear box for a drilling pump

Abstract

The utility model discloses a variable speed gear box for well drilling pump, including box, gear drive system, linkage gear shift component system, and transmission system includes setting in the first transmission shaft, second transmission shaft, third transmission shaft of box, the coaxial connection of first transmission shaft, second transmission shaft, third transmission shaft has a plurality of gear and outer spline, and the connecting path between transmission shaft is changed through the slippage of inner spline cover on gear and outer spline, and the gear box speed ratio is changed, thereby reaches the purpose of driving well drilling pump work under different rotational speed, makes it can possess the advantage that the simple change speed ratio, transmission power is reliable.

Description

Technical Field

[0001] This utility model relates to the technical field of variable speed gear transmission devices, and in particular to a variable speed gearbox for drilling pumps. Background Technology

[0002] Drilling pump gearboxes are used in the oil drilling field. Drilling pumps, also known as mud pumps, are commonly plunger pumps. They are pumps that deliver mud or flushing fluids such as water into the borehole during the drilling process. Drilling pump gearboxes are used to transmit power from the prime mover to the drilling pump and are an important component of drilling equipment.

[0003] When drilling encounters different rock formations and working conditions, the drilling pump needs to operate with different torques and speeds (generally three speeds). In the existing technology, the method of motor speed regulation is used to solve this problem. However, the motor cost of this method is too high, the speed regulation control design is complicated, and the actual torque matching is not good. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a variable speed gearbox for drilling pumps.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A variable speed gearbox for a drilling pump includes a housing, characterized in that it further includes a gear transmission system and a linkage shifting component system, wherein the transmission system includes a first transmission shaft, a second transmission shaft, and a third transmission shaft disposed within the housing;

[0007] A first gear, a second gear, and a first external spline are coaxially connected on the first transmission shaft. The first gear and the first external spline are fixedly connected to the first transmission shaft. The second gear is rotatably connected to the first transmission shaft. A second external spline is provided on the second gear. A first internal spline sleeve is fitted and connected to the first external spline and the second external spline.

[0008] A third gear, a fourth gear, a fifth gear, and a third external spline are coaxially connected on the second transmission shaft. The third gear and the third external spline are fixedly connected to the second transmission shaft, and the fourth gear and the fifth gear are rotatably connected to the second transmission shaft. A fourth external spline is provided on the fourth gear, and a second internal spline sleeve is fitted onto the third external spline and the fourth external spline.

[0009] The sixth gear and the seventh gear are coaxially fixedly connected to the third transmission shaft;

[0010] The first gear and the third gear mesh with each other; the second gear and the fifth gear mesh with each other; the fourth gear and the sixth gear mesh with each other; and the seventh gear and the fifth gear mesh with each other.

[0011] The linkage shifting component system connects the first inner spline sleeve and the second inner spline sleeve, and controls the first inner spline sleeve to move axially on the first and second outer splines, and the second inner spline sleeve to move axially on the third and fourth outer splines.

[0012] Furthermore, it also includes an eighth gear and a ninth gear. The eighth gear is rotatably connected to the second transmission shaft on the same axis, and the ninth gear is fixedly connected to the third gear on the same axis. The eighth gear and the ninth gear mesh with each other. The eighth gear is provided with a fifth external spline, and the second internal spline sleeve can move and be connected to the fifth external spline.

[0013] Furthermore, the fourth and fifth external splines are located on either side of the third external spline.

[0014] Furthermore, gaps are provided between the first and second external splines, between the third and fourth external splines, and between the fifth and third external splines, and the width of the gaps is smaller than that of the first and second inner spline sleeves.

[0015] Furthermore, the travel length of the first internal spline on the first and second external splines is equal to the travel length of the second internal spline on the fifth, third, and fourth external splines.

[0016] Furthermore, the second gear and the first drive shaft, as well as the fourth gear, the fifth gear, the eighth gear, and the second drive shaft, are all rotatably connected by bearings.

[0017] Furthermore, the first drive shaft, the second drive shaft, and the third drive shaft are parallel to each other.

[0018] Furthermore, the linkage shifting component system includes a first shift shaft, a second shift shaft, a first shift fork, and a second shift fork. The lower end of the first shift fork is fixedly connected to the first shift shaft, and the upper end is engaged with the first inner spline sleeve. The lower end of the second shift fork is fixedly connected to the second shift shaft, and the upper end is engaged with the second inner spline sleeve. When the first shift shaft and the second shift shaft rotate, they can respectively drive the first shift fork and the second shift fork to shift the first inner spline sleeve and the second inner spline sleeve.

[0019] Furthermore, the linkage shifting assembly system also includes a handle, a first shift shaft connector, a second shift shaft connector, and a linkage connector. The first shift shaft connector is fixedly connected to the outer end of the first shift shaft, the second shift shaft connector is fixedly connected to the outer end of the second shift shaft, the two ends of the linkage connector are respectively hinged to the first shift shaft connector and the second shift shaft connector, and the handle is fixedly connected to the upper end of the second shift shaft connector.

[0020] Furthermore, the first shift shaft and the second shift shaft are parallel to each other.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] A three-speed mechanical shift gearbox was developed. By using mechanical shifting, the gearbox has three speed ratios. The power transmission path is changed by adjusting the position of the internal spline sleeve, thereby changing the gearbox speed ratio and driving the drilling pump to work at different speeds. This gives it the advantages of simple speed ratio change and reliable power transmission.

[0023] This new three-speed mechanical shift gearbox has the advantages of easy speed ratio change, adaptability to the changing speed and torque requirements of drilling pumps, low overall cost, and convenient maintenance. Compared with the original speed-regulating motor, it has great application advantages.

[0024] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the internal structure of the enclosure in an embodiment.

[0026] Figure 2 This is a schematic diagram of the external side structure of the enclosure in an embodiment.

[0027] Figure 3 This is a sectional view along line AA;

[0028] Figure 4 This is a sectional view along the BB direction.

[0029] In the diagram: 1-First gear, 2-Second gear, 3-Third gear, 4-Eighth gear, 5-Fourth gear, 6-Fifth gear, 7-Ninth gear, 8-Sixth gear, 9-Seventh gear, 10-First drive shaft, 11-Second drive shaft, 12-Third drive shaft, 13-First inner spline sleeve, 14-Second inner spline sleeve, 15-First outer spline, 16-Second outer spline, 17-Third outer spline, 18-Fourth outer spline, 19-Fifth outer spline, 20-First shift shaft, 21-Second shift shaft, 22-First shift fork, 23-Second shift fork, 24-Handle, 25-First shift shaft connector, 26-Second shift shaft connector, 27-Linkage connector, 28-Box housing. Detailed Implementation

[0030] To enhance understanding of this utility model, we will now describe it in further detail with reference to the accompanying drawings. This embodiment is only used to explain this utility model and does not constitute a limitation on the scope of protection of this utility model.

[0031] like Figure 1-4 As shown, a specific embodiment of a variable speed gearbox for a drilling pump includes a housing, a gear transmission system, and a linkage shifting component system.

[0032] The transmission system includes a first drive shaft 10, a second drive shaft 11, and a third drive shaft 12, which are installed inside the housing 28.

[0033] like Figure 1 As shown, a first gear 1, a second gear 2, and a first external spline 15 are coaxially connected to the first drive shaft 10. The first gear 1 and the first external spline 15 are fixedly connected to the first drive shaft 10. The second gear 2 is rotatably connected to the first drive shaft 10. A second external spline 16 is provided on the second gear 2. A first internal spline sleeve 13 is connected to the first external spline 15 and the second external spline 16.

[0034] The third gear 3, the fourth gear 5, the fifth gear 6, the eighth gear 4, and the third external spline 17 are coaxially connected to the second drive shaft 11. The third gear 3 and the third external spline 17 are fixedly connected to the second drive shaft 11. The fourth gear 5, the fifth gear 6, and the eighth gear 4 are rotatably connected to the second drive shaft 11. The fourth gear 5 is provided with a fourth external spline 18, and the eighth gear 4 is provided with a fifth external spline 19. The second internal spline sleeve 14 is fitted and connected to the third external spline 17, the fourth external spline 19, and the fifth external spline 19.

[0035] The sixth gear 8, the seventh gear 9, and the ninth gear 7 are coaxially fixedly connected to the third drive shaft 12.

[0036] The first gear 1 and the third gear 3 mesh with each other; the second gear 2 and the fifth gear 6 mesh with each other; the fourth gear 5 and the sixth gear 8 mesh with each other; the seventh gear 9 and the fifth gear 6 mesh with each other; and the eighth gear 4 and the ninth gear 7 mesh with each other.

[0037] The first inner spline sleeve 13 moves axially along the first outer spline 15 and the second outer spline 16, while the second inner spline sleeve 14 moves axially along the fifth outer spline 19, the third outer spline 17, and the fourth outer spline 18.

[0038] like Figure 1 As shown, the first external spline 15 and the second external spline 16 are arranged sequentially from top to bottom, and the fifth external spline 19, the third external spline 17, and the fourth external spline 18 are arranged sequentially from top to bottom. Gaps are provided between the first external spline 15 and the second external spline 16, between the third external spline 17 and the fourth external spline 18, and between the fifth external spline 19 and the third external spline 17. The width of these gaps is smaller than that of the first inner spline sleeve 13 and the second inner spline sleeve 17.

[0039] Preferably, the travel length of the first inner spline sleeve 13 on the first outer spline 15 and the second outer spline 16 is equal to the travel length of the second inner spline sleeve 14 on the fifth outer spline 19, the third outer spline 17, and the fourth outer spline 18.

[0040] Preferably, the second gear 2 and the first drive shaft 10, as well as the fourth gear 5, the fifth gear 6, the eighth gear 4 and the second drive shaft 11, are all rotatably connected by bearings.

[0041] Preferably, the first drive shaft 10, the second drive shaft 11, and the third drive shaft 12 are arranged in parallel to each other.

[0042] like Figure 2-4 As shown, the linkage shifting assembly system includes a first shift shaft 20, a second shift shaft 21, a first shift fork 22, and a second shift fork 23. The lower end of the first shift fork 22 is fixedly connected to the first shift shaft 20, and the upper end is engaged with the first inner spline sleeve 13. The lower end of the second shift fork 23 is fixedly connected to the second shift shaft 21, and the upper end is engaged with the second inner spline sleeve 14. When the first shift shaft 20 and the second shift shaft 21 rotate, they can respectively drive the first shift fork 22 and the second shift fork 23 to shift the first inner spline sleeve 13 and the second inner spline sleeve 14.

[0043] Preferably, the linkage shifting assembly system further includes a handle 24, a first shift shaft connector 25, a second shift shaft connector 26, and a linkage connector 27. The first shift shaft connector 25 is fixedly connected to the outer end of the first shift shaft 20, the second shift shaft connector 26 is fixedly connected to the outer end of the second shift shaft 21, and the two ends of the linkage connector 27 are respectively hinged to the first shift shaft connector 25 and the second shift shaft connector 26. The handle 24 is fixedly connected to the upper end of the second shift shaft connector 26. The first shift shaft 20 and the second shift shaft 21 are parallel to each other.

[0044] The working principle of the above embodiments is as follows:

[0045] When the handle 24 is turned, the second shift shaft connector 26 drives the second shift shaft 21 to rotate; simultaneously, the linkage connector 27 sequentially drives the first shift shaft connector 25 and the first shift shaft 20 to rotate. The upper ends of the first shift fork 22 and the second shift fork 23 connected to the first shift shaft 20 and the second shift shaft 21 swing back and forth, simultaneously moving the first inner spline sleeve 13 and the second inner spline sleeve 14 along the drive shaft axis to form a linkage. The first inner spline sleeve 13 then slides on the first outer spline 15 and the second outer spline 16. At this time, the second inner spline sleeve 14, which is linked with the first inner spline sleeve 13, will slide on the fifth outer spline 19, the third outer spline 17, and the fourth outer spline 18.

[0046] When the first internal spline sleeve 13 is fully engaged on the second external spline 16 of the second gear 2, the second internal spline sleeve 14 is partially engaged on the fourth external spline 18 of the fourth gear 5 and partially engaged on the third external spline 17 of the second drive shaft 11. In other words, the second internal spline sleeve 14 connects the fourth gear 5 and the second drive shaft 11, while the second internal spline sleeve 13 does not serve a connecting function. At this time, the power flow input from the first drive shaft 10 is transmitted along the path of the first drive shaft 10, the first gear 1, the third gear 3, the second drive shaft 11, the fourth gear 5, the sixth gear 8, and the third drive shaft 12. The gear ratio of the gearbox is i1 = (Z3 / Z1)·(Z6 / Z4), where Z3, Z1, Z6, and Z4 are the number of teeth of the third gear 3, the first gear 1, the sixth gear 8, and the fourth gear 5, respectively.

[0047] Continue turning the handle 24. When half of the first inner spline sleeve 13 is on the second outer spline 16 of the second gear 2 and half is on the first outer spline 15 of the first drive shaft 10, the second inner spline sleeve 14 is completely on the third outer spline 17 of the second drive shaft 11. That is, the first inner spline sleeve 13 connects the second gear 2 and the first drive shaft 10, while the second inner spline sleeve 14 does not play a connecting role. At this time, the power flow input from the first drive shaft 10 will be transmitted along the path of the first drive shaft 10, the second gear 2, the fifth gear 6, the seventh gear 9, and the third drive shaft 12. The gear ratio of the gearbox is i2 = (Z5 / Z2)·(Z7 / Z5), where Z5, Z2, and Z7 are the number of teeth of the fifth gear 6, the second gear 2, and the seventh gear 9, respectively.

[0048] Continue turning the handle 24. When the first inner spline sleeve 13 is fully engaged on the first outer spline 15 of the first drive shaft 10, the second inner spline sleeve 14 is half engaged on the third outer spline 17 of the second drive shaft 11 and half engaged on the fifth outer spline 19 of the eighth gear 4. That is, the second inner spline sleeve 14 connects the eighth gear 4 and the second drive shaft 11, while the first inner spline sleeve 13 does not play a connecting role. At this time, the power flow input from the first drive shaft 10 will be transmitted along the path of the first drive shaft 10, the first gear 1, the third gear 3, the second drive shaft 11, the eighth gear 4, the ninth gear 7, and the third drive shaft 12. The gear ratio of the gearbox is i3 = (Z3 / Z1)·(Z9 / Z8), where Z3, Z1, Z9, and Z8 are the number of teeth of the third gear 3, the first gear 1, the ninth gear 7, and the eighth gear 4, respectively.

[0049] This embodiment employs different gear ratios to create a three-speed mechanical shift gearbox. It offers advantages such as convenient speed ratio changes, adaptability to varying speed and torque requirements of the drilling pump, low overall cost, and easy maintenance. Compared to existing systems using variable-speed motors, it provides significant application advantages. The engagement and disengagement of the splines are achieved by pushing the shift fork, thereby changing the power transmission path and thus altering the speed.

[0050] The above specific embodiments are only for illustrating the technical concept and structural features of this utility model, and are intended to enable those skilled in the art to implement them. However, the above content does not limit the protection scope of this utility model. Any equivalent changes or modifications made in accordance with the spirit and essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A variable speed gearbox for a drilling pump, comprising a housing (28), characterized in that: It also includes a gear transmission system and a linkage shifting component system. The transmission system includes a first transmission shaft (10), a second transmission shaft (11), and a third transmission shaft (12) disposed in the housing (28). A first gear (1), a second gear (2), and a first external spline (15) are coaxially connected on the first transmission shaft (10). The first gear (1) and the first external spline (15) are fixedly connected to the first transmission shaft (10). The second gear (2) is rotatably connected to the first transmission shaft (10). A second external spline (16) is provided on the second gear (2). A first internal spline sleeve (13) is connected to the first external spline (15) and the second external spline (16). A third gear (3), a fourth gear (5), a fifth gear (6), and a third external spline (17) are coaxially connected on the second transmission shaft (11). The third gear (3) and the third external spline (17) are fixedly connected to the second transmission shaft (11), and the fourth gear (5) and the fifth gear (6) are rotatably connected to the second transmission shaft (11). A fourth external spline (18) is provided on the fourth gear (5), and a second internal spline sleeve (14) is fitted on the third external spline (17) and the fourth external spline (18). The sixth gear (8) and the seventh gear (9) are coaxially fixedly connected to the third transmission shaft (12). The first gear (1) and the third gear (3) mesh with each other, the second gear (2) and the fifth gear (6) mesh with each other, the fourth gear (5) and the sixth gear (8) mesh with each other, and the seventh gear (9) and the fifth gear (6) mesh with each other; The linkage shifting component system connects the first inner spline sleeve (13) and the second inner spline sleeve (14), and controls the first inner spline sleeve (13) to move axially on the first outer spline (15) and the second outer spline (16), and the second inner spline sleeve (14) to move axially on the third outer spline (17) and the fourth outer spline (18).

2. The gearbox for drilling pumps according to claim 1, characterized in that: It also includes an eighth gear (4) and a ninth gear (7). The eighth gear (4) is rotatably connected to the second transmission shaft (11) on the same axis. The ninth gear (7) is fixedly connected to the third gear (3) on the same axis. The eighth gear (4) and the ninth gear (7) mesh with each other. The eighth gear (4) is provided with a fifth external spline (19). The second internal spline sleeve (14) can move and be connected to the fifth external spline (19).

3. The gearbox for a drilling pump according to claim 2, characterized in that: The fourth external spline (18) and the fifth external spline (19) are located on both sides of the third external spline (17).

4. The gearbox for a drilling pump according to claim 3, characterized in that: A gap is provided between the first external spline (15) and the second external spline (16), between the third external spline (17) and the fourth external spline (18), and between the fifth external spline (19) and the third external spline (17), and the width of the gap is smaller than that between the first inner spline sleeve (13) and the second inner spline sleeve (14).

5. A speed-changing gearbox for a drilling pump according to claim 4, characterized in that: The travel length of the first inner spline sleeve (13) on the first outer spline (15) and the second outer spline (16) is equal to the travel length of the second inner spline sleeve (14) on the fifth outer spline (19), the third outer spline (17), and the fourth outer spline (18).

6. A speed-changing gearbox for a drilling pump according to claim 2, characterized in that: The second gear (2) and the first drive shaft (10), as well as the fourth gear (5), the fifth gear (6), the eighth gear (4) and the second drive shaft (11), are all rotatably connected by bearings.

7. The gearbox for a drilling pump according to claim 1, characterized in that: The first drive shaft (10), the second drive shaft (11), and the third drive shaft (12) are parallel to each other.

8. The gearbox for a drilling pump according to claim 1, characterized in that: The linkage shifting component system includes a first shifting shaft (20), a second shifting shaft (21), a first shift fork (22), and a second shift fork (23). The lower end of the first shift fork (22) is fixedly connected to the first shifting shaft (20), and the upper end is engaged with the first inner spline sleeve (13). The lower end of the second shift fork (23) is fixedly connected to the second shifting shaft (21), and the upper end is engaged with the second inner spline sleeve (14). When the first shifting shaft (20) and the second shifting shaft (21) rotate, they can respectively drive the first shift fork (22) and the second shift fork (23) to shift the first inner spline sleeve (13) and the second inner spline sleeve (14).

9. A speed-changing gearbox for a drilling pump according to claim 8, characterized in that: The linkage shifting component system also includes a handle (24), a first shift shaft connector (25), a second shift shaft connector (26), and a linkage connector (27). The first shift shaft connector (25) is fixedly connected to the outer end of the first shift shaft (20), the second shift shaft connector (26) is fixedly connected to the outer end of the second shift shaft (21), and the two ends of the linkage connector (27) are respectively hinged to the first shift shaft connector (25) and the second shift shaft connector (26). The handle (24) is fixedly connected to the upper end of the second shift shaft connector (26).

10. A speed-changing gearbox for a drilling pump according to claim 8, characterized in that: The first shift shaft (20) and the second shift shaft (21) are parallel to each other.

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