Downhole speed reducer
By employing a planetary gear reduction mechanism and an annular sliding sleeve piston combination in the downhole reducer, the pressure balance inside and outside the sealing cavity is achieved, solving the problem of poor sealing performance of the downhole reducer and improving the working performance and reliability of the equipment.
Patent Information
- Application Number
- CN202423213575.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-11-18
- Estimated Expiration
- 2034-12-25
AI Technical Summary
Existing speed reducers face challenges in downhole applications due to poor sealing performance, inability to balance internal and external pressure differences, resulting in lubricant contamination and component wear, making it difficult to guarantee long-term stable operation.
A downhole reducer was designed, which uses a planetary gear reduction mechanism located inside the sealed cavity. The automatic balance of pressure inside and outside the sealed cavity is achieved through the combination of the first and second annular sleeves, piston and spring. Lubricating oil is used to ensure sealing performance, and bearings and oil injection holes are provided for easy maintenance.
It improves the performance and reliability of the reducer in harsh underground environments, ensures internal cleanliness and sealing performance, and extends the service life of the equipment.
Smart Images
Figure CN223563417U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of speed reducer, especially to a downhole speed reducer. BACKGROUND
[0002] In the field of modern industrial production and mining, as an important component of mechanical equipment, speed reducers are widely used in various occasions where speed reduction and torque increase are required. Especially in the underground working environment, the speed reducer not only has to withstand harsh working conditions, but also has to ensure long-term stable operation. However, the existing speed reducer faces many challenges in underground application.
[0003] In the underground environment, there is a large amount of dust and moisture, and the external pressure is high, which puts higher requirements on the sealing performance of the speed reducer. At the same time, due to the high temperature in the well, the pressure of the lubricating oil in the speed reducer will also increase. The sealing structure of the traditional speed reducer is relatively simple. When the external pressure is greater than the internal pressure of the speed reducer, the external contaminants can easily enter the interior of the speed reducer, causing problems such as contamination of the lubricating oil and accelerated wear of the parts. When the internal pressure of the speed reducer is greater than the external pressure, the lubricating oil in the interior of the speed reducer can easily seep out to the exterior. The existing speed reducer cannot balance the pressure difference between the interior and exterior of the speed reducer, and has poor reliability, making it difficult to ensure the working performance of the speed reducer. SUMMARY
[0004] The utility model aims at least solve the technical problems existing in the prior art. For this purpose, the utility model provides a downhole speed reducer, which improves the working performance and reliability of the speed reducer in the harsh underground environment, can balance the pressure difference between the interior and exterior of the speed reducer, has good sealing performance, and ensures the cleanliness of the interior of the speed reducer.
[0005] According to some embodiments of the utility model, a downhole speed reducer comprises a shell, input shafts and output shafts are arranged at both ends of the shell, a planetary gear reducer mechanism is arranged between the input shafts and the output shafts, the input shafts are connected with the input end of the planetary gear reducer, the output shafts are connected with the output end of the planetary gear reducer mechanism, a sealing cavity is arranged in the interior of the shell, the planetary gear reducer mechanism is located in the sealing cavity, first annular sliding sleeves and second annular sliding sleeves are arranged at both ends of the sealing cavity, first pistons are sealingly connected in the first annular sliding sleeves by sliding, first springs are arranged in the first annular sliding sleeves in the axial direction, the first springs are connected with the first pistons, the input shafts pass through the middle part of the first pistons, second pistons are sealingly connected in the second annular sliding sleeves by sliding, second springs are arranged in the second annular sliding sleeves in the axial direction, the second springs are connected with the second pistons, and the output shafts pass through the middle part of the second pistons.
[0006] The underground speed reducer has at least the following beneficial effects according to some embodiments of the utility model:
[0007] The utility model discloses a output shaft and the output end connection of planetary gear reduction mechanism, the inside of casing is provided sealed cavity, and the planetary gear reduction mechanism is located in sealed cavity, and injects lubricating oil in sealed cavity before use, guarantees the performance of speed reducer, simultaneously through setting up first annular slide sleeve and second annular slide sleeve, the first piston is sealedly connected with sliding in first annular slide sleeve, and first spring is arranged in the first annular slide sleeve along the axial direction, and first spring is connected with first piston, and the middle part of first piston is worn by input shaft, and the second piston is sealedly connected with sliding in second annular slide sleeve, and second spring is arranged in the second annular slide sleeve along the axial direction, and second spring is connected with second piston, and the middle part of second piston is worn by output shaft, when sealed cavity and the pressure difference of casing outside are produced, first piston and second piston will move in first annular slide sleeve and second annular slide sleeve respectively, and the space of sealed cavity is compressed or enlarged, and then the pressure in sealed cavity is promoted or reduced, until the pressure difference of inside and outside of speed reducer reaches balance, the utility model discloses improves the working performance and reliability of speed reducer in the harsh environment of well, can balance the pressure difference of inside and outside of speed reducer, and the sealing performance is good, guarantees the cleanliness of speed reducer inside.
[0008] The utility model discloses a underground speed reducer according to some embodiments of the utility model, one end inner wall of first annular slide sleeve is provided with first connecting block, and both ends of first spring are connected with first connecting block and first piston respectively.
[0009] The utility model discloses a underground speed reducer according to some embodiments of the utility model, one end of input shaft is provided with step part near planetary gear reduction mechanism, and step part is located one side of first annular slide sleeve near planetary gear reduction mechanism, and first piston is located between step part and first connecting block.
[0010] The utility model discloses a underground speed reducer according to some embodiments of the utility model, one end inner wall of second annular slide sleeve is provided with second connecting block, and both ends of second spring are connected with second connecting block and second piston respectively.
[0011] The utility model discloses a underground speed reducer according to some embodiments of the utility model, be provided with snap spring on output shaft, and snap spring is located one end of second annular slide sleeve away from second connecting block, and second piston is located between snap spring and second connecting block.
[0012] The utility model discloses a underground speed reducer according to some embodiments of the utility model, be provided with abutting plate with sliding in second annular slide sleeve, and abutting plate is located between second spring and second piston, and second spring is connected with abutting plate.
[0013] The underground speed reducer according to some embodiments of the present application, the inner wall of the shell is provided with a first bearing and a second bearing, the input shaft is arranged in the first bearing, the output shaft is arranged in the second bearing, and the first bearing and the second bearing are located in the sealing cavity.
[0014] The underground speed reducer according to some embodiments of the present application, the shell comprises a first shell, a second shell and a third shell connected in sequence, the first bearing is arranged on the inner wall of the first shell, the planetary gear speed reduction mechanism is located in the second shell, and the second bearing is arranged on the inner wall of the third shell.
[0015] The underground speed reducer according to some embodiments of the present application, the planetary gear speed reduction mechanism comprises a driving wheel, three planetary wheels and a gear ring, the middle part of the input shaft is connected with the driving wheel, the three planetary wheels are equidistantly distributed on the outer periphery of the driving wheel, the gear ring is sleeved on the outer periphery of the three planetary gears, the driving wheel is engaged with the three planetary wheels, the three planetary wheels are engaged with the gear ring, the middle parts of the three planetary wheels are rotatably connected with the output shaft, and the gear ring is arranged on the inner wall of the shell.
[0016] The underground speed reducer according to some embodiments of the present application, an oil injection hole is formed in the shell, and the oil injection hole is communicated with the sealing cavity.
[0017] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS
[0018] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings.
[0019] Fig. 1 The structure of the embodiment of the present application is shown in the figure.
[0020] Fig. 2 The cross-sectional view of the embodiment of the present application is shown in the figure.
[0021] Fig. 3 The cross-sectional view of the planetary gear speed reduction mechanism of the embodiment of the present application is shown in the figure.
[0022] Label: 1, housing, 2, input shaft, 3, output shaft, 4, planetary gear reduction mechanism, 5, sealed cavity, 6, first annular sliding sleeve, 7, second annular sliding sleeve, 8, first piston, 9, first spring, 10, second piston, 11, second spring, 12, first connecting block, 13, step portion, 14, second connecting block, 15, snap spring, 16, abutment plate, 17, first bearing, 18, second bearing, 19, first housing, 20, second housing, 21, third housing, 22, driving wheel, 23, planetary gear, 24, gear ring, 25, oil injection hole. DETAILED DESCRIPTION
[0023] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation of the present application.
[0024] In the description of the present application, it should be understood that, if the orientation description, such as up, down, left, right, front, back and the like, is described, the orientation or position relationship shown in the drawings is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the modules or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.
[0025] In the description of the present application, if the first, second, etc. are described for the purpose of distinguishing technical features, they cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the sequence of technical features indicated.
[0026] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.
[0027] As shown in Figs. 1-3 The embodiment of the present application provides a downhole speed reducer.
[0028] The utility model provides a kind of downhole speed reducer, including shell 1, the input shaft 2 and output shaft 3 are arranged respectively in both ends of the shell 1, and planetary gear reducer mechanism 4 is arranged between the input shaft 2 and the output shaft 3, the input shaft 2 is connected with the input end of the planetary gear reducer 4, and the output shaft 3 is connected with the output end of the planetary gear reducer mechanism 4, the inside of the shell 1 is provided with sealed cavity 5, and the planetary gear reducer mechanism 4 is located in the sealed cavity 5, and the first annular sliding sleeve 6 and the second annular sliding sleeve 7 are arranged respectively in both ends of the sealed cavity 5, the first piston 8 is slidably and sealingly connected in the first annular sliding sleeve 6, the first spring 9 is arranged in the first annular sliding sleeve 6 along the axial direction, the first spring 9 is connected with the first piston 8, the input shaft 2 is arranged in the middle of the first piston 8, the second piston 10 is slidably and sealingly connected in the second annular sliding sleeve 7, the second spring 11 is arranged in the second annular sliding sleeve 7 along the axial direction, the second spring 11 is connected with the second piston 10, and the output shaft 3 is arranged in the middle of the second piston 10.
[0029] The utility model discloses a kind of downhole speed reducer, including shell 1, the input shaft 2 and output shaft 3 are arranged respectively in both ends of the shell 1, and planetary gear reducer mechanism 4 is arranged between the input shaft 2 and the output shaft 3, the input shaft 2 is connected with the input end of the planetary gear reducer 4, and the output shaft 3 is connected with the output end of the planetary gear reducer mechanism 4, the inside of the shell 1 is provided with sealed cavity 5, and the planetary gear reducer mechanism 4 is located in the sealed cavity 5, and the first annular sliding sleeve 6 and the second annular sliding sleeve 7 are arranged respectively in both ends of the sealed cavity 5, the first piston 8 is slidably and sealingly connected in the first annular sliding sleeve 6, the first spring 9 is arranged in the first annular sliding sleeve 6 along the axial direction, the first spring 9 is connected with the first piston 8, the input shaft 2 is arranged in the middle of the first piston 8, the second piston 10 is slidably and sealingly connected in the second annular sliding sleeve 7, the second spring 11 is arranged in the second annular sliding sleeve 7 along the axial direction, the second spring 11 is connected with the second piston 10, and the output shaft 3 is arranged in the middle of the second piston 10, when pressure difference is generated between sealed cavity 5 and the outside of shell 1, the first piston 8 and the second piston 10 will move respectively in the first annular sliding sleeve 6 and the second annular sliding sleeve 7, compress or amplify the space of sealed cavity 5, to let the pressure in sealed cavity 5 promote or reduce, until the pressure difference inside and outside the speed reducer reaches balance, the utility model improves the working performance and reliability of the speed reducer in the downhole harsh environment, can balance the pressure difference inside and outside the speed reducer, and has good sealing performance, guarantees the cleanliness inside the speed reducer.
[0030] The utility model discloses a kind of downhole speed reducer, and the first annular sliding sleeve 6 is provided with first connecting block 12 on the inner wall of one end, and the both ends of the first spring 9 are connected with the first connecting block 12 and the first piston 8 respectively. Specifically, by setting first connecting block 12 on the inner wall of one end of first annular sliding sleeve 6, and the both ends of first spring 9 are connected with first connecting block 12 and first piston 8 respectively, the axial support of first spring 9 to first piston 8 can be ensured, and good sealing performance is maintained.
[0031] The input shaft 2 is provided with a stepped portion 13 near one end of the planetary gear reduction mechanism 4, the stepped portion 13 is located on the side of the first annular sliding sleeve 6 close to the planetary gear reduction mechanism 4, and the first piston 8 is located between the stepped portion 13 and the first connecting block 12. Specifically, by providing the stepped portion 13 at one end of the input shaft 2 close to the planetary gear reduction mechanism 4, and placing the first piston 8 between the stepped portion 13 and the first connecting block 12, the maximum displacement of the first piston 8 can be limited by the stepped portion 13, preventing over-displacement of the piston from causing sealing failure, and also helping to improve the axial positioning accuracy of the input shaft 2.
[0032] The second annular sliding sleeve 7 is provided with a second connecting block 14 on the inner wall of one end, and the two ends of the second spring 11 are connected with the second connecting block 14 and the second piston 10 respectively. Specifically, by providing the second connecting block 14 on the inner wall of one end of the second annular sliding sleeve 7, and connecting the two ends of the second spring 11 with the second connecting block 14 and the second piston 10 respectively, the axial support of the second spring 11 on the second piston 10 can be ensured, and good sealing performance can be maintained.
[0033] The output shaft 3 is provided with a snap spring 15, the snap spring 15 is located at one end of the second annular sliding sleeve 7 away from the second connecting block 14, and the second piston 10 is located between the snap spring 15 and the second connecting block 14. Specifically, by providing the snap spring 15 on the output shaft 3 and placing it at one end of the second annular sliding sleeve 7 away from the second connecting block 14, and limiting the second piston 10 between the snap spring 15 and the second connecting block 14, the maximum displacement of the second piston 10 can be limited by the snap spring 15, preventing over-displacement of the piston from causing sealing failure, and also helping to improve the axial positioning accuracy of the output shaft 3.
[0034] The second annular sliding sleeve 7 is provided with an abutting plate 16 slidingly arranged inside, the abutting plate 16 is located between the second spring 11 and the second piston 10, and the second spring 11 is connected with the abutting plate 16. Specifically, since one end of the output shaft 3 is more susceptible to external sand and water vapor intrusion in actual work, by providing the abutting plate 16 inside the second annular sliding sleeve 7 and placing it between the second spring 11 and the second piston 10, the contact stability between the second piston 10 and the second spring 11 can be further enhanced, the stability of the second piston 10 during sliding can be ensured, and the sealing effect can be improved.
[0035] The underground speed reducer provided by the embodiment comprises a shell 1, an input shaft 2, a planetary gear speed reduction mechanism 4, an output shaft 3 and a sealing cavity 5. The first bearing 17 and the second bearing 18 are arranged on the inner wall of the shell 1. The input shaft 2 penetrates through the first bearing 17, and the output shaft 3 penetrates through the second bearing 18. The first bearing 17 and the second bearing 18 are both located in the sealing cavity 5. Specifically, the first bearing 17 and the second bearing 18 are arranged on the inner wall of the shell 1, and the input shaft 2 and the output shaft 3 are respectively arranged to penetrate through the two bearings. When the input shaft 2 and the output shaft 3 rotate, good radial support can be provided, the radial runout of the shaft is reduced, and the rotation stability and the service life of the bearing are improved. It can be understood that in some embodiments, the first bearing 17 and the second bearing 18 are both arranged in parallel with two.
[0036] The underground speed reducer provided by the embodiment comprises a shell 1, an input shaft 2, a planetary gear speed reduction mechanism 4, an output shaft 3 and a sealing cavity 5. The first bearing 17 and the second bearing 18 are arranged on the inner wall of the shell 1. The input shaft 2 penetrates through the first bearing 17, and the output shaft 3 penetrates through the second bearing 18. The first bearing 17 and the second bearing 18 are both located in the sealing cavity 5. Specifically, the first bearing 17 and the second bearing 18 are arranged on the inner wall of the shell 1, and the input shaft 2 and the output shaft 3 are respectively arranged to penetrate through the two bearings. When the input shaft 2 and the output shaft 3 rotate, good radial support can be provided, the radial runout of the shaft is reduced, and the rotation stability and the service life of the bearing are improved. It can be understood that in some embodiments, the first bearing 17 and the second bearing 18 are both arranged in parallel with two.
[0037] The underground speed reducer provided by the embodiment comprises a shell 1, an input shaft 2, a planetary gear speed reduction mechanism 4, an output shaft 3 and a sealing cavity 5. The first bearing 17 and the second bearing 18 are arranged on the inner wall of the shell 1. The input shaft 2 penetrates through the first bearing 17, and the output shaft 3 penetrates through the second bearing 18. The first bearing 17 and the second bearing 18 are both located in the sealing cavity 5. Specifically, the first bearing 17 and the second bearing 18 are arranged on the inner wall of the shell 1, and the input shaft 2 and the output shaft 3 are respectively arranged to penetrate through the two bearings. When the input shaft 2 and the output shaft 3 rotate, good radial support can be provided, the radial runout of the shaft is reduced, and the rotation stability and the service life of the bearing are improved. It can be understood that in some embodiments, the first bearing 17 and the second bearing 18 are both arranged in parallel with two.
[0038] It can be understood that the components inside the speed reducer that need to be infiltrated by lubricating oil are the first bearing 17, the second bearing 18 and the planetary gear reduction mechanism 4, the first bearing 17, the second bearing 18 and the planetary gear reduction mechanism 4 are all arranged in the sealed cavity 5, the first bearing 17 and the second bearing 18 have gaps between the balls, and the planetary gear reduction mechanism 4 has gaps between the planetary gears 23, so that the lubricating oil inside can flow in the sealed cavity 5, and the first bearing 17, the second bearing 18 and the planetary gear reduction mechanism 4 can be infiltrated at the same time, and the structure of the utility model is ingenious, and the components that need to be lubricated can work stably.
[0039] The shell 1 is provided with an oil injection hole 25, and the oil injection hole 25 is communicated with the sealed cavity 5.
[0040] Although the embodiments of the utility model have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.
Claims
1. A downhole speed reducer, characterized by: The utility model provides a kind of planetary gear reduction mechanism, including shell, the two ends of the shell are respectively provided with input shaft and output shaft, input shaft and output shaft are provided with planetary gear reduction mechanism between, input shaft is connected with the input end of planetary gear reduction mechanism, output shaft is connected with the output end of planetary gear reduction mechanism, the inside of the shell is provided with sealed cavity, planetary gear reduction mechanism is located in sealed cavity, the two ends of the sealed cavity are respectively provided with first annular slide sleeve and second annular slide sleeve, first annular slide sleeve is slidably connected with first piston in, first annular slide sleeve is provided with first spring along the axis in, first spring is connected with first piston, input shaft is arranged in the middle part of first piston, second annular slide sleeve is slidably connected with second piston, second annular slide sleeve is provided with second spring along the axis, second spring is connected with second piston, output shaft is arranged in the middle part of second piston.
2. A downhole speed reducer according to claim 1, characterized in that: The inner wall of one end of the first annular slide sleeve is protrudingly provided with a first connecting block, and the two ends of the first spring are respectively connected with the first connecting block and the first piston.
3. A downhole speed reducer according to claim 2, characterized in that: The end of the input shaft close to the planetary gear reduction mechanism is provided with a stepped portion, the stepped portion is located on the side of the first annular slide sleeve close to the planetary gear reduction mechanism, and the first piston is located between the stepped portion and the first connecting block.
4. A downhole speed reducer according to claim 1, characterized in that: The inner wall of one end of the second annular slide sleeve is protrudingly provided with a second connecting block, and the two ends of the second spring are respectively connected with the second connecting block and the second piston.
5. A downhole speed reducer according to claim 4, characterized in that: The output shaft is provided with a clamping spring, the clamping spring is located at the end of the second annular slide sleeve away from the second connecting block, and the second piston is located between the clamping spring and the second connecting block.
6. A downhole speed reducer according to claim 5, characterized in that: A contact plate is slidably arranged in the second annular slide sleeve, the contact plate is located between the second spring and the second piston, and the second spring is connected with the contact plate.
7. A downhole speed reducer according to claim 1, characterized in that: The inner wall of the shell is provided with a first bearing and a second bearing, the input shaft is arranged in the first bearing, the output shaft is arranged in the second bearing, and the first bearing and the second bearing are located in the sealed cavity.
8. A downhole speed reducer according to claim 7, characterized by: The shell comprises a first shell, a second shell and a third shell connected in sequence, the first bearing is arranged on the inner wall of the first shell, the planetary gear reduction mechanism is located in the second shell, and the second bearing is arranged on the inner wall of the third shell.
9. A downhole speed reducer according to claim 1, characterized in that: The planetary gear reduction mechanism comprises a driving wheel, three planetary wheels and a gear ring, the middle part of the input shaft is connected with the driving wheel, the three planetary wheels are equidistantly distributed on the outer periphery of the driving wheel, the gear ring is sleeved on the outer periphery of the three planetary wheels, the driving wheel is engaged with the three planetary wheels, the three planetary wheels are all engaged with the gear ring, the middle parts of the three planetary wheels are rotatably connected with the output shaft, and the gear ring is arranged on the inner wall of the shell.
10. A downhole speed reducer according to claim 1, characterized in that: An oil injection hole is formed in the shell, and the oil injection hole is communicated with the sealed cavity.