A high-voltage, large-capacity self-lubricating motor

Abstract

The present invention provides a high-voltage and large-capacity self-lubricating motor, comprising a machine base, a stator, a rotor, a rotating shaft, a shaft extension end bearing device, a non-shaft extension end bearing device, a shaft extension end cover, a non-shaft extension end cover and a top cover, wherein the top cover is arranged above the machine base, and both ends of the top cover have extension parts extending out of the machine base, and an air inlet is opened on the bottom plate of the extension part; a first wind shield is arranged on the bottom plate of the extension part, a second wind shield is arranged in the machine base, and a third wind shield is also arranged on the bottom plate of the top cover; an internal axial fan is also arranged on the rotating shaft below the second wind shield; the outer wall of the extension part and the first wind shield, the first wind shield and the third wind shield, and the second wind shield and the outer wall of the machine base sequentially form a first air duct that is interconnected, and the outside air is processed by the sound-absorbing cotton on the first wind shield, the second wind shield and the third wind shield, so as to effectively absorb and suppress the aerodynamic noise of the motor, thereby achieving the purpose of silencing and noise reduction, and at the same time, the temperature rise rate of the motor can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electric motors, and in particular to a high-voltage and large-capacity self-lubricating motor. Background Art

[0002] At present, with the increase in power density of high-voltage and large-capacity motors, the thermal load and magnetic load of the motors are higher, which can easily cause the motor temperature to rise. Therefore, the design of the motor ventilation and cooling system is crucial. The open motor ventilation and cooling system includes components such as the top cover and internal fan. If the heat dissipation components are not well designed and matched, it is easy to cause internal heat dissipation difficulties and temperature rise in the motor. Long-term operation will cause insulation damage and even motor burnout and other faults.

[0003] In order to meet the temperature rise requirements and solve the problem of high temperature rise, existing high-voltage and large-capacity motors need to use fans with larger size and power, which will increase the ventilation noise of the motor; especially for 2P open motors, the conventional top cover structure is used, the noise is easy to exceed the standard, and the amount of silencer material used is large, which also has an adverse effect on the temperature rise of the motor.

[0004] Furthermore, for high-voltage, large-capacity motors, vibration is crucial to the long-term stable and reliable operation of the motors. For existing high-voltage, large-capacity motors, the base and the bottom of the stator with windings cannot be welded, which can easily cause insufficient stator stiffness or insufficient natural frequency avoidance rate, and the motors are prone to excessive vibration. Summary of the invention

[0005] The object of the present invention is to provide a high-voltage and large-capacity self-lubricating motor, which is used to solve the problems of high temperature rise and inability to weld the base and the bottom of the stator with windings in the existing high-voltage and large-capacity motors.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-voltage, large-capacity self-lubricating motor comprises a base, a stator, a rotor, a rotating shaft, a shaft-end bearing device, a non-shaft-end bearing device, a shaft-end end cover, a non-shaft-end end cover and a top cover, wherein the stator is installed in the base, the rotor is fixedly installed on the rotating shaft and installed with clearance with the stator, the shaft-end end of the motor is installed with the base through the shaft-end bearing device, the shaft-end end cover fixedly connected to the base is arranged outside the shaft-end bearing device, the non-shaft-end end of the motor is installed with the base through the non-shaft-end bearing device, the non-shaft-end end cover fixedly connected to the base is arranged outside the non-shaft-end bearing device; the top cover is fixedly arranged above the base, the vertical center line of the top cover is in line with the vertical center line of the motor, and the structure of the top cover is vertically aligned with the vertical center line of the motor. Symmetrical about the center line; both ends of the top cover have extensions extending out of the base, and an air inlet is provided on the bottom plate of the extension; a first wind shield is provided on the bottom plate of the extension and on the inner side of the air inlet, and the first wind shield is not in contact with the top plate of the extension; second wind shields are symmetrically provided on both sides of the base and the stator, the second wind shield is located on the inner side of the first wind shield, and the second wind shield is not in contact with the rotating shaft; a third wind shield is provided on the bottom plate of the top cover, the third wind shield is located on the inner side of the second wind shield, and the third wind shield is welded to the top plate of the top cover; ventilation openings are provided in the middle of the base and the top cover, and air outlets are provided on both sides of the upper end and the middle of the top cover; an internal axial fan is also provided on the rotating shaft below the second wind shield; ventilation holes are provided on the rotor and the stator along the radial direction.

[0008] There are multiple ventilation holes on the rotor and the stator, and the ventilation holes on the rotor and the stator are arranged in a staggered manner.

[0009] A plurality of welding openings are provided on the bottom plate of the machine base, and a cover plate detachably connected to the welding openings is provided on each of the plurality of welding openings.

[0010] The first windshield, the second windshield and the third windshield are all made of steel plates with sound-absorbing cotton attached.

[0011] The bearings of the non-axle extension end bearing device and the shaft extension end bearing device are both DQ9S-80B self-lubricating bearings.

[0012] Beneficial effects of the present invention:

[0013] The present invention describes a high-pressure, large-capacity self-lubricating motor, in which the outer wall of the extension part and the first wind shield, the first wind shield and the third wind shield, and the second wind shield and the outer wall of the base sequentially form a first air duct that is interconnected. After the outside air enters the interior of the motor through the first air duct, under the action of the internal axial fan, a part of the air turns along the rotating shaft and passes through the ventilation holes on the stator and the rotor in turn, and is finally discharged from the air outlet provided on the top cover; the other part is directly discharged from the air outlet provided on the top cover through the gap between the second wind shield and the stator; the realization of the two-way ventilation structure can ensure that the air inside the motor flows smoothly along the curved path, and after being processed by the sound-absorbing cotton on the first wind shield, the second wind shield and the third wind shield, the aerodynamic noise of the motor is effectively absorbed and suppressed, thereby achieving the purpose of silencing and noise reduction, and at the same time, the temperature rise rate of the motor can be effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] like Figure 1 As shown: A high-voltage, large-capacity self-lubricating motor described in the present invention comprises a base 1, a stator 2, a rotor 3, a rotating shaft 4, an extension end bearing device 17, a non-extension end bearing device 6, an extension end cover 5, a non-extension end cover 7 and a top cover 8, wherein the stator 2 is installed in the base 1, the rotor 3 is fixedly installed on the rotating shaft 4 and is installed with clearance fit with the stator 2, the extension end of the motor is installed with the base 1 through the extension end bearing device 17, and the extension end cover 5 fixedly connected to the base 1 is arranged outside the extension end bearing device 17, and the non-extension end of the motor is installed with the base 1 through the non-extension end bearing device 6, and the non-extension end cover 7 fixedly connected to the base 1 is arranged outside the non-extension end bearing device 6.

[0018] The top cover 8 is fixedly arranged above the base 1, the vertical center line of the top cover 8 is in line with the vertical center line of the motor, and the structure of the top cover 8 is symmetrical about the vertical center line; both ends of the top cover 8 have extensions 9 extending out of the base 1, and an air inlet 10 is opened on the bottom plate of the extension part 9; a first windshield 11 is arranged on the bottom plate of the extension part 9 and on the inner side of the air inlet 10, and the first windshield 11 is not in contact with the top plate of the extension part 9; second windshields 12 are symmetrically arranged inside the base 1 and on both sides of the stator 2, and the second windshield 12 is located on the inner side of the first windshield 11, and the second windshield 12 is not in contact with the rotating shaft 4. touch; a third wind shield 13 is provided on the bottom plate of the top cover 8, the third wind shield 13 is located on the inner side of the second wind shield 12, and the third wind shield 13 is welded to the top plate of the top cover 8; ventilation holes are provided in the middle of the base 1 and the top cover 8, and air outlets 14 are provided on both sides of the upper end and the middle of the top cover 8; an internal axial fan 15 is also provided on the rotating shaft 4 below the second wind shield 12; ventilation holes 16 are provided in the radial direction of the rotor 3 and the stator 2; compared with the top cover 8 of the existing high-voltage and large-capacity self-lubricating motor, the top cover 8 of the existing high-voltage and large-capacity self-lubricating motor has a horizontal air inlet and outlet position, and The top of the top cover 8 is provided with a shutter, and a sound-absorbing baffle is arranged inside the top cover 8, which results in a large height of the top cover 8, poor ventilation and heat dissipation, and a high temperature rise of the motor while reducing noise. The amount of sound-absorbing material used is large, and the sound-absorbing effect is average; the top cover 8 described in the present invention, the air inlet 10 is arranged below the top cover 8, the outer wall of the extension part 9 and the first wind shield 11, the first wind shield 11 and the third wind shield 13, the second wind shield 12 and the outer wall of the base 1 sequentially form a first air duct that is interconnected. After the outside air enters the interior of the motor from the first air duct, under the action of the internal axial flow fan 15, a part of the air is blown out. One part turns along the rotating shaft 4 and passes through the ventilation holes 16 on the stator 2 and the rotor 3 in turn, and is finally discharged from the air outlet 14 opened on the top cover 8; the other part passes through the gap between the second wind shield 12 and the stator 2 and is directly discharged from the air outlet 14 opened on the top cover 8; the realization of the two-way ventilation structure can ensure that the air inside the motor flows smoothly along the curved path, and after being processed by the sound-absorbing cotton on the first wind shield 11, the second wind shield 12 and the third wind shield 13, the aerodynamic noise of the motor is effectively absorbed and suppressed, thereby achieving the purpose of silencing and noise reduction, and at the same time, it can also effectively reduce the temperature rise rate of the motor.

[0019] The preferred solution is: there are multiple ventilation holes 16 opened on the rotor 3 and the stator 2, and the ventilation holes 16 opened on the rotor 3 and the stator 2 are staggered; first, the ventilation holes 16 opened on the rotor 3 and the stator 2 are both opened in the radial direction. Compared with the existing ventilation holes 16 opened in the axial direction, the radial ventilation holes 16 can change the straight wind path in the horizontal direction into a curved wind path, effectively absorbing and suppressing the aerodynamic noise of the motor, thereby achieving the purpose of sound insulation and noise reduction; further, the ventilation holes 16 opened on the rotor 3 and the stator 2 are staggered to ensure that the air passing through the rotor 3 needs to make a turn when flowing through the stator 2 wind path, and then flows out from the ventilation holes 16 opened on the stator 2, further increasing the curved wind path structure, effectively absorbing and suppressing the aerodynamic noise of the motor, thereby achieving the purpose of sound insulation and noise reduction.

[0020] The preferred solution is: a plurality of welding ports are provided on the bottom plate of the base 1, and a cover plate detachably connected to the welding ports is provided on each of the plurality of welding ports; the bottom plate of the base 1 of the existing high-voltage, large-capacity self-lubricating motor is a whole steel plate, and there is no operating space underneath, which makes it impossible to weld the base 1 and the stator 2 core underneath; the base plate described in the present invention can remove the cover plate when necessary, and then weld and disassemble the stator 2 core through the welding ports, which is convenient and practical.

[0021] The preferred solution is: the first wind shield 11, the second wind shield 12 and the third wind shield 13 are all made of steel plates with sound-absorbing cotton attached to them, forming an air duct while ensuring that the air noise passing through the wind shield can be fully absorbed by the wind shield, further reducing the aerodynamic noise of the motor and achieving the purpose of silencing and noise reduction.

[0022] The preferred solution is: the bearings of the non-axle extension end bearing device 6 and the shaft extension end bearing device 17 are both DQ9S-80B self-lubricating bearings; compared with the DQ9-80A self-lubricating bearings used in existing high-pressure and large-capacity self-lubricating motors, the DQ9S-80B self-lubricating bearings are more compact in size, have more heat dissipation ribs outside the bearings, and have a large heat dissipation area, which is beneficial to reducing the temperature rise of the bearings; at the same time, the bearings are more convenient to install and disassemble, and the bearings are equipped with balancing holes, which can effectively prevent oil leakage.

[0023] In the high-pressure, large-capacity self-lubricating motor described in the present invention, the outer wall of the extension part 9 and the first wind shield 11, the first wind shield 11 and the third wind shield 13, the second wind shield 12 and the outer wall of the base 1 sequentially form a first air duct that is interconnected. After the outside air enters the interior of the motor from the first air duct, under the action of the internal axial fan 15, a part of it turns along the rotating shaft 4 and passes through the ventilation holes 16 on the stator 2 and the rotor 3 in turn, and is finally discharged from the air outlet 14 opened on the top cover 8; the other part is directly discharged from the air outlet 14 opened on the top cover 8 through the gap between the second wind shield 12 and the stator 2; the realization of the two-way ventilation structure can ensure that the air inside the motor flows smoothly along the curved path, and after being processed by the sound-absorbing cotton on the first wind shield 11, the second wind shield 12 and the third wind shield 13, the aerodynamic noise of the motor is effectively absorbed and suppressed, thereby achieving the purpose of silencing and noise reduction, and at the same time, the temperature rise rate of the motor can be effectively reduced.

[0024] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage, large-capacity self-lubricating motor, comprising a base, a stator, a rotor, a rotating shaft, a shaft-end bearing device, a non-shaft-end bearing device, a shaft-end end cover, a non-shaft-end end cover and a top cover, wherein: The stator is installed in the base, the rotor is fixedly installed on the rotating shaft and installed with clearance with the stator, the shaft extension end of the motor is installed with the base through the shaft extension end bearing device, and the shaft extension end bearing device is provided with a shaft extension end cover fixedly connected to the base outside the shaft extension end bearing device, and the non-shaft extension end of the motor is installed with the base through the non-shaft extension end bearing device, and the non-shaft extension end bearing device is provided with a non-shaft extension end cover fixedly connected to the base outside; it is characterized in that: the top cover is fixedly arranged above the base, the vertical center line of the top cover is in line with the vertical center line of the motor, and the structure of the top cover is symmetrical about the vertical center line; both ends of the top cover have extension parts extending out of the base, and the bottom plate of the extension part is provided with an air inlet; a first wind shield is provided on the bottom plate of the extension part and on the inner side of the air inlet, and the first wind shield is connected to the extension part The top plate of the top cover does not touch it; a second wind shield is symmetrically arranged on both sides of the machine base and the stator, the second wind shield is located on the inner side of the first wind shield, and the second wind shield does not touch the rotating shaft; a third wind shield is arranged on the bottom plate of the top cover, the third wind shield is located on the inner side of the second wind shield, and the third wind shield is welded to the top plate of the top cover; ventilation holes are provided in the middle of the machine base and the top cover, and air outlets are provided on both sides of the upper end and the middle part of the top cover; an internal axial fan is also provided on the rotating shaft below the second wind shield; ventilation holes are provided in the radial direction of the rotor and the stator; there are multiple ventilation holes on the rotor and the stator, and the ventilation holes on the rotor and the stator are staggered; a plurality of welding ports are provided on the bottom plate of the machine base, and a cover plate detachably connected to the welding ports is provided on the multiple welding ports.

2. A high-voltage, large-capacity self-lubricating motor according to claim 1, characterized in that: The first windshield, the second windshield and the third windshield are all made of steel plates with sound-absorbing cotton attached.

3. A high-voltage, large-capacity self-lubricating motor according to claim 1, characterized in that: The bearings of the non-axle extension end bearing device and the shaft extension end bearing device are both DQ9S-80B self-lubricating bearings.

Images