Permanent magnet axial magnetic flux driving device for oil pumping unit

Abstract

The utility model relates to the technical field of oil pumping units, in particular to a permanent magnet axial magnetic flux driving device for an oil pumping unit, which comprises a base and a beam-pumping unit, and the beam-pumping unit is mounted on the upper side of the left of the base. The beam-pumping unit is reasonable and compact in structure, when the beam-pumping unit is used, the permanent magnet axial magnetic flux driving device is electrically connected with the frequency converter, the frequency converter drives the driving shaft of the permanent magnet axial magnetic flux driving device to rotate, the speed reducer connected with the driving shaft is used for speed reduction, and the output shaft of the speed reducer drives the beam-pumping unit to work to achieve the purpose of oil extraction. Compared with a traditional driving mode of a beam-pumping unit, the permanent magnet axial magnetic flux driving device can improve efficiency, reduce starting current, omit a transmission mechanism of a belt and a belt pulley, improve transmission efficiency, reduce maintenance cost and avoid potential safety hazards under the condition of the same specification and size. And the overload torque of the driving shaft can be improved, and more complex working conditions can be coped with.

Description

Technical Field

[0001] This utility model relates to the field of oil pumping unit technology, and is a permanent magnet axial flux drive device for oil pumping units. Background Technology

[0002] Beam pumping units have advantages such as simple structure, high reliability, and convenient maintenance, and play a crucial role in the oil extraction industry. However, due to the driving characteristics of the beam pumping unit itself, it has disadvantages such as low transmission power factor, low efficiency (high power consumption), and small overload torque.

[0003] Traditional beam pumping units use an asynchronous motor, belt (pulley), and reducer to drive the connecting rod in a reciprocating motion for oil extraction. Asynchronous motors have the following drawbacks: unstable rotor quality; during aluminum casting, poor aluminum flow can occur, causing the aluminum bars in the rotor slots to break or thin, affecting performance; they are long, bulky, and heavy; their efficiency is relatively low due to the high resistivity of the cast aluminum rotor, especially under light loads; they have a low power factor, requiring more reactive power and additional reactive power compensation equipment; their starting performance is limited, with a large starting current but low starting torque; and their speed regulation performance is poor, with a limited speed range, making them unsuitable for applications requiring precise speed control. Using traditional asynchronous motors results in fixed-frequency starting, large starting current, low power factor, and significant reactive power losses.

[0004] Traditional beam pumping units employ a two-stage reduction drive. The conventional asynchronous motor's speed is first reduced by a pulley, then further reduced by a reducer to reach the speed required for the connecting rod's reciprocating motion. This two-stage reduction inherently leads to efficiency losses in the drive system. The efficiency of this mechanism is calculated as "asynchronous motor efficiency × belt transmission efficiency × reducer efficiency," resulting in significant transmission efficiency losses. Furthermore, prolonged belt wear and damage to the pulley wrap angle cause belt slippage and breakage, which also greatly reduces the pumping unit's system efficiency. Moreover, belts and pulleys used for extended periods require regular replacement, consuming substantial manpower and resources annually and posing significant safety hazards to oilfield production operations. Summary of the Invention

[0005] This invention provides a permanent magnet axial flux drive device for oil pumping units, which overcomes the shortcomings of the prior art and can effectively solve the problems of low efficiency and high safety hazards of existing asynchronous motor driven beam pumping units.

[0006] The technical solution of this utility model is achieved through the following measures: A permanent magnet axial flux drive device for an oil pumping unit includes a base and a walking beam type oil pumping unit. The walking beam type oil pumping unit is installed on the upper left side of the base. The walking beam type oil pumping unit includes a frame, a working head, a walking beam, a connecting rod, a crank, and a reducer. The frame is fixedly installed on the upper left side of the base, and the upper side of the frame is hinged to the lower middle side of the walking beam. The working head is fixedly installed on the left side of the walking beam. A connecting rod is hinged to the lower side of the walking beam corresponding to the right side of the frame. The lower end of the connecting rod is hinged to the left end of the crank. A support seat is fixedly installed on the upper right side of the base, and the reducer is fixedly installed on the support seat. On the upper rear side of the seat, the right end of the crank is fixedly installed together with the outer side of the output shaft of the reducer. The permanent magnet axial flux drive device includes a support seat, a protective shell, a drive shaft, a stator, a rotor, a coil, and a permanent magnet. The protective shell is fixedly installed on the upper front side of the support seat. The drive shaft is located in the center of the protective shell. The front center of the drive shaft has a through mounting hole. The outer front side of the input shaft of the reducer is fixedly installed in the mounting hole. The stator is fitted on the outer front side of the drive shaft. The rear end of the stator is fixedly installed together with the front end of the protective shell. The coil is located on the rear side of the stator. The rotor, fitted inside the protective shell, is fixedly installed on the outer rear side of the drive shaft. The permanent magnet is located on the front side of the rotor.

[0007] The following are further optimizations and / or improvements to the above-mentioned utility model technical solution:

[0008] A fixing sleeve can be fixedly installed on the inner side of the stator. Two bearings are provided between the inner side of the fixing sleeve and the outer side of the drive shaft at a distance. An end cover is fixedly installed at the front end of the fixing sleeve. A front limiting ring platform is provided at the rear end of the end cover, which contacts the front end of the bearing. A rear limiting ring platform is fixed at the front end of the rotor. The front end of the rear limiting ring platform contacts the rear end of the bearing.

[0009] A connecting flange can be fixedly installed on the outer rear part of the aforementioned drive shaft, and a fixing ring platform is fixedly installed inside the rear end of the rotor. The connecting flange and the fixing ring platform are fixedly installed together.

[0010] The aforementioned mounting hole can be tapered, with a larger front and a smaller rear. A tapered sleeve is provided between the inner side of the mounting hole and the outer front part of the input shaft of the reducer of the walking beam pumping unit.

[0011] This utility model has a reasonable and compact structure. In use, the permanent magnet axial flux drive device is electrically connected to a known frequency converter. The frequency converter drives the drive shaft of the permanent magnet axial flux drive device to rotate, and then the drive shaft is decelerated by a reducer connected to the drive shaft. The output shaft of the reducer drives the beam pumping unit to achieve the purpose of oil extraction. Compared with the traditional drive method of beam pumping units, the permanent magnet axial flux drive device can improve efficiency and reduce starting current. Under the same size, the transmission mechanism of belt and pulley is eliminated, and the original two-stage reduction (pulley and reducer) is reduced to one-stage reduction (reducer), which improves transmission efficiency, reduces maintenance costs, and avoids safety hazards. After replacing the traditional asynchronous motor with the axial permanent magnet synchronous motor, the overload torque of the drive shaft can be improved, which can cope with more complex working conditions. Attached Figure Description

[0012] Appendix Figure 1 These are schematic diagrams of the main structure of embodiments one to four of this utility model.

[0013] Appendix Figure 2 This is a left-side cross-sectional view of the permanent magnet axial flux drive device in embodiments one to four of this utility model.

[0014] The codes in the attached diagram are as follows: 1 for base, 2 for support seat, 3 for protective shell, 4 for drive shaft, 5 for stator, 6 for rotor, 7 for coil, 8 for permanent magnet, 9 for mounting hole, 10 for fixing sleeve, 11 for bearing, 12 for end cover, 13 for front limit ring platform, 14 for rear limit ring platform, 15 for connecting flange, 16 for fixing ring platform, 17 for tapered sleeve, 18 for frame, 19 for working head, 20 for walking beam, 21 for connecting rod, 22 for crank, 23 for reducer, and 24 for frequency converter. Detailed Implementation

[0015] This utility model is not limited to the following embodiments, and the specific implementation method can be determined according to the technical solution of this utility model and the actual situation.

[0016] In this utility model, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0017] The present invention will be further described below with reference to the embodiments and accompanying drawings:

[0018] Example 1: As shown in the attached document Figure 1 , 2As shown, the permanent magnet axial flux drive device for the pumping unit includes a base 1 and a walking beam pumping unit. The walking beam pumping unit is installed on the upper left side of the base 1. The walking beam pumping unit includes a frame 18, a working head 19, a walking beam 20, a connecting rod 21, a crank 22, and a reducer 23. The frame 18 is fixedly installed on the upper left side of the base 1. The upper side of the frame 18 is hinged to the lower middle side of the walking beam 20. The working head 19 is fixedly installed on the left side of the walking beam 20. The connecting rod 21 is hinged to the lower side of the walking beam 20 corresponding to the right side of the frame 18. The lower end of the connecting rod 21 is hinged to the left end of the crank 22. The reducer 23 is fixedly installed on the upper rear side of the support base 2. The right end of the crank 22 is connected to the output shaft of the reducer 23. The permanent magnet axial flux drive device, which is fixedly installed on the outside, includes a support base 2, a protective shell 3, a drive shaft 4, a stator 5, a rotor 6, a coil 7, and a permanent magnet 8. The support base 2 is fixedly installed on the upper right side of the base 1, and the protective shell 3 is fixedly installed on the upper front side of the support base 2. The drive shaft 4 is located in the center of the protective shell 3. The front center of the drive shaft 4 has a through mounting hole 9. The input shaft of the reducer 23 is fixedly installed in the mounting hole 9 on the outer front side. The stator 5 is fitted on the outer front side of the drive shaft 4. The rear end of the stator 5 is fixedly installed together with the front end of the protective shell 3. The coil 7 is located on the rear side of the stator 5. The rotor 6, which is fitted inside the protective shell 3, is fixedly installed on the outer rear side of the drive shaft 4. The permanent magnet 8 is located on the front side of the rotor 6.

[0019] According to the requirements, the stator 5 with coil 7 on the rear side and the rotor 6 with permanent magnet 8 on the front side in the permanent magnet axial flux drive device are both existing technologies, such as the rotor and stator described in the axial flux motor and stator disclosed in Chinese patent document CN114765388A, or the first stator and first rotor described in a dual magnetic circuit adjustable axial permanent magnet motor disclosed in Chinese patent document CN110676996A. The walking beam pumping unit is an existing technology.

[0020] In use, the permanent magnet axial flux drive device is electrically connected to the existing known frequency converter 24. The frequency converter 24 drives the drive shaft 4 of the permanent magnet axial flux drive device to rotate, and then the speed is reduced by the reducer 23 connected to the drive shaft 4. The output shaft of the reducer 23 drives the beam pumping unit to work to achieve the purpose of oil production. Compared with the traditional drive method of beam pumping unit, the permanent magnet axial flux drive device can improve efficiency and reduce starting current. Under the same size, the transmission mechanism of belt and pulley is eliminated, and the original two-stage reduction (pulley and reducer) is reduced to one-stage reduction (reducer), which improves transmission efficiency, reduces maintenance costs, and avoids safety hazards.

[0021] Compared to traditional beam pumping units, this application replaces the original power distribution box with a frequency converter 24, which reduces starting current, decreases the capacity and cost of front-end switching equipment, and replaces the traditional asynchronous motor with an axial permanent magnet synchronous motor. This improves the motor's power factor from 0.8 to 0.95 or even higher, reducing reactive current in the power grid and increasing the overall grid efficiency at the well site. Within the same size and dimensions, the elimination of belts and pulleys reduces the transmission mechanism from two-stage to single-stage reduction, improving transmission efficiency, reducing maintenance costs, and avoiding safety hazards. Compared with traditional beam pumping units, the permanent magnet axial flux drive device for pumping units of this application improves the motor power factor from 0.8 to 0.95, the efficiency from 90% to 95%, reduces the starting current from 7 times the rated current to 1.1 times the rated current, increases the starting torque from 1.5 times the rated torque to 2 times the rated torque, and increases the overload multiple from 1.6 times the rated torque to 2 times the rated torque. By replacing the traditional asynchronous motor with an axial permanent magnet synchronous motor, the overload torque of the drive shaft 4 can be improved, enabling it to cope with more complex working conditions.

[0022] The permanent magnet axial flux drive device for the above-mentioned oil pumping unit can be further optimized and / or improved according to actual needs:

[0023] Example 2: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, a fixing sleeve 10 is fixedly installed on the inner side of the stator 5. Two bearings 11 are provided between the inner side of the fixing sleeve 10 and the outer side of the drive shaft 4 at a front-to-back interval. An end cover 12 is fixedly installed at the front end of the fixing sleeve 10. A front limiting ring platform 13 is provided at the rear end of the end cover 12, which contacts the front end of the bearing 11. A rear limiting ring platform 14 is fixed at the front end of the rotor 6. The front end of the rear limiting ring platform 14 contacts the rear end of the bearing 11.

[0024] According to the requirements, the inner front and inner rear sides of the fixed sleeve 10 are provided with limiting steps. The limiting step at the front and the limiting ring platform 13 can limit the bearing 11 at the front, and the limiting step at the rear and the limiting ring platform 14 can limit the bearing 11 at the rear. The setting of the bearing 11 can reduce the wear between the drive shaft 4 and the stator 5 when the drive shaft 4 rotates, and also facilitate maintenance.

[0025] Example 3: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, a connecting flange 15 is fixedly installed on the outer rear part of the drive shaft 4, and a fixing ring platform 16 is fixedly installed inside the rear end of the rotor 6. The connecting flange 15 and the fixing ring platform 16 are fixedly installed together.

[0026] According to the requirements, the connecting flange 15 and the fixed ring platform 16 are fixed together by a number of connecting bolts distributed at intervals along the circumference. The connecting flange 15 and the drive shaft 4 are integrally set. The setting of the connecting flange 15 facilitates the connection between the drive shaft 4 and the rotor 6. The setting of the fixed ring platform 16 can improve the strength of the connection between the rotor 6 and the connecting flange 15.

[0027] Example 4: As an optimization of the above examples, as shown in the appendix. Figure 1 , 2 As shown, the mounting hole 9 is tapered, with a larger front and a smaller rear. A tapered sleeve 17 is provided between the inner side of the mounting hole 9 and the outer side of the front part of the input shaft of the reducer 23 of the walking beam pumping unit.

[0028] As required, the tapered sleeve 17 is a known technology. This arrangement facilitates the assembly and disassembly of the input shaft of the reducer 23 and the drive shaft 4.

[0029] The above technical features constitute various embodiments of this utility model, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A permanent magnet axial flux drive device for an oil pumping unit, comprising a base and a walking beam type oil pumping unit, wherein the walking beam type oil pumping unit is mounted on the upper left side of the base, the walking beam type oil pumping unit includes a frame, a working head, a walking beam, a connecting rod, a crank, and a reducer, the frame is fixedly mounted on the upper left side of the base, the upper side of the frame is hinged to the lower middle side of the walking beam, the working head is fixedly mounted on the left side of the walking beam, a connecting rod is hinged to the lower side of the walking beam corresponding to the right side of the frame, the lower end of the connecting rod is hinged to the left end of the crank, a support seat is fixedly mounted on the upper right side of the base, the reducer is fixedly mounted on the upper rear side of the support seat, and the right end of the crank is fixedly mounted to the outer side of the output shaft of the reducer, characterized in that... The permanent magnet axial flux drive device includes a support base, a protective shell, a drive shaft, a stator, a rotor, a coil, and a permanent magnet. The protective shell is fixedly installed on the upper front side of the support base. The drive shaft is located in the center of the protective shell. The front center of the drive shaft has a through mounting hole. The input shaft of the reducer is fixedly installed in the mounting hole on the outer front side. The stator is fitted on the outer front side of the drive shaft. The rear end of the stator is fixedly installed together with the front end of the protective shell. The coil is located on the rear side of the stator. The rotor, fitted inside the protective shell, is fixedly installed on the outer rear side of the drive shaft. The permanent magnet is located on the front side of the rotor.

2. The permanent magnet axial flux drive device for an oil pumping unit according to claim 1, characterized in that... A fixed sleeve is fixedly installed on the inner side of the stator. Two bearings are provided between the inner side of the fixed sleeve and the outer side of the drive shaft at a distance. An end cover is fixedly installed at the front end of the fixed sleeve. A front limiting ring platform is provided at the rear end of the end cover, which contacts the front end of the bearing in front. A rear limiting ring platform is fixed at the front end of the rotor. The front end of the rear limiting ring platform contacts the rear end of the bearing behind.

3. The permanent magnet axial flux drive device for an oil pumping unit according to claim 1 or 2, characterized in that... A connecting flange is fixedly installed on the outer rear part of the drive shaft, and a fixing ring platform is fixedly installed inside the rear end of the rotor. The connecting flange and the fixing ring platform are fixedly installed together.

4. The permanent magnet axial flux drive device for an oil pumping unit according to claim 1 or 2, characterized in that... The mounting hole is tapered, wider at the front and narrower at the back, and a tapered sleeve is provided between the inner side of the mounting hole and the outer front part of the input shaft of the beam pumping unit.

5. The permanent magnet axial flux drive device for an oil pumping unit according to claim 3, characterized in that... The mounting hole is tapered, wider at the front and narrower at the back, and a tapered sleeve is provided between the inner side of the mounting hole and the outer front part of the input shaft of the beam pumping unit.

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