阅读说明：本技术 一种直线电机动子芯轴短节间等直径连接装置 (Equal-diameter connecting device for short sections of rotor core shaft of linear motor ) 是由 姜世平 于 2020-05-08 设计创作，主要内容包括：本发明公开了一种直线电机动子短节芯轴间等直径连接装置,包括由若干个内外径均相同的磁钢和隔离套构成的磁钢套,隔离套设置在相邻的所述磁钢之间,磁钢套中设有两对称的短轴,磁钢套的轴腔中还设有连接套,连接套中成型有对称的短轴装配孔,短轴包括防逆转段、螺纹连接段以及防松段,螺纹连接段通过外螺纹与连接套的内螺纹螺纹连接固定,防松段装配在所述磁钢套的轴腔端部,防松段的外径与所述连接套的外径相同,短轴上对应所述防逆转段的位置处还设有防逆转结构,在对应防松段的位置处还设有防松结构。本发明动子沿轴向磁场强度平稳,提高电机效率。用防松装置代替焊接防松,提高动子使用寿命并降低维修成本。(The invention discloses a constant-diameter connecting device between short section core shafts of a linear motor rotor, which comprises a magnetic steel sleeve consisting of a plurality of magnetic steels and isolating sleeves with the same inner and outer diameters, wherein the isolating sleeves are arranged between the adjacent magnetic steels, two symmetrical short shafts are arranged in the magnetic steel sleeve, a connecting sleeve is also arranged in a shaft cavity of the magnetic steel sleeve, symmetrical short shaft assembling holes are formed in the connecting sleeve, each short shaft comprises an anti-reversal section, a threaded connecting section and a locking section, the threaded connecting section is fixedly connected with an inner thread of the connecting sleeve through an outer thread, the locking section is assembled at the end part of the shaft cavity of the magnetic steel sleeve, the outer diameter of the locking section is the same as that of the connecting sleeve, an anti-reversal structure is also arranged at a position, corresponding to the anti-reversal section, on the short shaft, and a locking structure is also arranged at a position corresponding to the locking section. The rotor of the invention has stable magnetic field intensity along the axial direction, and improves the efficiency of the motor. The locking device replaces welding locking, the service life of the rotor is prolonged, and the maintenance cost is reduced.)

1. The utility model provides a linear electric motor active cell nipple joint interaxial constant diameter connecting device, includes the magnetic steel bushing that constitutes by equal magnet steel (4) and spacer sleeve (2) of the inside and outside footpath of a plurality of, the spacer sleeve sets up adjacently between magnet steel (4), be equipped with two symmetry minor axis (3) in the magnetic steel bushing, its characterized in that, still be equipped with adapter sleeve (5) in the lumen of magnetic steel bushing, the shaping has symmetrical minor axis pilot hole in the adapter sleeve, minor axis (3) are including preventing reversing section (6), threaded connection section (7) and locking section (8), threaded connection section (7) through the external screw thread with the internal thread threaded connection of adapter sleeve (5) is fixed, locking section (8) assembly is in the lumen tip of magnetic steel bushing, the external diameter of locking section (8) with the external diameter of adapter sleeve (5) is the same, on minor axis (3) correspond the position department of preventing reversing section (6) still is equipped with prevents reversing structure, and a locking structure is arranged at the position corresponding to the locking section (8).

2. The equal-diameter connecting device between the core shafts of the short section of the linear motor rotor according to claim 1, wherein the diameter of the anti-loosening section (8) is larger than that of the threaded connecting section (7).

3. The equal-diameter connecting device for the short section mandrel of the rotor of the linear motor according to claim 1, wherein the anti-reverse structure comprises an anti-thread reverse rotation ring (11), the connecting sleeve (5) is provided with an annular assembling groove communicated with the short shaft assembling hole at a position corresponding to the anti-reverse rotation section (6), the anti-thread reverse rotation ring (11) is assembled in the annular assembling groove, a stop groove (9) clamped with an inner annular surface of the anti-thread reverse rotation ring (11) is arranged on the outer circumference of the anti-reverse rotation section (6), the magnetic steel sleeve is provided with a radial fastening bolt (10) at a position corresponding to the annular assembling groove, and the lower end of the radial fastening bolt (10) is fixedly connected with an outer annular surface of the anti-thread reverse rotation ring (11).

4. The equal-diameter connecting device between the core shafts of the short section of the rotor of the linear motor according to claim 3, characterized in that the radial fastening bolts (10) are arranged on bolt holes in the isolating sleeve (2).

5. The equal-diameter connecting device for the rotor short section and the mandrel of the linear motor according to claim 1 or 2, wherein the magnetic steel sleeve is provided with the isolating sleeve (2) at a position corresponding to the anti-loosening section (8), the anti-loosening structure comprises a set screw (1), the magnetic steel sleeve is provided with a screw hole on the isolating sleeve (2) corresponding to the anti-loosening section (8), and the set screw (1) is fixedly connected with the outer circumferential surface of the anti-loosening section (8) through the screw hole.

6. The equal-diameter connecting device for the short section and the core shaft of the rotor of the linear motor according to claim 1, wherein the anti-reversion sections (6) of the two short shafts (3) are oppositely arranged at the inner ends of the corresponding short shaft assembly holes, conical exhaust cavities are formed at the inner ends of the short shaft assembly holes, and communication holes for communicating the two symmetrical conical exhaust cavities are formed in the connecting sleeve (5) between the conical exhaust cavities at the inner ends of the two short shaft assembly holes.

7. The equal-diameter connecting device for the short section core shafts of the rotor of the linear motor according to claim 1, wherein the magnetic steel is samarium-cobalt magnetic steel.

8. The equal-diameter connecting device for the short section core shafts of the rotor of the linear motor according to claim 1, wherein the isolation sleeve is made of 45-grade steel.

9. The equal-diameter connecting device between the short section mandrel of the linear motor mover according to claim 1, wherein the short shaft is made of SUS304N2 stainless steel.

10. The equal-diameter connecting device for short section core shafts of rotor of linear motor according to claim 1, wherein the connecting sleeves are made of 20C_rN_iM_oV。

Technical Field

The invention relates to crude oil lifting equipment of an underground submersible linear motor, in particular to a linear motor rotor mandrel equal-diameter connecting device between short sections.

Background

The mover or the secondary of the linear motor is an important component of the cylindrical linear motor. The design quality of the component directly influences the working efficiency and reliability of the linear motor, and the component belongs to the field worth researching. In the past, the design of a rotor mandrel of a cylindrical linear motor mostly adopts threaded connection between the rotor mandrel and a short section and welding looseness prevention, and meanwhile, the axial force generated by the motor is transmitted by a method that the outer diameter of a connecting sleeve is larger than that of the rotor mandrel. The negative effects of this approach are: 1) the welding deformation affects the coaxiality of the mandrel. 2) The welded heat affected zone affects the adjacent magnetic steel, and the magnetic field intensity of the affected magnetic steel is reduced. 3) The welded mandrel has no detachability and poor maintainability, and the maintenance cost of the system is increased. 4) The geometric size of the inner hole of the local magnetic steel is increased, so that the volume of the magnetic steel at the position is reduced, the magnetic flux is reduced, the uniformity of an axial magnetic field of a rotor mandrel is influenced, and the axial thrust of a motor is reduced.

Disclosure of Invention

In view of the above technical problems, an object of the present invention is to provide a constant diameter connection device between short sections of a rotor core shaft of a linear motor, wherein a brand new connection method between the rotor core shaft and the short sections is used to replace the traditional connection method mainly based on welding. The novel connection mode avoids rotor axial magnetic field fluctuation, avoids negative effects caused by welding, enables the rotor core shaft to have detachability and maintainability, improves the reliability of threaded connection, and ensures the coaxiality of the rotor core shaft to the maximum extent, thereby improving the motor efficiency.

In order to realize the purpose, the invention is realized according to the following technical scheme:

an equal-diameter connecting device between short section core shafts of a rotor of a linear motor comprises a magnetic steel sleeve consisting of a plurality of magnetic steels and isolating sleeves with the same inner and outer diameters, the isolation sleeve is arranged between the adjacent magnetic steels, two symmetrical short shafts are arranged in the magnetic steel sleeve, it is characterized in that a connecting sleeve is arranged in the shaft cavity of the magnetic steel sleeve, symmetrical short shaft assembling holes are formed in the connecting sleeve, the short shaft comprises an anti-reverse rotation section, a threaded connection section and a locking section, the threaded connection section is fixedly connected with the internal thread of the connecting sleeve through an external thread, the anti-loosening section is assembled at the end part of the shaft cavity of the magnetic steel sleeve, the outer diameter of the anti-loosening section is the same as that of the connecting sleeve, the position of the short shaft corresponding to the anti-reversion section is also provided with an anti-reversion structure, and the position of the short shaft corresponding to the anti-loosening section is also provided with a loosening-proof structure.

Preferably, the diameter of the loosening prevention section is larger than that of the threaded connection section.

Preferably, the anti-inversion structure comprises an anti-thread anti-inversion ring, an annular assembly groove communicated with the minor axis assembly hole is formed in the position, corresponding to the anti-inversion section, of the connecting sleeve, the anti-thread anti-inversion ring is assembled in the annular assembly groove, a stop groove clamped with an inner annular surface of the anti-thread anti-inversion ring is formed in the outer circumference of the anti-inversion section, a radial fastening bolt is arranged at the position, corresponding to the annular assembly groove, of the magnetic steel sleeve, and the lower end of the radial fastening bolt is fixedly connected with an outer annular surface of the anti-thread anti-inversion ring.

Preferably, the radial set bolt is provided on a bolt hole in the spacer sleeve.

Preferably, the magnetic steel sleeve is provided with one isolating sleeve at a position corresponding to the anti-loosening section, the anti-loosening structure comprises a set screw, the magnetic steel sleeve is provided with a screw hole on the isolating sleeve corresponding to the anti-loosening section, and the set screw is fixedly connected with the outer circumferential surface of the anti-loosening section through the screw hole.

Preferably, the anti-reverse rotation sections of the two short shafts are oppositely arranged at the inner ends of the corresponding short shaft assembly holes, conical exhaust cavities are formed at the inner ends of the short shaft assembly holes, and communication holes for communicating the two symmetrical conical exhaust cavities are formed in the connecting sleeve between the conical exhaust cavities at the inner ends of the two short shaft assembly holes.

Preferably, the magnetic steel is samarium-cobalt magnetic steel.

Preferably, the isolation sleeve is made of 45-grade steel.

Preferably, the material of the short shaft is SUS304N2 stainless steel.

Preferably, the connecting sleeve is made of 20C_rN_iM_oV。

Compared with the prior art, the invention has the following advantages:

the invention applies a short section with the same diameter as a rotor mandrel to connect two adjacent mandrels. Meanwhile, a special-shaped set screw is installed through a radial threaded hole in the short section, and a non-threaded section at the head of the set screw is inserted into an annular groove of a non-threaded section at the end part of the mandrel, so that the purpose of preventing the thread pair at the position from reversing is achieved, namely the purpose of loosening the thread pair is achieved, the component is made to be detachable, and the maintenance reliability of the component is improved. The consistency of the outer diameters of the short sections and the mandrel is ensured, so that the geometric shapes of the magnetic steel at the short sections and the adjacent magnetic steel are the same, the permanent magnetic field is ensured to be the same in the axial distribution rule of the rotor, and the motor efficiency is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a structural cross-sectional view of the present invention;

FIG. 2 is a structural cross-sectional view of a stub shaft 3 according to the present invention;

the anti-loosening device comprises a fastening screw, a spacer sleeve, a short shaft, a magnetic steel, a connecting sleeve, a 5-reversing section, a 7-threaded connecting section, an 8-loosening-preventing section, a 9-stopping groove, a 10-radial fastening bolt and a 11-anti-thread reversing ring, wherein the fastening screw is arranged at the bottom of the spacer sleeve, the short shaft is arranged at the bottom of the spacer sleeve, and the magnetic steel is arranged at the bottom of the spacer sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms "radial," "axial," "upper," "lower," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus are not to be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in figure 1, the equal-diameter connecting device between the short section core shafts of the rotor of the linear motor comprises a magnetic steel sleeve consisting of a plurality of magnetic steels 4 with the same inner and outer diameters and isolating sleeves 2, wherein the isolating sleeves are arranged between the adjacent magnetic steels 4, and two symmetrical short shafts 3 are arranged in the magnetic steel sleeve.

The locking section 8 is assembled at the end part of the shaft cavity of the magnetic steel sleeve, the outer diameter of the locking section 8 is the same as that of the connecting sleeve 5, the position of the short shaft 3 corresponding to the anti-reverse section 6 is also provided with an anti-reverse structure, and the position corresponding to the locking section 8 is also provided with a locking structure.

In the present invention, the diameter of the locking section 8 of the short shaft is larger than that of the threaded connection section 7 of the end. Radial clamping bolts 10 are provided in the bolt holes in the distance tube 2.

The magnetic steel sleeve is provided with an isolation sleeve 2 at the position corresponding to the anti-loosening section 8, the anti-loosening structure comprises a set screw 1, the magnetic steel sleeve is provided with a screw hole on the isolation sleeve 2 at the position corresponding to the anti-loosening section 8, and the set screw 1 is fixedly connected with the outer circumferential surface of the anti-loosening section 8 through the screw hole. The set screw establishes a tight connection between the mandrel and the spacer sleeve for transmitting torque and axial forces on the stator. Adverse thermal influences such as thermal deformation and welding residual stress by the welding stopper ring are avoided.

The anti-reverse sections 6 of the two short shafts 3 are oppositely arranged at the inner ends of the corresponding short shaft assembly holes, conical exhaust cavities are formed at the inner ends of the short shaft assembly holes, and communication holes for communicating the two symmetrical conical exhaust cavities are formed in the connecting sleeve 5 between the conical exhaust cavities at the inner ends of the two short shaft assembly holes.

Wherein, the material of spacer 2 is No. 45 steel, and the material of minor axis 3 is SUS304N2 stainless steel, and the material of adapter sleeve is 20CrNiMoV, and the magnet steel is samarium cobalt class magnet steel.

The spacer sleeve 2 is provided with a bolt hole, the bolt hole is connected with the locking structure arranged at the tail end of the short shaft 3 in a matched mode, the fixing screw 1 is fixed, the thread pair can be prevented from loosening, a plurality of defects caused by welding can be avoided, and meanwhile the rotor mandrel can be guaranteed to have detachability and maintainability.

The anti-reversion structure comprises a thread-proof reversion ring 11, an annular assembly groove communicated with the short shaft assembly hole is formed in the position, corresponding to the anti-reversion section 6, of the connecting sleeve 5, the thread-proof reversion ring 11 is assembled in the annular assembly groove, a stop groove 9 clamped with the inner annular surface of the thread-proof reversion ring 11 is formed in the outer circumference of the anti-reversion section 6, a radial fastening bolt 10 is arranged at the position, corresponding to the annular assembly groove, of the magnetic steel sleeve, and the lower end of the radial fastening bolt 10 is fixedly connected with the outer annular surface of the thread-proof reversion ring 11.

The set screw 1 is a stainless steel screw, so that the threaded connection pre-tightening torque can be transmitted, and the axial push-pull force generated by the section of the motor can be transmitted.

The working principle of the invention is as follows: the radial dimension deviation of the two symmetrical short shafts 3 and the connecting sleeve 5 is strictly controlled during machining, and the coaxiality of the three parts is ensured to meet the requirement of a design drawing. In the axial direction, the closed relation of the size chain is strictly controlled among the short shaft 3, the magnetic steel 4, the isolation sleeve 2 and the connecting sleeve 5, the size deviation needs to be selected and matched during assembly, and tight connection of all related parts in a gapless state is guaranteed. The radial clamping screw 10 is inserted into the locking groove 9 and serves to prevent the screw pair from reversing. The conical surface of the head of the set screw 1 is inserted into the radial surface of the short shaft 3 to play a role in preventing the axial movement between the two, and simultaneously can bear the pre-tightening torque generated when the thread pair is pre-tightened. The set screw 1 and the radial set bolt 10 are fine-tooth stainless steel screws.

The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.