Semi-direct-drive motor for oil pumping unit and assembly method

Abstract

The invention relates to the technical field of oil pumping units, and particularly discloses a semi-direct-drive motor for an oil pumping unit and an assembling method.The motor comprises a shell, the shell is formed by assembling a front side plate and a rear cover, and an annular stator and an annular rotor are arranged in the shell; a shaft hole is formed in one side of the shell, an annular step coaxial with the shaft hole is arranged in the shell, the rotor is rotationally connected with the annular step through a bearing, a first annular groove matched with the stator is formed in one side of the rotor, the stator is located in the annular groove, and a rotating gap is formed between the stator and the rotor. The outer side face of the stator is fixedly connected with the shell, and a tensioning connecting mechanism used for fixing an input shaft of the reduction gearbox is arranged in an inner hole of the rotor. The connecting precision of the motor and the reduction gearbox can be improved, the field installation difficulty is reduced, and therefore the stability and reliability of long-term rotation of the motor are improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil pumping units, and in particular to a semi-direct drive motor for an oil pumping unit and an assembly method thereof. Background Art

[0002] The widely used pumping equipment in oil fields is the beam pumping unit, which has a large diameter pulley suspended on the driving shaft of the reducer, and is driven by an asynchronous motor through a belt. The reducer converts the high-speed rotation of the power machine into the low-speed rotation of the pumping crank, and the crank-connecting rod-walking beam mechanism converts the rotational motion into the up and down reciprocating motion of the pumping head, which drives the deep well pump to work through the suspension rope assembly. However, the above drive is large in size, the belt is severely worn, and it needs to be replaced frequently, and the efficiency of the belt transmission is low, which is not conducive to energy saving.

[0003] In recent years, the industry has developed a flat disc motor. The motor housing is fixedly installed on the outside of the oil pump's reduction gearbox through a base structure, and belt drive is no longer required. When installing this type of motor, the accuracy requirements of the reduction gearbox input shaft and the center hole of the motor rotor body are high, which makes on-site adjustment difficult, the accuracy cannot be guaranteed, and the "stirring" problem is prone to occur, which increases power loss and bearing wear. In addition, the base structure needs to be equipped with a bracket on the outside of the reduction gearbox. In the narrow range between the reduction gearbox and the crank, it occupies a large space and requires a large amount of work to transform the structure on the outside of the reduction gearbox. Summary of the invention

[0004] The purpose of the present invention is to address the defects of the prior art and provide a semi-direct drive motor for an oil pump, which can improve the connection accuracy between the motor and the reduction box, reduce the difficulty of on-site installation, and thus improve the long-term rotation stability and reliability of the motor.

[0005] The technical solution of the present invention is: a semi-direct drive motor for an oil pump, the motor comprising a housing, the housing being assembled from a front side plate and a rear cover, the outer side of the front side plate being provided with a flange sleeve for connecting with a reduction box, and an annular stator and rotor being provided in the housing; An axial hole is provided on one side of the shell, and an annular step coaxially arranged with the axial hole is provided in the shell, the rotor is rotatably connected to the annular step through a bearing, a first annular groove adapted to the stator is provided on one side of the rotor, the stator is located in the annular groove, and a rotation gap is provided between the stator and the rotor, the outer side surface of the stator is fixedly connected to the shell, and a tensioning connection mechanism for fixing the input shaft of the reduction box is provided in the inner hole of the rotor.

[0006] Preferably, the tensioning connection mechanism comprises a support tube installed in the inner hole of the rotor, and both ends of the support tube are symmetrically provided with slope openings contracting inward, and a first expansion sleeve and a second expansion sleeve slidingly matched with the slope openings are respectively placed in the two slope openings, and the first expansion sleeve and the second expansion sleeve are transversely connected by a set of adjusting bolts; The input shaft of the reduction gearbox is adapted to the inner holes of the first expansion sleeve and the second expansion sleeve, and the end of the input shaft of the reduction gearbox is detachably connected with a baffle after passing through the first expansion sleeve and the second expansion sleeve in sequence, and the outer edge of the baffle is supported on the outer side of the second expansion sleeve.

[0007] Preferably, the front side of the rotor is also provided with a second annular groove for accommodating the annular step, the outer cylindrical end surface of the bearing is fixedly connected to the inner circumferential surface of the annular groove, the inner cylindrical end surface of the bearing is fixedly connected to the outer circumferential surface of the annular step, and the front side of the rotor is detachably connected with an annular limiting plate that encapsulates the bearing in the second annular groove.

[0008] Preferably, an annular clamping plate is provided in the middle of the cavity of the support tube, and a group of through holes for the adjusting bolts to pass through are provided on the annular clamping plate.

[0009] Preferably, a group of slits are formed around the wall of the support tube, and the slits are used to form a group of elastic supporting sheet structures on the wall of the support tube.

[0010] Preferably, a shaft seal cooperating with the input shaft of the reduction gearbox is provided in the shaft hole of the housing.

[0011] An assembly method for modifying a semi-direct drive motor for a conventional oil pumping unit comprises the above-mentioned semi-direct drive motor for an oil pumping unit, wherein a group of positioning bolt holes are correspondingly provided on the stator and the rotor, and positioning bolts are detachably connected to the positioning bolt holes; The assembly method comprises the following steps: First, remove the bearing end cover of the input shaft of the original pumping unit reduction box; Next, install the front side plate on the outer side of the reduction box through the flange sleeve; Next, the positioning bolts are installed in the positioning bolt holes of the rotor and the stator so that the rotor and the stator form an integrated structure and a uniform rotation gap is maintained between the rotor and the stator; Next, the bearing is installed on the annular step, and then the rotor and stator are integrated into an integrated structure and mounted on the outside of the bearing, and then the stator is fixedly connected to the front side plate; Next, the rotor is connected to the input shaft of the reduction box through a tensioning connection mechanism, and then the positioning bolts connecting the rotor and the stator are removed. At this time, a uniform rotation gap is still maintained between the rotor and the stator. Finally, the rear cover and the front side plate are assembled into a complete shell.

[0012] Compared with the prior art, the present invention has the following advantages: the present invention uses the bearing cover connection hole of the original reduction box for assembly, does not need to modify the housing of the reduction box, and reduces the difficulty of on-site installation; The inner hole of the rotor is connected to the input shaft of the reduction box through a tension connection mechanism, replacing the key connection of the transmission, ensuring concentricity while making disassembly and assembly simple and quick; The present invention improves the installation accuracy of the input shaft of the reduction box and the motor rotor, reduces the difficulty of coaxial installation, avoids the problem of "stirring" during use, thereby greatly reducing the wear on parts and extending the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the assembly of the present invention with a belt-type oil pumping unit; Figure 2 It is a schematic diagram of the assembly of the beam pumping unit of the present invention; Figure 3 It is a structural schematic diagram of the present invention; Figure 4 It is a structural schematic diagram of the tension connection mechanism; Figure 5 is a schematic diagram of the structure of the rotor; Figure 6 It is a schematic diagram of the axial structure of the support tube; Figure 7 It is a schematic diagram of the radial half-section structure of the support tube; Figure 8 This is a schematic diagram of the integrated structure of the rotor and stator; In the figure: 1. flange sleeve, 2. input shaft of reduction gearbox, 3. housing, 4. rear cover, 5. front side plate, 6. rotor, 7. stator, 8. bearing, 9. tensioning connection mechanism, 10. annular step, 11. annular limit plate, 12. first expansion sleeve, 13. support cylinder, 14. second expansion sleeve, 15. adjusting bolt, 16. baffle, 17. first annular groove, 18. second annular groove, 19. reduction gearbox, 20. motor, 21. annular clamping plate, 22. through hole, 23. elastic supporting sheet structure, 24. positioning bolt. DETAILED DESCRIPTION

[0014] The present invention is further described below with reference to the accompanying drawings and embodiments. Example 1

[0015] like Figures 1 to 5 A semi-direct drive motor for an oil pump includes a motor 20. The motor 20 includes a housing 3. The housing 3 is assembled from a rear cover 4 and a front side plate 5. A flange sleeve 1 for connecting to a reduction box 19 is provided on the outside of the housing 3. An annular stator 7 and an annular rotor 6 are provided inside the housing 3.

[0016] An axial hole is opened on the front side plate 5 of the shell 3, and an annular step 10 coaxially arranged with the axial hole is provided in the shell 3. The rotor 6 is rotatably connected to the annular step 10 through a bearing 8. A first annular groove 17 adapted to the stator 7 is provided on one side of the rotor 6. The stator 7 is located in the annular groove, and a rotation gap is provided between the stator 7 and the rotor 6. The outer side surface of the stator 7 is fixedly connected to the shell 3.

[0017] The input shaft 2 of the oil pumping unit reduction box is inserted into the inner hole of the rotor 6 through the flange sleeve 1 and the axial hole of the housing 3. The inner hole of the rotor 6 is provided with a tension connection mechanism 9 for connecting the rotor 6 with the input shaft 2 of the reduction box.

[0018] The tensioning connection mechanism 9 specifically includes a support tube 13 installed in the inner hole of the rotor 6. The two ends of the support tube 13 are symmetrically provided with slope openings that shrink inward. The first expansion sleeve 12 and the second expansion sleeve 14 that slide with the slope openings are respectively placed in the two slope openings.

[0019] The first expansion sleeve 12 and the second expansion sleeve 14 are laterally connected by a group of adjusting bolts 15. Specifically, the first expansion sleeve 12 is provided with a group of threaded holes, and the second expansion sleeve 14 is provided with a group of through holes corresponding to the threaded holes. The adjusting bolts 15 pass through the through holes and are threadedly connected to the threaded holes.

[0020] The input shaft 2 of the reduction gearbox is adapted to the inner holes of the first expansion sleeve 12 and the second expansion sleeve 14 , and the ends of the input shaft 2 of the reduction gearbox are successively inserted into the first expansion sleeve 12 and the second expansion sleeve 14 and are detachably connected with a baffle 16 , the outer edge of which is supported on the outer side of the second expansion sleeve 14 .

[0021] By tightening the adjusting bolt 15, the first expansion sleeve 12 and the second expansion sleeve 14 are moved inward along the slope mouth, and the distance between the first expansion sleeve 12 and the second expansion sleeve 14 is shortened, so that the first expansion sleeve 12 and the second expansion sleeve 14 are used to tighten and fix the support tube 13 and the input shaft 2 of the reduction box, so that the connection between the rotor 6 and the input shaft 2 of the reduction box is more firm and reliable.

[0022] The inner hole of the rotor 6 is connected to the input shaft 2 of the reduction box through the tension connection mechanism 9, replacing the key connection of the transmission, ensuring the concentricity and making the disassembly simple and quick; The present invention improves the installation accuracy of the input shaft 2 of the reduction box and the rotor 6 of the motor 20, reduces the difficulty of coaxial installation, avoids the problem of "stirring" during use, thereby greatly reducing the wear of parts and extending the service life. Example 2

[0023] This embodiment is further optimized on the basis of the above embodiment, specifically: like Figures 3 to 5The front side of the rotor 6 is also provided with a second annular groove 18 for accommodating the annular step 10 , the outer cylindrical end surface of the bearing 8 is fixedly connected to the inner circumferential surface of the annular groove, and the inner cylindrical end surface of the bearing 8 is fixedly connected to the outer circumferential surface of the annular step 10 .

[0024] The front side of the rotor 6 is detachably connected to an annular limit plate 11 that encapsulates the bearing 8 in the second annular groove 18. The design of encapsulating the bearing 8 can not only increase the assembly stability of the bearing 8, but also prevent dust and debris from entering the bearing 8 and causing wear on the bearing 8. Example 3

[0025] This embodiment is further optimized on the basis of the above embodiment, specifically: like Figure 6 and Figure 7 An annular clamping plate 21 is provided in the middle of the cavity of the support tube 13, and a group of through holes 22 for the adjusting bolts 15 to pass through are provided on the annular clamping plate 21. The through holes 22 are evenly spaced. A group of adjusting bolts 15 are evenly spaced through the through holes 22, so that the two expansion sleeves are evenly stressed.

[0026] A group of slits are opened around the wall of the support tube 13, and the slits form a group of elastic support sheet structures 23 on the wall of the support tube 13. Through this structure, when the adjusting bolt 15 is rotated to tighten the two expansion sleeves, the elastic support sheet structure 23 can generate a supporting force outward, thereby tightening and fixing it in the inner hole of the rotor 6, further improving the firmness of the connection between the rotor 6 and the input shaft 2 of the reduction box. Example 4

[0027] A method for assembling a conventional oil pumping unit modified with a semi-direct drive motor comprises a semi-direct drive motor for an oil pumping unit according to the above embodiment, such as Figure 8 A group of positioning bolt holes are correspondingly provided on the stator 7 and the rotor 6, and positioning bolts 24 are detachably connected to the positioning bolt holes.

[0028] The assembly method of converting a conventional oil pump into a semi-direct drive unit specifically includes the following steps: First, remove the input shaft bearing end cover on one side of the reduction box 19 of the original pumping unit; Next, install the front side plate 5 on the outer side of the reduction box 19 through the flange sleeve 1; Next, the positioning bolts 24 are installed in the positioning bolt holes of the stator 7 and the rotor 6, so that the stator 7 and the rotor 6 form an integrated structure, so that a uniform rotation gap is maintained between the stator 7 and the rotor 6; Next, the bearing 8 is installed on the annular step 10, and then the stator 7 and the rotor 6 are integrated into an integrated structure and sleeved on the outside of the bearing 8, so that the rotor 6 is rotatably connected to the annular step 10 through the bearing, and then the stator 7 is fixedly connected to the front side plate 5; Next, the rotor 6 is connected to the input shaft 2 of the reduction box through the tension connection mechanism 9, and then the positioning bolts 24 connecting the stator 7 and the rotor 6 are removed. At this time, a uniform rotation gap is still maintained between the stator 7 and the rotor 6; Finally, the rear cover 4 and the front side plate 5 are assembled into a complete housing 3 .

[0029] The present invention uses the bearing 8 cover connection hole of the original reduction box 19 for assembly, and does not need to modify the outer shell of the reduction box 19, thereby reducing the difficulty of on-site installation.

[0030] The present invention is not limited to the above-mentioned embodiments. Various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention. The changed contents still fall within the protection scope of the present invention.

Claims

1. A semi-direct drive motor for an oil pump, characterized in that: The motor comprises a housing, which is assembled from a front side plate and a rear cover, a flange sleeve for connecting to a reduction box is arranged on the outer side of the front side plate, and an annular stator and rotor are arranged in the housing; An axial hole is provided on one side of the shell, and an annular step coaxially arranged with the axial hole is provided in the shell, the rotor is rotatably connected to the annular step through a bearing, a first annular groove adapted to the stator is provided on one side of the rotor, the stator is located in the annular groove, and a rotation gap is provided between the stator and the rotor, the outer side surface of the stator is fixedly connected to the shell, and a tensioning connection mechanism for fixing the input shaft of the reduction box is provided in the inner hole of the rotor.

2. A semi-direct drive motor for an oil pump according to claim 1, characterized in that: The tensioning connection mechanism comprises a support tube installed in the inner hole of the rotor, and the two ends of the support tube are symmetrically provided with slope openings contracting inward, and a first expansion sleeve and a second expansion sleeve slidingly matched with the slope openings are respectively placed in the two slope openings, and the first expansion sleeve and the second expansion sleeve are transversely connected by a set of adjusting bolts; The input shaft of the reduction gearbox is adapted to the inner holes of the first expansion sleeve and the second expansion sleeve, and the end of the input shaft of the reduction gearbox is detachably connected with a baffle after passing through the first expansion sleeve and the second expansion sleeve in sequence, and the outer edge of the baffle is supported on the outer side of the second expansion sleeve.

3. A semi-direct drive motor for an oil pump according to claim 1, characterized in that: The front side of the rotor is also provided with a second annular groove for accommodating an annular step, the outer cylindrical end surface of the bearing is fixedly connected to the inner circumferential surface of the annular groove, the inner cylindrical end surface of the bearing is fixedly connected to the outer circumferential surface of the annular step, and the front side of the rotor is detachably connected with an annular limiting plate that encapsulates the bearing in the second annular groove.

4. A semi-direct drive motor for an oil pumping unit according to claim 2, characterized in that: An annular clamping plate is provided in the middle of the cavity of the support tube, and a group of through holes for adjusting bolts to pass through are provided on the annular clamping plate.

5. A semi-direct drive motor for an oil pumping unit according to claim 4, characterized in that: A group of slits are formed around the wall of the support tube, and the slits are used to form a group of elastic supporting sheet structures on the wall of the support tube.

6. A semi-direct drive motor for an oil pump according to claim 1, characterized in that: A shaft seal matching the input shaft of the reduction box is arranged in the shaft hole of the shell.

7. An assembly method for converting a conventional oil pumping unit into a semi-direct drive motor, characterized in that: A semi-direct drive motor for an oil pumping unit according to any one of claims 1 to 6, wherein a group of positioning bolt holes are correspondingly provided on the stator and the rotor, and positioning bolts are detachably connected to the positioning bolt holes; The assembly method comprises the following steps: First, remove the bearing end cover of the input shaft of the original pumping unit reduction box; Next, install the front side plate on the outer side of the reduction box through the flange sleeve; Next, the positioning bolts are installed in the positioning bolt holes of the rotor and the stator so that the rotor and the stator form an integrated structure and a uniform rotation gap is maintained between the rotor and the stator; Next, the bearing is installed on the annular step, and then the rotor and stator are integrated into an integrated structure and mounted on the outside of the bearing, and then the stator is fixedly connected to the front side plate; Next, the rotor is connected to the input shaft of the reduction box through a tensioning connection mechanism, and then the positioning bolts connecting the rotor and the stator are removed. At this time, a uniform rotation gap is still maintained between the rotor and the stator. Finally, the rear cover and the front side plate are assembled into a complete shell.

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