Bearing structure device of flameproof variable frequency speed regulation three-phase asynchronous motor

Abstract

The application discloses a kind of flameproof variable frequency speed regulation three-phase asynchronous motor bearing structure device, including cylindrical roller bearing, deep groove ball bearing, stop washer, round nut, front outer cover, front end cover, front inner cover, rotor, rear end cover, rear inner cover, oil seal ring and IP67 sealing structure, front inner cover and oil seal ring are equipped on motor rotating shaft, deep groove ball bearing is equipped in front inner cover bearing chamber, deep groove ball bearing right side is close to motor rotating shaft shoulder, the inner sleeve of cylindrical roller bearing is equipped on motor rotating shaft, close to deep groove ball bearing left side with stop washer, round nut is tightened and fixed, front outer cover is fixedly connected with front end cover, rear end cover is equipped with rear inner cover, IP67 sealing structure is equipped with front outer cover.The O-shaped sealing ring position of the application is formed with the front end cover in plane sealing mode, and the installation is convenient.The shaft extension end sealing cancels the previous skeleton oil seal structure, IP67 structure type is used, and the protection performance is further strengthened, which provides a good guarantee for stable and reliable operation of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of explosion-proof variable frequency speed regulation three-phase asynchronous motor for coal mine underground working face conveyor, in particular to a bearing structure device of explosion-proof variable frequency speed regulation three-phase asynchronous motor. BACKGROUND

[0002] With the progress and development of scientific and technological level, the coal mine underground working face transmission system generally uses variable frequency speed regulation motor to drive the conveyor, which effectively solves the problems of large impact during starting process, starting difficulty and other problems. It fully embodies the advantages of energy saving, high efficiency, stable performance and the like. However, due to the poor environment and complex working conditions of the coal mine underground working face, the phenomenon of roof falling and pressure sliding often occurs, and the high-order harmonic and direct current component generated by the frequency converter driven motor during low frequency and low speed starting operation, shaft voltage and shaft current and other unfavorable factors directly affect the service life of the motor. There are many cases of bearing damage and burning during use. Therefore, the bearing structure device of the explosion-proof variable frequency speed regulation motor is an important factor to mark the quality of the motor product. In the development and application, only continuous exploration, improvement and optimization of the bearing structure device can make the motor run stably and reliably, better meet the working conditions and meet the user's requirements.

[0003] The variable frequency speed regulation motor of the prior art adopts a bearing structure device type, the shaft extension end is composed of a front inner cover, a felt ring oil seal, a cylindrical roller bearing, a deep groove ball bearing, a stop washer, a round nut, a front end cover, an O-shaped sealing ring, a front outer cover, a skeleton oil seal and the like. The non-shaft extension end is composed of a rear inner cover, a rear end cover, a rear outer cover, a felt ring oil seal, an O-shaped sealing ring and the like. The front inner cover and the front outer cover of the shaft extension end are fitted on the rotor shaft. The front outer cover and the front end cover are respectively connected and fixed with the front inner cover, the front end cover is fitted on the left end of the motor base and is connected and fixed together, the skeleton oil seal is fitted in the front outer cover, and the felt ring oil seal is fitted in the front inner cover. The part is in a static state. The rear inner cover and the rear outer cover of the non-shaft extension end are respectively connected and fixed with the rear end cover. The rear end cover is fitted on the right end of the motor base and is fixed together. The felt ring oil seal is fitted in the rear inner cover. The part is in a static state. The two bearings of the shaft extension end are fitted in the front inner cover and are fixed by the stop washer and the round nut. The cylindrical roller bearing sleeve of the non-shaft extension end is fitted in the bearing chamber of the rear end cover, and the bearing inner sleeve is fitted on the position of the shaft, and is fixed by the shaft retainer. The above is the improved bearing structure device type. The schematic diagram is shown in Fig. 1. Figure OneIt can be seen that the two bearings at the left end are arranged in the front inner cover, the position of the bearings is positioned by the cylindrical roller bearing and the shaft shoulder and the bearing inner sleeve, the outer sleeve is embedded in the bearing chamber of the inner cover, C3 clearance bearing is adopted, it is difficult to play the role of overall axial positioning of the bearing, in addition, the front end cover and the front outer cover are connected and fixed with the front inner cover. The axial force generated by the operation of the unit is concentrated on the front inner cover, and the front inner cover bears a large mechanical strength. However, the above-mentioned problems are prone to axial displacement due to the bearing positioning form and the connection and fixing mode. The results of the user in the actual application of this structure are that the connection and fixing bolts of the front end cover and the front inner cover are loose, the threads are damaged due to the large axial force generated by the motor under the action of low frequency, low speed and large torque, sudden change and short time overload under complex working conditions, the connection bolts of the rear inner cover and the rear end cover are loose, the thread of the rear inner cover is broken, the retaining ring for fixing the bearing shaft is deformed and falls off, the bearing frame is burned, and the unit cannot be operated and the production is stopped. SUMMARY

[0004] Therefore, it is necessary to provide a bearing structure device of an explosion-proof variable frequency speed regulation three-phase asynchronous motor.

[0005] A bearing structure device of an explosion-proof variable frequency speed regulation three-phase asynchronous motor, comprising a cylindrical roller bearing, a deep groove ball bearing, a stop washer, a round nut, a front outer cover, a front end cover, a front inner cover, a rotor, a rear end cover, a rear inner cover, an oil seal ring and an IP67 sealing structure, the front inner cover and the oil seal ring are arranged on the motor rotating shaft, the deep groove ball bearing is arranged in the bearing chamber of the front inner cover, the right side of the deep groove ball bearing abuts against the motor rotating shaft shoulder, the front inner cover is fixed with the front end cover through screws, the inner sleeve of the cylindrical roller bearing is arranged on the motor rotating shaft and is fixed by the stop washer and the round nut, the front outer cover is fixedly connected with the front end cover, the rear end cover is arranged with the rear inner cover, and the IP67 sealing structure is arranged with the front outer cover.

[0006] Preferably, an axle retaining ring is arranged between the oil seal ring and the front inner cover, and the axle retaining ring is an elastic retaining ring.

[0007] Preferably, the oil seal ring and the motor rotating shaft are in interference fit and rotate together, and the two form a labyrinth sealing structure.

[0008] Preferably, a first O-shaped sealing ring is arranged between the rear end cover and the rear outer cover.

[0009] Preferably, a second O-shaped sealing ring is arranged between the front end cover and the front outer cover.

[0010] The application provides a bearing structure device of an explosion-proof variable frequency speed regulation three-phase asynchronous motor, wherein a deep groove ball bearing is arranged on a motor rotating shaft shoulder position and in a front inner cover bearing chamber, a cylindrical roller bearing inner sleeve is arranged on the motor rotating shaft and is fixed by a stop washer and a round nut, an oil seal ring is arranged on the motor rotating shaft, the cylindrical roller bearing outer sleeve is arranged in the front end cover bearing chamber, and the front end cover is arranged on the position, the front outer cover, the front end cover and the front inner cover are fixed together by screws and bolts. The IP67 sealing structure is arranged after the motor is completely assembled. The application changes the fixing connection mode of the front inner cover, the front end cover and the front outer cover, and the load bearing force is concentrated on the front end cover. The front end cover is arranged in the motor base to form a whole, and the cross-sectional area of the front end cover is increased to improve the mechanical strength and the load bearing capacity. The shaft extension end changes the bearing installation position. The deep groove ball bearing is arranged on the motor rotating shaft shoulder position and in the front inner cover bearing chamber, the length of the front inner cover bearing chamber is shortened, the bearing chamber is separately arranged with the deep groove ball bearing, the possibility that the front inner cover is damaged due to axial force is effectively prevented, the connection and fixing direction of the front end cover is changed, and the bolt loosening caused by the axial force is avoided. The inner cover sealing cancels the felt ring oil seal and adopts the labyrinth sealing structure to greatly improve the sealing protection performance, solves the problem that the bearing chamber oil flows into the motor cavity to cause the winding insulation resistance to decrease, and prolongs the service life of the bearing. The front outer cover is arranged with an O-shaped sealing ring, and the placement position is changed. The O-shaped sealing ring is arranged in a plane sealing mode with the front end cover, the O-shaped sealing ring is convenient to install and good in protection and difficult to damage. The shaft extension end sealing cancels the previous skeleton oil seal structure and adopts the IP67 structure type, the protection performance is further improved, and the stable and reliable operation of the motor is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a partial structure diagram of the bearing structure device of the explosion-proof variable frequency speed regulation three-phase asynchronous motor.

[0012] In the figure: cylindrical roller bearing 1, deep groove ball bearing 2, stop washer 3, round nut 4, front outer cover 5, front end cover 6, front inner cover 7, rotor 8, rear end cover 9, rear inner cover 10, oil seal ring 11, IP67 sealing structure 12, shaft stop ring 13, first O-shaped sealing ring 14, second O-shaped sealing ring 15, motor rotating shaft a. DETAILED DESCRIPTION

[0013] In order to make the technical scheme of the application easier to understand, the technical scheme of the application is clearly and completely described in the way of specific embodiments in combination with the drawings.

[0014] Please refer to Figure 1The bearing structure device of the explosion-proof variable frequency speed regulation three-phase asynchronous motor comprises a cylindrical roller bearing 1, a deep groove ball bearing 2, a stop washer 3, a round nut 4, a front outer cover 5, a front end cover 6, a front inner cover 7, a rotor 8, a rear end cover 9, a rear inner cover 10, an oil seal ring 11 and an IP67 sealing structure 12, the front inner cover 7 and the oil seal ring 11 are matched and arranged on a motor rotating shaft a, the deep groove ball bearing 2 is matched and arranged in a bearing chamber of the front inner cover 7, the right side of the deep groove ball bearing 2 abuts against the shoulder of the motor rotating shaft a, the front inner cover 7 is fixed with the front end cover 6 through screws, the inner sleeve of the cylindrical roller bearing 1 is matched and arranged on the motor rotating shaft a, abuts against the left side of the deep groove ball bearing 2 and is fixed through the stop washer 3 and the round nut 4, the front outer cover 5 is fixedly connected with the front end cover 6, the rear end cover 9 is matched and arranged with the rear inner cover 10, the IP67 sealing structure 12 is matched and arranged with the front outer cover 5, and the rotor 8 is matched and arranged with the motor rotating shaft a.

[0015] The shaft baffle 13 is matched and arranged between the oil seal ring 11 and the front inner cover 7, the shaft baffle 13 is an elastic baffle, the oil seal ring 11 is in interference fit with the motor rotating shaft a and rotates together with the motor rotating shaft a, and the oil seal ring 11 and the motor rotating shaft a form a labyrinth sealing structure, the sealing performance is better than that of a felt ring oil seal, the bearing is not heated, the grease is not diluted and flows into a motor cavity, the insulation resistance of a winding is not reduced, and the service life of the bearing is prolonged.

[0016] The first O-shaped sealing ring 14 is matched and arranged between the rear end cover 9 and the rear outer cover.

[0017] The second O-shaped sealing ring 15 is matched and arranged between the front end cover 6 and the front outer cover 5.

[0018] After the two oil seal rings 11 are matched and arranged with the front inner cover 7 and the rear inner cover 10 respectively, a labyrinth sealing structure is formed, the front inner cover 7, the rear inner cover 10, the front outer cover 5 and the rear outer cover are fixedly connected with end covers,

[0019] The application provides a bearing structure device of an explosion-proof variable frequency speed regulation three-phase asynchronous motor, wherein a deep groove ball bearing 2 is arranged on a shoulder position of a motor rotating shaft a and in a bearing chamber of a front inner cover 7, a cylindrical roller bearing 1 inner sleeve is arranged on the motor rotating shaft a and is fixed by a stop washer 3, a round nut 4 and an oil seal ring 11, and the oil seal ring 11 is arranged on the motor rotating shaft a, and then the cylindrical roller bearing 1 outer sleeve is arranged in the bearing chamber of a front end cover 6, and the front end cover 6 is arranged on the motor rotating shaft a, and the front outer cover 5, the front end cover 6 and the front inner cover 7 are fixed together by screws and bolts. The IP67 sealing structure 12 is arranged on the motor after the motor is completely assembled. The application changes the fixing connection mode of the front inner cover 7, the front end cover 6 and the front outer cover 5, and the load bearing force is concentrated on the front end cover 6. The front end cover 6 is arranged in the motor base to form a whole, and the cross-sectional area of the front end cover 6 is increased to improve the mechanical strength and the load bearing capacity. The shaft extension end changes the bearing installation position. The deep groove ball bearing 2 is arranged on the shoulder position of the motor rotating shaft a and in the bearing chamber of the front inner cover 7, and the length of the bearing chamber of the front inner cover 7 is shortened. The bearing chamber is separately arranged with the deep groove ball bearing 2 to prevent the front inner cover 7 from being damaged by the axial force. The connection and fixing direction of the front end cover 6 is changed to prevent the bolt from loosening due to the axial force. The inner cover sealing cancels the felt ring oil seal and adopts the labyrinth sealing structure to improve the sealing performance. The problem that the bearing chamber oil flows into the motor cavity to reduce the winding insulation resistance is solved, and the service life of the bearing is prolonged. The second O-shaped sealing ring 15 is arranged on the front outer cover 5, and the arrangement position is changed. The second O-shaped sealing ring 15 is arranged in a plane sealing mode with the front end cover 6, and the arrangement is convenient and the second O-shaped sealing ring 15 is not easy to be damaged. The shaft extension end sealing cancels the previous skeleton oil seal structure and adopts the IP67 structure 12 type, and the sealing performance is further improved to provide a good guarantee for the stable and reliable operation of the motor.

[0020] It should be noted that the embodiments described herein are only some embodiments of the application, not all implementation manners of the application, and the embodiments are only exemplary, and the role is only to provide a more intuitive and clear way to understand the content of the application, and is not a limitation on the technical solutions of the application. Without departing from the concept of the application, all other embodiments that can be thought of by those skilled in the art without creative labor and other simple replacements and various changes of the technical solutions of the application all belong to the protection scope of the application.

Claims

1. A kind of flameproof variable frequency speed regulation three-phase induction motor bearing structure device, it is characterized by: The bearing structure device of the flame-proof variable frequency speed regulation three-phase asynchronous motor comprises a cylindrical roller bearing, a deep groove ball bearing, a stop washer, a round nut, a front outer cover, a front end cover, a front inner cover, a rotor, a rear end cover, a rear inner cover, an oil seal ring and an IP67 sealing structure, the front inner cover and the oil seal ring are matched and arranged on a motor rotating shaft, the deep groove ball bearing is matched and arranged in a bearing chamber of the front inner cover, the deep groove ball bearing is tightly arranged on a shoulder of the motor rotating shaft on the right side, the front inner cover is fixed with the front end cover through screws, the inner sleeve of the cylindrical roller bearing is matched and arranged on the motor rotating shaft, is tightly arranged on the left side of the deep groove ball bearing and is fixed through the stop washer and the round nut, the front outer cover is fixedly connected with the front end cover, the rear end cover is matched and arranged with the rear inner cover, and the IP67 sealing structure is matched and arranged with the front outer cover.

2. The flame-proof variable frequency speed control three-phase induction motor bearing structure apparatus as claimed in claim 1, wherein: The oil seal ring is matched and arranged with the front inner cover through an axle baffle, and the axle baffle is an elastic baffle.

3. The explosion-proof variable frequency speed-adjustable three-phase induction motor bearing structure device according to claim 2, characterized in that: The oil seal ring is in interference fit with the motor rotating shaft and rotates together with the shaft, and the two form a labyrinth sealing structure.

4. The explosion-proof variable frequency speed-adjustable three-phase induction motor bearing structure device according to claim 3, characterized in that: A first O-shaped sealing ring is matched and arranged between the rear end cover and the rear outer cover.

5. The flame-proof variable frequency speed control three-phase induction motor bearing structure apparatus as claimed in claim 4, wherein: A second O-shaped sealing ring is matched and arranged between the front end cover and the front outer cover.

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