CN215486568U - Flexible shaft for connecting electric submersible screw pump and driving assembly - Google Patents
Flexible shaft for connecting electric submersible screw pump and driving assembly Download PDFInfo
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- CN215486568U CN215486568U CN202121396671.6U CN202121396671U CN215486568U CN 215486568 U CN215486568 U CN 215486568U CN 202121396671 U CN202121396671 U CN 202121396671U CN 215486568 U CN215486568 U CN 215486568U
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- base
- screw pump
- transmission shaft
- electric submersible
- spline housing
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Abstract
The utility model relates to a flexible shaft for connecting an electric submersible screw pump and a driving assembly, which comprises a shell, a base, a liquid inlet, a transmission shaft, a lower spline sleeve, an upper spline sleeve, a radial bearing and a head seat, and is characterized in that: the lower portion of the shell is connected with the base, the upper portion of the shell is connected with the head seat, a liquid inlet is formed in the base, the transmission shaft is arranged in the shell, the upper end of the transmission shaft is connected with the upper spline sleeve, the lower end of the transmission shaft is connected with the lower spline sleeve, a radial bearing is arranged between the lower spline sleeve and the base, and the lower spline sleeve, the transmission shaft, the upper spline sleeve and the annular space of the shell are fluid channels. The utility model can be used in an oil well with overlarge inclination, reduces the damage to a concentric movement driving assembly caused by the eccentric movement of the screw pump rotor, has higher power transmission efficiency and cannot be influenced by gravity.
Description
Technical Field
The utility model relates to oil extraction equipment, in particular to a flexible shaft for connecting an electric submersible screw pump and a driving assembly.
Background
The electric submersible screw pump system directly connects the motor, the reducer, the protector and the screw pump with each other to finally realize the purpose of rotating the rotor to realize oil extraction.
The motion of the rotor of the screw pump in the stator is eccentric motion, and the motion track of the circle center of the rotor changes along with the change of the screw shape of the screw pump. The motor, the speed reducer and the protector in the electric submersible screw pump system move concentrically. When the protector is connected with the electric submersible screw pump, a flexible shaft is required to be added so as to reduce damage to a concentrically moving driving assembly caused by eccentric motion of a rotor of the screw pump.
Currently available flexible shafts are gimbal connection mechanisms. The disadvantage of the universal joint connection is that the power loss is large, and when a highly deviated well is encountered, the long shaft of the universal joint mechanism falls downwards due to gravity. When rotational power is given, the long shaft bends downward due to gravity, and power loss occurs.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problems, the utility model adopts the long transmission shaft to transmit power, and the transmission shaft, the headstock and the base are supported by the radial bearing, so that the power transmission efficiency is higher, and the influence of gravity cannot be caused. The utility model is realized by the following technical scheme:
the utility model provides a connect electric submersible screw pump and drive assembly's flexible shaft, includes casing, base, inlet, transmission shaft, lower spline housing, goes up spline housing, journal bearing and headstock, characterized in that: the lower portion of the shell is connected with the base, the upper portion of the shell is connected with the head seat, the liquid inlet is formed in the base, the transmission shaft is arranged in the shell, a spline is arranged at the upper end of the transmission shaft and connected with the upper spline sleeve, a spline is arranged at the lower end of the transmission shaft and connected with the lower spline sleeve, the lower end of the lower spline sleeve extends into the interior of the base, a radial bearing is arranged between the lower spline sleeve and the base, and the lower spline sleeve, the transmission shaft, the upper spline sleeve and the annular space of the shell are fluid channels.
The number of the radial bearings is 2.
The liquid inlets are 3 and are arranged on the base on the upper side of the radial bearing.
The lower end of the head seat is provided with a male thread.
The upper end of the base is provided with a male thread.
The upper end of the shell is provided with female thread which is connected with the male thread at the lower end of the head seat, and the lower end of the shell is provided with female thread which is connected with the male thread at the upper end of the base.
The outer diameter of the upper spline housing is smaller than the inner diameter of the channel in the head seat.
The outer diameter of the upper end of the lower spline housing is smaller than the inner diameter of the inner channel of the upper end of the base.
Compared with the prior art, the utility model solves the problem that the power loss occurs because the long shaft falls downwards under the action of gravity when the flexible shaft meets a well with overlarge inclination at present, has simple processing mode and quick assembly, and also has the following advantages:
1. at present, the flexible shaft in a universal joint mode has axial extension change during transmission, and the length change of the shaft extension aggravates the abrasion of screw pump rubber. The long straight shaft mode of the utility model avoids the phenomenon.
2. The transmission shaft is arranged and connected with the spline housing in a spline mode, so that the power transmission efficiency is higher, and the influence of gravity cannot be caused.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: the bearing comprises a shell 1, a base 2, a liquid inlet 3, a transmission shaft 4, a lower spline housing 5, an upper spline housing 6, a radial bearing 7 and a head seat 8.
Detailed Description
The utility model will be further explained with reference to the drawings in the following description:
as shown in figure 1, the flexible shaft for connecting the electric submersible screw pump and the driving assembly comprises a shell 1, a base 2, a liquid inlet 3, a transmission shaft 4, a lower spline housing 5, an upper spline housing 6, a radial bearing 7 and a head base 8. The upper end of the shell 1 is provided with female thread which is connected with the male thread at the lower end of the head seat 8, and the lower end of the shell 1 is provided with female thread which is connected with the male thread at the upper end of the base 2. Be equipped with transmission shaft 4 in the casing 1, 4 upper ends of transmission shaft are equipped with the spline, are connected with upper spline housing 6, and 4 lower extremes of transmission shaft are equipped with the spline, are connected with lower spline housing 5. Inside lower spline housing 5 lower extreme stretched into base 2, be equipped with 2 journal bearing 7 between lower spline housing 5 and base 2, journal bearing 7 was used for supporting and rights lower spline housing 5. Around the lower splined hub 5, the drive shaft 4 and the upper splined hub 6 are fluid passages. And 3 liquid inlets 3 are arranged on the base 2.
During operation: the head base 8 is connected with a pump through internal threads, and a pump shaft extends into the head base 8 and is connected with the upper portion of the upper spline housing 6 through a spline. The lower end of the base 2 is connected with the upper end flange of the protector, and the bottom end of the lower spline housing 5 is connected with the shaft of the protector through a spline. When the equipment runs, power is transmitted through the lower spline housing 5 to drive the transmission shaft 4 and the upper spline housing 6, finally the rotor is driven, fluid in the well enters through the liquid inlet 3, flows upwards through a fluid channel formed by the lower spline housing 5, the transmission shaft 4, the upper spline housing 6 and the inner wall of the shell 1, and flows into the pump.
Claims (8)
1. The utility model provides a connect electric submersible screw pump and drive assembly's flexible shaft, includes casing (1), base (2), inlet (3), transmission shaft (4), lower spline housing (5), goes up spline housing (6), radial bearing (7) and headstock (8), characterized in that: casing (1) lower part is connected with base (2), casing (1) upper portion is connected with headstock (8), be equipped with inlet (3) on base (2), transmission shaft (4) set up in casing (1), transmission shaft (4) upper end is equipped with the spline, be connected with last spline housing (6), transmission shaft (4) lower extreme is equipped with the spline, be connected with lower spline housing (5), inside lower spline housing (5) lower extreme stretched into base (2), be equipped with radial bearing (7) between lower spline housing (5) and base (2), lower spline housing (5), transmission shaft (4) and last spline housing (6) are fluid passage with casing (1) annular space.
2. The flexible shaft according to claim 1 for connecting an electric submersible screw pump to a drive assembly, wherein: the number of the radial bearings (7) is 2.
3. The flexible shaft according to claim 1 for connecting an electric submersible screw pump to a drive assembly, wherein: the liquid inlets (3) are 3 and are arranged on the base (2) on the upper side of the radial bearing (7).
4. The flexible shaft according to claim 1 for connecting an electric submersible screw pump to a drive assembly, wherein: the lower end of the head seat (8) is provided with a male thread.
5. The flexible shaft according to claim 1 for connecting an electric submersible screw pump to a drive assembly, wherein: the upper end of the base (2) is provided with a male thread.
6. The flexible shaft according to claim 1 for connecting an electric submersible screw pump to a drive assembly, wherein: the upper end of the shell (1) is provided with female thread which is connected with the male thread at the lower end of the head seat (8), and the lower end of the shell (1) is provided with female thread which is connected with the male thread at the upper end of the base (2).
7. The flexible shaft according to claim 1 for connecting an electric submersible screw pump to a drive assembly, wherein: the outer diameter of the upper spline sleeve (6) is smaller than the inner diameter of the inner channel of the head seat (8).
8. The flexible shaft according to claim 1 for connecting an electric submersible screw pump to a drive assembly, wherein: the outer diameter of the upper end of the lower spline housing (5) is smaller than the inner diameter of the inner channel of the upper end of the base (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121396671.6U CN215486568U (en) | 2021-06-23 | 2021-06-23 | Flexible shaft for connecting electric submersible screw pump and driving assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121396671.6U CN215486568U (en) | 2021-06-23 | 2021-06-23 | Flexible shaft for connecting electric submersible screw pump and driving assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215486568U true CN215486568U (en) | 2022-01-11 |
Family
ID=79720997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121396671.6U Active CN215486568U (en) | 2021-06-23 | 2021-06-23 | Flexible shaft for connecting electric submersible screw pump and driving assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215486568U (en) |
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2021
- 2021-06-23 CN CN202121396671.6U patent/CN215486568U/en active Active
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