CN107819363B - Motor stator and manufacturing method thereof - Google Patents
Motor stator and manufacturing method thereof Download PDFInfo
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- CN107819363B CN107819363B CN201610819795.8A CN201610819795A CN107819363B CN 107819363 B CN107819363 B CN 107819363B CN 201610819795 A CN201610819795 A CN 201610819795A CN 107819363 B CN107819363 B CN 107819363B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
The invention discloses a motor stator and a manufacturing method thereof, belonging to the field of petroleum drilling tools. The motor stator includes: the stator comprises a stator tube body, at least one joint and a rubber bushing; the at least one joint is welded at the end of the stator tube body; the rubber bushing is injected inside the stator tube and the at least one joint. The method comprises the following steps: welding at least one joint to the end of the stator tube; after welding the at least one joint, a rubber bushing is injection-molded inside the at least one joint and the stator tube body by a rubber injection-molding apparatus. According to the invention, the stator pipe body and the joint are welded together, so that the mechanical strength of the motor stator steel pipe shell of the screw drill is ensured, the defect that the motor stator steel pipe shell cannot be repaired in the prior art is overcome, the service life of the motor stator steel pipe shell is prolonged, the production cost of the screw drill is reduced, and the waste of materials is reduced.
Description
Technical Field
The invention relates to the field of petroleum drilling tools, in particular to a motor stator and a manufacturing method thereof.
Background
The screw drilling tool is one kind of underground power drilling tool for well drilling engineering and consists of mainly bypass valve assembly, motor assembly, universal shaft assembly and transmission shaft assembly.
The motor stator that generally uses at present mainly includes the rubber bush of pressure injection on steel pipe casing and the steel pipe casing inner wall, and the tip of steel pipe casing is provided with connecting thread, and this connecting thread is arranged in being connected with other parts in this screw rod drilling tool.
In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:
during the use of the progressive cavity drill, the service life of the motor stator is not matched with the service life of other components in the progressive cavity drill. That is, the connection thread of the steel pipe housing in the motor stator is prematurely failed due to severe wear, or the rubber in the motor stator is prematurely failed due to damage, thereby causing the steel pipe housing in the motor stator to be scrapped, resulting in waste of resources and increase of production costs.
Disclosure of Invention
In order to solve the problems of the prior art, embodiments of the present invention provide a motor stator and a method of manufacturing the same. The technical scheme is as follows:
in one aspect, there is provided a motor stator including: the stator comprises a stator tube body, at least one joint and a rubber bushing;
the at least one joint is welded at the end part of the stator pipe body and is used for being connected with other components in the screw drilling tool;
the rubber bushing is injected inside the stator tube and the at least one joint, and is used for mounting a motor rotor.
Optionally, for each of the at least one fitting, a connecting thread is provided on an inner wall of the fitting, the connecting thread being located at an end remote from the end welded to the stator tube.
Optionally, the inner bore of the rubber bushing has a helicoid shape.
Optionally, the at least one stator and the stator tube are welded by friction welding.
Optionally, the inner diameter of the weld of the at least one joint is the same as the inner diameter of the weld of the stator tube, and the outer diameter of the weld of the at least one joint is the same as the outer diameter of the weld of the stator tube.
Optionally, the wall thickness of the end of the at least one joint welded to the stator tube is within a specified thickness range.
In another aspect, there is provided a method of manufacturing a motor stator, the method including:
welding at least one joint to the end of the stator tube;
after welding the at least one joint, a rubber bushing is injection-molded inside the at least one joint and the stator tube body by a rubber injection-molding apparatus.
Optionally, the at least one joint and the stator tube are welded by friction welding.
Optionally, the welding the at least one joint to the end of the stator tube further comprises:
cutting off the threaded part in the steel pipe shell of the motor stator with damaged threads;
and removing the rubber bushing inside the steel tube shell with the cut thread part to obtain the stator tube body.
Optionally, after welding the at least one joint to the end of the stator tube body, the method further includes:
and annealing the welding seam between the stator pipe body and the at least one joint, and removing flash around the welding seam.
Optionally, after removing the flash around the weld, the method further includes:
and carrying out thermal refining treatment on the welding seam between the stator pipe body and the at least one joint so as to enable the mechanical performance index of the welding seam to be within the range of the specified mechanical performance index value.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the stator pipe body and the joint are welded together, so that the mechanical strength of the motor stator steel pipe shell of the screw drilling tool is ensured, the defect that the motor stator steel pipe shell cannot be repaired in the prior art is overcome, the service life of the motor stator steel pipe shell is prolonged, the production cost of the screw drilling tool is reduced, and the waste of materials is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1A is a schematic view of a motor stator shown in accordance with an exemplary embodiment;
FIG. 1B is a schematic view of another motor stator shown in accordance with an exemplary embodiment;
FIG. 2 is a flow chart illustrating a method of manufacturing a motor stator in accordance with an exemplary embodiment;
FIG. 3 is a flow chart illustrating another method of manufacturing a motor stator in accordance with an exemplary embodiment.
Wherein the reference numerals in the drawings are explained as follows:
1 joint, 2 stator pipe bodies, 3 welding seams, 4 and rubber bushings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1A is a schematic view of a motor stator shown according to an exemplary embodiment, the motor stator comprising: at least one joint 1, a stator tube 2 and a rubber bushing 4;
at least one joint 1 is welded at the end part of the stator pipe body 2, and the at least one joint 1 is used for connecting with other parts in the screw drilling tool;
a rubber bushing 4 is injected inside the stator tube 2 and the at least one joint 1, the rubber bushing 4 being used for mounting the motor rotor.
According to the embodiment of the invention, the stator pipe body and the joint are welded together, so that the mechanical strength of the motor stator steel pipe shell of the screw drill is ensured, the defect that the motor stator steel pipe shell cannot be repaired in the prior art is overcome, the service life of the motor stator steel pipe shell is prolonged, the production cost of the screw drill is reduced, and the waste of materials is reduced.
Optionally, the welding mode of the stator pipe body 2 and the at least one joint 1 may be friction welding, or may be another welding mode that can ensure that the mechanical property of the weld seam 3 between the joint 1 and the stator pipe body 2 can meet the use requirement after welding, which is not specifically limited in this embodiment of the present invention.
One or more joints 1 can be welded at one end of the stator tube body 2, and preferably one joint 1 is welded at one end of the stator tube body 2, so that the joints 1 can be connected with other parts in the screw drill after welding, and the welding workload can be reduced.
The joint 1 is far away from and has the screw thread with the welding terminal surface part inner wall of stator body 2 for be connected with other parts in the screw rod drilling tool, the connecting thread of joint 1 need keep sufficient distance with the welding terminal surface of joint 1 and stator body 2, this sufficient distance is for can guaranteeing when the welding, can not influence the metallographic structure of joint 1 connecting thread, be used for guaranteeing connecting thread's intensity and reliability.
Optionally, a rubber bushing 4 is injected inside the stator tube 2 and the at least one joint 1, the inner bore of the rubber bushing 4 has a helicoid shape, and the rubber bushing 4 is used for mounting the motor rotor.
Alternatively, the inner diameter of the at least one joint 1 and the inner diameter of the welded portion of the stator pipe 2 may be the same or different, and the outer diameter of the at least one joint 1 and the outer diameter of the welded portion of the stator pipe 2 may be the same or different. Preferably, the inner diameter of the at least one joint 1 is the same as the inner diameter of the welded part of the stator pipe body 2, the outer diameter of the at least one joint 1 is the same as the outer diameter of the welded part of the stator pipe body 2, and when the inner diameter of the at least one joint 1 is the same as the inner diameter of the welded part of the stator pipe body 2 and the outer diameter of the at least one joint 1 is the same as the outer diameter of the welded part of the stator pipe body 2, it is possible to ensure that the inner diameter and the outer diameter of the welded part of the stator pipe body and the at least one joint obtained.
Alternatively, the wall thickness of the end of the at least one joint 1 welded to the stator tube 2 is within a specified thickness range, the specified thickness range is determined by the required structure and mechanical properties of the motor stator, and when the wall thickness of the end of the at least one joint 1 welded to the stator tube 2 is within the specified thickness range, the structure and mechanical properties of the welded stator tube 2 and the at least one joint 1 meet the use requirements of the motor stator, for example, when the structure and mechanical properties of the welded stator tube 2 and the at least one joint 1 meet the use requirements of the motor stator, the specified thickness range is 10-25mm, and the wall thickness of the end of the at least one joint 1 welded to the stator tube 2 can be any value of 10-25 mm.
It should be noted that, in a possible implementation manner, as shown in fig. 1A, the joint 1 may be welded at one end of the stator pipe body 2, that is, when the connecting thread at one end of the motor stator steel pipe shell is damaged, the connecting thread at the damaged end is partially cut off to obtain the stator pipe body 2, and the joint 1 is welded at one end of the connecting thread cut off of the stator pipe body 2 steel pipe shell by friction welding. In another possible implementation, as shown in fig. 1B, the joints 1 may be welded at both ends of the stator tube body 2, that is, when the connecting threads at both ends of the motor stator steel tube housing are damaged, the connecting thread portions at both ends are cut off to obtain the stator tube body 2, and the joints 1 are welded at both ends of the stator tube body by friction welding. Alternatively, the stator pipe body 2 is directly machined to a desired length using a steel pipe, and then the joints 1 are welded at both ends thereof by friction welding. The stator pipe body 2 and the joint 1 are both made of low-alloy high-strength steel pipes, and the stator pipe body 2 and the joint 1 can be made of the same or different materials.
The embodiment of the invention welds the stator pipe body and the joint together by friction welding, ensures the mechanical strength of the motor stator steel pipe shell of the screw drill, overcomes the defect that the motor stator steel pipe shell cannot be repaired in the prior art, recycles the motor stator steel pipe shell scrapped in advance, prolongs the service life of the motor stator steel pipe shell, reduces the production cost of the screw drill and reduces the waste of materials. In addition, the stator pipe body with the specified length can be obtained by processing the steel pipe, the stator pipe body is welded with the joint, the motor stator steel pipe shell with the specified length can be obtained, and the problem that the motor stator steel pipe shells with different lengths cannot be interchanged is solved.
FIG. 2 is a flow chart illustrating a method of manufacturing a motor stator according to an exemplary embodiment. Referring to fig. 2, the method includes:
step 201: at least one joint is welded to the end of the stator tube body.
Step 202: after welding the at least one joint, a rubber bushing is injected inside the at least one joint and the stator tube body by a rubber injection device.
According to the embodiment of the invention, the stator pipe body and the joint are welded together, so that the mechanical strength of the motor stator steel pipe shell of the screw drill is ensured, the defect that the motor stator steel pipe shell cannot be repaired in the prior art is overcome, the service life of the motor stator steel pipe shell is prolonged, the production cost of the screw drill is reduced, and the waste of materials is reduced.
FIG. 3 is a flow chart illustrating another method of manufacturing a motor stator in accordance with an exemplary embodiment. Referring to fig. 3, the method includes:
step 301: and cutting off the threaded part in the steel pipe shell of the motor stator with damaged threads.
When the connecting thread of the motor stator steel pipe shell is damaged, the threaded part in the motor stator steel pipe shell with the damaged thread is cut off, and after the threaded part is cut off, a tangent plane is machined into a plane.
Further, the wall thickness of the end of the at least one joint welded to the stator tube body is processed to be within a specified thickness range, the specified thickness range is determined by the required structure and mechanical properties of the motor stator, when the wall thickness of the end of the at least one joint welded to the stator tube body is within the specified thickness range, the structure and mechanical properties of the welded stator tube body and the at least one joint meet the use requirements of the motor stator, for example, when the specified thickness range, in which the structure and mechanical properties of the welded stator tube body and the at least one joint meet the use requirements of the motor stator, is 10-25mm, the wall thickness of the end of the at least one joint welded to the stator tube body can be processed to be any value of 10-25 mm.
The stator pipe body may be obtained by cutting a threaded portion of a motor stator steel pipe housing with a damaged connection thread, or may be obtained by directly machining a steel pipe to a desired length, which is not limited in the embodiment of the present invention.
When the stator pipe body is obtained by directly processing the steel pipe into a required length, the manufacturing method provided by the embodiment of the invention may not include steps 301 and 302.
Step 302: and removing the rubber bushing inside the steel tube shell after the thread part is cut off to obtain the stator tube body.
When the used stator pipe body is a steel pipe shell with damaged threads, the rubber bushing is injected on the inner wall of the steel pipe shell with damaged threads, so that the rubber bushing injected on the inner wall of the steel pipe shell needs to be removed after the thread part of the damaged steel pipe shell is cut off.
Further, the stator tube and at least one of the joints need to be quenched and tempered before welding. The quenching and tempering is double heat treatment of quenching and high-temperature tempering, the purpose of the quenching and tempering is to enable the stator pipe body and at least one joint to obtain good comprehensive mechanical properties, and the quenching and tempering state refers to the state of the stator pipe body and at least one joint after the quenching and tempering.
It should be noted that, the method for quenching and tempering the stator tube body and the at least one joint may refer to the related art, and the embodiment of the present invention is not described in detail.
Step 303: at least one joint is welded to the end of the stator tube body.
It should be noted that the welding mode of the stator pipe body and the at least one joint may be friction welding, or may be other welding modes that can ensure that the mechanical property of the weld between the joint and the stator pipe body can meet the use requirement after welding, and the embodiment of the present invention is not particularly limited to this.
In addition, one or more joints can be welded at one end of the stator pipe body, and preferably, one joint is welded at one end of the stator pipe body, so that the joints can be connected with other parts in the screw drill after welding, and the welding workload can be reduced.
Step 304: and annealing the welding seam between the stator pipe body and the at least one joint, and removing flash around the welding seam.
And annealing the welding seam between the stator pipe body and at least one joint, wherein the annealing refers to slowly heating the metal to a certain temperature, keeping for enough time, and then cooling at a proper speed to eliminate welding stress, improve the comprehensive mechanical property of the welding seam and prolong the service life of the motor stator. During welding, burrs are generated around the weld, and in order not to affect the use of the welded stator pipe body and the joint, the burrs around the weld need to be removed.
It should be noted that, the method for annealing the welding seam between the stator tube body and the at least one joint may refer to the related art, and embodiments of the present invention are not described in detail.
Step 305: and quenching and tempering the welding seam between the stator pipe body and at least one joint to ensure that the mechanical performance index of the welding seam is within the range of the specified mechanical performance index threshold value.
It should be noted that the mechanical property indexes of the weld include: the corresponding specified mechanical performance index threshold range comprises a specified distributed hardness threshold range, a specified yield strength threshold range, a specified tensile strength threshold range, a specified elongation after fracture threshold range and a specified Charpy V-type impact energy threshold range.
When the Brinell hardness of the welding seam is within the specified Brinell hardness threshold range, the yield strength of the welding seam is within the specified yield strength threshold range, the tensile strength of the welding seam is within the specified tensile strength threshold range, the elongation after fracture of the welding seam is within the specified elongation after fracture threshold range, and the Charpy V-shaped impact power of the welding seam is within the specified Charpy V-shaped impact power threshold range, the motor stator can normally work, and the service life of the motor stator reaches the standard.
Step 306: and (3) injecting a rubber bushing inside the at least one joint and the stator tube body by using a rubber injection device.
In which, with a rubber injection molding apparatus, a method of injecting a rubber bushing inside at least one of the joint and the stator pipe body may refer to the related art, and embodiments of the present invention will not be described in detail.
According to the embodiment of the invention, the stator pipe body and the joint are welded together by friction welding, and the welded seam is annealed, flash removed and quenched and tempered after welding, so that the mechanical strength of the motor stator steel pipe shell of the screw drill is ensured, the defect that the motor stator steel pipe shell cannot be repaired in the prior art is overcome, the motor stator steel pipe shell scrapped in advance is reused, the service life of the motor stator steel pipe shell is prolonged, the production cost of the screw drill is reduced, and the waste of materials is reduced. In addition, the stator pipe body with the specified length can be obtained by processing the steel pipe, the stator pipe body is welded with the joint, the motor stator steel pipe shell with the specified length can be obtained, and the problem that the motor stator steel pipe shells with different lengths cannot be interchanged is solved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. A motor stator, comprising: the stator comprises a stator tube body, at least one joint and a rubber bushing;
the at least one joint is welded at the end part of the stator pipe body and is used for being connected with other components in the screw drilling tool;
the rubber bushing is injected inside the stator tube and the at least one joint, and is used for mounting a motor rotor;
a connecting thread is arranged on the inner wall of the joint, which is far away from the welding end face of the stator pipe body, and a set distance is reserved between the connecting thread and the welding end face;
the wall thickness of one end of the at least one joint welded with the stator tube body is 10-25 mm;
the welding mode of the at least one stator and the stator pipe body is friction welding;
the inner diameter of the weld of the at least one joint is the same as the inner diameter of the weld of the stator tube.
2. The motor stator of claim 1, wherein the inner bore of the rubber bushing has a helicoid shape.
3. The motor stator of claim 1, wherein the weld outer diameter of the at least one joint is the same as the outer diameter of the weld of the stator tube.
4. A method of manufacturing a motor stator, the method comprising:
welding at least one joint at the end part of the stator pipe body by adopting friction welding, wherein the inner diameter of the welding part of the at least one joint is the same as that of the welding part of the stator pipe body;
after welding the at least one joint, injection-molding a rubber bushing inside the at least one joint and the stator tube by a rubber injection-molding device;
the inner wall of the joint, which is far away from the welding end face of the stator pipe body, is provided with a connecting thread, and a set distance is reserved between the connecting thread and the welding end face;
the wall thickness of the end of the at least one joint welded to the stator tube body is between 10 and 25 mm.
5. The method of claim 4, wherein welding the at least one fitting to the end of the stator tube further comprises:
cutting off the threaded part in the steel pipe shell of the motor stator with damaged threads;
and removing the rubber bushing inside the steel tube shell after the thread part is cut off to obtain the stator tube body.
6. The method of claim 4, wherein welding the at least one fitting to the end of the stator tube body further comprises:
and annealing the welding seam between the stator pipe body and the at least one joint, and removing flash around the welding seam.
7. The method of claim 6, wherein after removing flash around the weld, further comprising:
and quenching and tempering the welding seam between the stator pipe body and the at least one joint to ensure that the mechanical performance index of the welding seam is within the range of the specified mechanical performance index threshold value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610819795.8A CN107819363B (en) | 2016-09-12 | 2016-09-12 | Motor stator and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610819795.8A CN107819363B (en) | 2016-09-12 | 2016-09-12 | Motor stator and manufacturing method thereof |
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| CN107819363A CN107819363A (en) | 2018-03-20 |
| CN107819363B true CN107819363B (en) | 2020-01-07 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104695853A (en) * | 2015-03-04 | 2015-06-10 | 中国海洋石油总公司 | Motor for screw drill tool and screw drill tool provided with motor |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2690560Y (en) * | 2004-04-08 | 2005-04-06 | 中国石化集团胜利石油管理局工程机械总厂 | Pumping rod special for driving screw pump |
| CN201219215Y (en) * | 2008-06-11 | 2009-04-08 | 大港油田集团中成机械制造有限公司 | Pre-outline type screw drill motor stator |
| CN201396077Y (en) * | 2009-05-07 | 2010-02-03 | 山东宝世达石油装备制造有限公司 | Hollow oil pumping rod |
| CN101656438B (en) * | 2009-09-15 | 2013-10-02 | 江汉石油钻头股份有限公司 | Screw drilling tool motor stator |
| CN101882818B (en) * | 2010-07-14 | 2013-02-20 | 中国石油集团渤海石油装备制造有限公司 | Double-layer shell screw rod drilling tool motor stator |
| CN201742182U (en) * | 2010-07-14 | 2011-02-09 | 中国石油集团渤海石油装备制造有限公司 | Motor stator of self-cooling screw drilling tool with dual-layer shells |
| CN202284450U (en) * | 2011-05-24 | 2012-06-27 | 中国石油大港油田第五采油厂 | Novel insertion hollow rod for driving screw pump |
| CN102386692B (en) * | 2011-09-02 | 2013-05-29 | 西南石油大学 | Ball filling screw drill stator and processing technology |
| EA024018B1 (en) * | 2012-05-30 | 2016-08-31 | Алиби Хакимович Ахмеджанов | Screw downhole motor |
| CN202612105U (en) * | 2012-06-26 | 2012-12-19 | 宁波正鼎石油机械设备制造有限公司 | Screw pump stator connector |
| CN104935092A (en) * | 2014-03-22 | 2015-09-23 | 天津大港油田圣达科技有限公司 | Hollow motor used by novel Zhongcheng screw drill tool |
| CN104675324A (en) * | 2015-03-04 | 2015-06-03 | 中国海洋石油总公司 | PDM (positive displacement motor) drilling tool for well drilling |
| CN204591121U (en) * | 2015-03-04 | 2015-08-26 | 中国海洋石油总公司 | The helicoid hydraulic motor of drilling well |
| CN204532058U (en) * | 2015-03-04 | 2015-08-05 | 中国海洋石油总公司 | Screw drilling tool motor and there is the helicoid hydraulic motor of this motor |
| RU2591216C1 (en) * | 2015-06-02 | 2016-07-20 | Михаил Валерьевич Шардаков | Screw hydraulic machine with variable teeth tension |
-
2016
- 2016-09-12 CN CN201610819795.8A patent/CN107819363B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104695853A (en) * | 2015-03-04 | 2015-06-10 | 中国海洋石油总公司 | Motor for screw drill tool and screw drill tool provided with motor |
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