CN213574598U - Brushless double-fed motor for oil field screw pump - Google Patents
Brushless double-fed motor for oil field screw pump Download PDFInfo
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- CN213574598U CN213574598U CN202022723507.3U CN202022723507U CN213574598U CN 213574598 U CN213574598 U CN 213574598U CN 202022723507 U CN202022723507 U CN 202022723507U CN 213574598 U CN213574598 U CN 213574598U
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- hollow shaft
- screw pump
- transmission shaft
- box body
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Abstract
The utility model belongs to the field of screw pump motors, in particular to a brushless double-fed motor for an oil field screw pump, which comprises a box body, a bearing, a stator assembly, a rotor assembly and a transmission shaft; the stator assembly comprises two sets of logarithmic windings with different stages, and the stator assembly is arranged on the inner wall of the box body; the rotor assembly comprises a rotor winding and a hollow shaft, the rotor winding is arranged on the hollow shaft, and two ends of the hollow shaft penetrate through and are fixed in the box body through bearings; the transmission shaft is hollow structure, and the transmission shaft runs through the hollow shaft and is fixed with the hollow shaft. The utility model adopts the brushless double-fed wound AC motor, which has stable performance and long service life; the permanent magnet synchronous motor is replaced, demagnetization can be avoided, and the torque is not lost and reduced; the brake performance is excellent, the phenomenon of unstable oscillation of the rotating speed is avoided, the fatigue damage of the sucker rod is small, and the service life is long; the overload capacity is strong, the device is more suitable for complex underground working conditions, the device can be kept to operate stably for a long time without stopping, and the stable production and the efficiency improvement are promoted.
Description
Technical Field
The utility model belongs to screw pump motor field, concretely relates to brushless double-fed motor for oil field screw pump.
Background
The pumping unit is a mechanical equipment for exploiting petroleum, commonly called as a head knocking machine, and the petroleum is discharged out of a well by a pressurizing method. However, more and more screw pump oil production modes gradually replace 'head-knocking machines', and the screw pump oil production mode is used as a new artificial lifting oil production mode and has the characteristics of simplicity in operation, low energy consumption, low equipment investment cost and remarkable oil production effect. Compared with the traditional oil extraction technology, the application of the screw pump oil extraction technology in oil extraction has many advantages, and the technology is rapidly developed in China at present and is greatly supported and popularized by relevant departments.
The screw pump oil production machine is in the field, the working condition is complex, and the screw pump has high starting torque and strong overload capacity to the motor. Particularly, the voltage fluctuation of a power grid is large, the response speed of brake control is high, and a large energy needs to be released in time and braked under the condition that a control system is powered down. The existing oil field screw pump oil extraction permanent magnet direct drive is mainly used, and the main defects of the permanent magnet machine are that in the application process of the permanent magnet direct drive screw pump system, the problems of shutdown stealing, equipment driving incapability, unsafe brake oscillation and the like frequently occur in the running process of a matched permanent magnet motor are gradually discovered, and the main reasons are that the permanent magnet motor has demagnetization and demagnetization problems, and a resistance brake control mode is adopted, so that the anti-reversion performance is poor, and certain potential safety hazards exist in the use process.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pair of brushless double-fed motor for oil field screw pump has replaced current permanent-magnet machine drive arrangement.
The utility model provides a brushless double-fed motor for an oil field screw pump, which comprises a box body, a bearing, a stator assembly, a rotor assembly and a transmission shaft; the stator assembly comprises two sets of logarithmic windings with different stages, and the stator assembly is arranged on the inner wall of the box body; the rotor assembly comprises a rotor winding and a hollow shaft, the rotor winding is arranged on the hollow shaft, and two ends of the hollow shaft penetrate through and are fixed in the box body through bearings; the transmission shaft is hollow structure, and the transmission shaft runs through the hollow shaft and is fixed with the hollow shaft.
As the utility model discloses a further optimization is equipped with the arch on the lateral wall at transmission shaft both ends, the inner wall interference fit of arch and hollow shaft.
As the utility model discloses a further optimization is equipped with the screw hole on the both ends lateral wall of hollow shaft, and the screw hole is located protruding mounted position's the outside.
As the further optimization of the utility model, the utility model also comprises a sealing sleeve; the sealing sleeve is arranged between the hollow shaft and the transmission shaft; the sealing sleeve is positioned outside the mounting position of the protrusion.
As the utility model discloses a further optimization still includes the screw rod, and the end of screw rod and the end of transmission shaft are connected.
As further optimization of the utility model, the utility model also comprises an explosion-proof junction box; the explosion-proof junction box is arranged on the outer wall of the box body.
The utility model discloses following beneficial effect has:
1. the brushless double-fed wound AC motor has stable performance and long service life; the permanent magnet synchronous motor can be replaced, demagnetization can be never realized, and the torque is not lost and reduced.
2. The brake performance is excellent, the phenomenon of unstable oscillation of the rotating speed is avoided, the fatigue damage of the sucker rod is small, and the service life is long.
3. The overload capacity is strong, the device is more suitable for complex underground working conditions, the device can be kept to operate stably for a long time without stopping, and the stable production and the efficiency improvement are promoted.
Drawings
FIG. 1 is a partial cross-sectional view of the present invention;
the anti-explosion motor comprises a box body 1, a bearing 2, a stator assembly 3, a rotor assembly 4, a hollow shaft 41 and an anti-explosion junction box 5.
Detailed Description
Referring to fig. 1, the present embodiment includes a housing 1, a bearing 2, a stator assembly 3, a rotor assembly 4, and a transmission shaft (not shown).
The stator assembly 3 comprises two sets of logarithmic windings of different stages, one set of logarithmic windings is p1, the other set of logarithmic windings is p2, and the two sets of logarithmic windings work in a sine wave mode and have strong selectivity, namely, the p1 winding can hardly induce any harmonic potential except p1 magnetic flux density waves, and the p2 winding can hardly induce any harmonic potential except p2 magnetic flux density waves. The stator assembly is arranged on the inner wall of the box body 1.
The rotor assembly 4 comprises a rotor winding and a hollow shaft 41, and the rotor winding is a self-closed high-efficiency winding. The rotor winding is arranged on the hollow shaft 41, the hollow shaft 41 is a metal shaft with a hollow structure, and the hollow shaft 41 can rotate around the axis line along with the rotor winding. The hollow shaft 41 is sleeved with bearings 2 at two ends thereof, and the bearings 2 are arranged at two ends of the box body 1 and fixed on the box body 1.
The p1 winding is connected with the power supply of the power grid to generate a rotating magnetic field with p1 pole pair number, at the moment, the induced current in the rotor winding generates p2 pole pair magnetic field besides p1 pole pair magnetic field, the two pole pair magnetic fields have opposite rotating directions for the rotor composition 4, and if the p2 winding of the stator is connected with the variable frequency power supply to change the frequency, the output frequency of the generator can be changed, and the brushless double-fed and stepless speed change can be realized.
The transmission shaft is also a metal shaft with a hollow structure, the outer diameter of the transmission shaft is slightly smaller than the inner diameter of the hollow shaft 41, and the transmission shaft penetrates through the hollow shaft 41 and is coaxial with the hollow shaft 41. In this embodiment, a circle of circular protrusions are disposed on the outer side walls of the two ends of the transmission shaft, and the protrusions abut against the inner wall of the hollow shaft 41, i.e., are in interference fit with the hollow shaft 41, so that the transmission shaft is fixed in the hollow shaft 41. The hollow shaft 41 rotates to drive the transmission shaft to rotate.
The output end of the transmission shaft is fixed with the end of the screw, and the transmission shaft rotates to drive the screw to rotate.
Preferably, an explosion-proof junction box 5 is also included. The explosion-proof junction box 5 is arranged on the outer wall of the box body 1, the explosion-proof junction box 5 provides space for wiring of the three-phase alternating current winding of the stator component 3 and the rotor winding of the rotor component 4, the explosion-proof junction box is made of metal materials with certain thickness, and the explosion-proof junction box is firm, good in sealing performance and capable of resisting complex and severe external environments.
In this embodiment, the side walls of the two ends of the hollow shaft 41 are further provided with threaded holes, and the threaded holes are located outside the mounting positions of the protrusions. The jackscrew is pressed against the outer wall of the hollow shaft 41 through the threaded hole. Because the screw rod is difficult to avoid touching hard stone layer at the in-process of the downward rotation exploitation oil, the jackscrew can effectively play the effect of preventing the transmission shaft from removing along axial direction.
Preferably, the device further comprises a sealing sleeve. The sealing sleeve is arranged between the hollow shaft 41 and the transmission shaft, and the sealing sleeve is positioned on the outer side of the installation position of the protrusion.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A brushless double-fed motor for an oil field screw pump is characterized by comprising a box body, a bearing, a stator assembly, a rotor assembly and a transmission shaft; the stator assembly comprises two sets of logarithmic windings with different stages, and the stator assembly is arranged on the inner wall of the box body; the rotor assembly comprises a rotor winding and a hollow shaft, the rotor winding is arranged on the hollow shaft, and two ends of the hollow shaft penetrate through and are fixed in the box body through bearings; the transmission shaft is hollow structure, and the transmission shaft runs through the hollow shaft and is fixed with the hollow shaft.
2. The brushless doubly-fed machine for the oilfield screw pump according to claim 1, wherein the protrusions are arranged on the side walls at the two ends of the transmission shaft, and the protrusions are in interference fit with the inner wall of the hollow shaft.
3. The brushless doubly-fed machine for the oilfield screw pump according to claim 2, wherein the side walls of the two ends of the hollow shaft are provided with threaded holes, and the threaded holes are located outside the mounting positions of the protrusions.
4. The brushless doubly-fed machine for the oilfield screw pump according to claim 2, further comprising a sealing sleeve; the sealing sleeve is arranged between the hollow shaft and the transmission shaft; the sealing sleeve is positioned outside the mounting position of the protrusion.
5. The brushless doubly-fed machine for the oilfield screw pump according to claim 1, further comprising a screw, wherein an end of the screw is connected with an end of the transmission shaft.
6. The brushless doubly-fed machine for the oilfield screw pump according to claim 1, further comprising an explosion-proof junction box; the explosion-proof junction box is arranged on the outer wall of the box body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022723507.3U CN213574598U (en) | 2020-11-23 | 2020-11-23 | Brushless double-fed motor for oil field screw pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022723507.3U CN213574598U (en) | 2020-11-23 | 2020-11-23 | Brushless double-fed motor for oil field screw pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213574598U true CN213574598U (en) | 2021-06-29 |
Family
ID=76539981
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022723507.3U Active CN213574598U (en) | 2020-11-23 | 2020-11-23 | Brushless double-fed motor for oil field screw pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213574598U (en) |
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2020
- 2020-11-23 CN CN202022723507.3U patent/CN213574598U/en active Active
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