Novel bearing with welding rib water-cooling end cover

Abstract

The utility model discloses a novel bearing with a welding rib water cooling end cover, which comprises an end cover body connected with a base, an end cover water channel communicated with a base water channel is arranged on the end cover body, and a plurality of radiating ribs are arranged on the inner side of the end cover body; a bearing assembly is further coaxially arranged on the end cover body in a penetrating mode, a bearing limiting device is arranged at the front end of the bearing assembly, and a bearing isolation device is further arranged in the bearing assembly. According to the utility model, the heat dissipation effect of the motor end cover can be effectively improved, so that the problems of high temperature and easy damage of the bearing of the existing coal mine underground motor are solved.

Description

Technical Field

[0001] The utility model relates to the field of motor bearings, in particular to a novel bearing with a welded rib water-cooled end cover. Background Art

[0002] Affected by the conditions of underground coal mine tunnels and coal seams, the ventilation and heat dissipation conditions of underground equipment are poor, and the environment is humid, dusty and coal dust-prone. Therefore, underground coal mine mining equipment (such as coal mining machines, roadheaders, conveyors, etc.) mostly use flameproof three-phase asynchronous motors, which have the characteristics of small motor size, high power density and high temperature rise, and are suitable for underground coal mine operations.

[0003] Due to the demand for increased power supply voltage, the original motor supply voltage has been increased from 3300V to 6000V or 10000V. After the voltage is increased, the winding insulation becomes thicker, which leads to increased heat generation in the motor and temperature accumulation at the winding end, resulting in high bearing temperature and easy damage to the bearing, which brings great trouble to the reliable operation of the equipment.

[0004] In order to effectively solve the problems of high bearing temperature and easy damage of existing underground motors in coal mines, the utility model patent with patent number 202222567309.1 and the name of "A new bearing device with water-cooled end cover with heat dissipation ribs for motors" discloses the following technical solution: it includes a water-cooled end cover body and an outer water channel and an inner water channel arranged on the water-cooled end cover body. The outer water channel and the inner water channel are connected. An outer water channel cover plate is correspondingly provided on the outer side of the outer water channel, and an inner water channel cover plate is also correspondingly provided on the inner water channel, and heat dissipation ribs are provided on the inner water channel cover plate; and a sealing ring groove is provided at the joint between the bearing outer cover and the end cover to reduce the risk of grease contamination.

[0005] In the above technical solution, the heat dissipation ribs are arranged in multiple uniform circular ring grooves on the water channel cover plate. The circular ring grooves are not easy to process, and the ring grooves reduce the thickness of the water-cooling cover plate, and the strength of the cover plate at the bottom of the ring grooves is reduced. When the water pressure increases, there is a risk of bulging, which poses a great safety hazard.

[0006] On the other hand, during underground coal mine operations, existing flameproof three-phase asynchronous motors still have the following technical problems:

[0007] 1. Due to the certain inclination of the mining tunnel, the bearings of the flameproof three-phase asynchronous motor are easily affected by the axial force during use, resulting in axial displacement of the bearings.

[0008] 2. Due to the humid and dusty working environment in coal mines, water vapor, dust and coal dust can easily enter the bearings from the shaft penetration, causing grease contamination and affecting the lubrication quality. This will further increase the bearing temperature, cause bearing damage and affect the reliable operation of the equipment.

[0009] 3. During the operation of underground coal mine motors, due to the large explosion-proof gap of the motor and the small oil groove of the bearing inner cover, grease can easily be discharged inward through the shaft penetration of the bearing inner cover, causing the inside of the motor cavity to be contaminated by grease, resulting in further reduction of the heat dissipation effect. Utility Model Content

[0010] The purpose of the utility model is to provide a new type of bearing with a welded rib water-cooled end cover, which can effectively improve the heat dissipation effect of the motor end cover, thereby solving the problems of high temperature and easy damage of the existing motor bearings in coal mines.

[0011] The utility model adopts the following technical solutions:

[0012] A new type of bearing with a welded rib water-cooled end cover includes an end cover body connected to a machine base, an end cover water channel connected to a machine base water channel is provided on the end cover body, and a plurality of heat dissipation ribs are provided on the inner side of the end cover body; a bearing assembly is also coaxially passed through the end cover body, a bearing limit device is provided at the front end of the bearing assembly, and a bearing isolation device is also provided inside the bearing assembly.

[0013] The end cover body comprises an annular disc body and a waterway cover plate arranged on the outside of the disc body, and an annular end cover waterway is formed between the disc body and the waterway cover plate.

[0014] A water inlet sealing ring is provided at the connection point between the end cover water channel and the machine base water channel.

[0015] The bearing assembly includes a bearing, a bearing inner cover and a bearing outer cover, and the bearing inner cover and the bearing outer cover are connected to the end cover body; the bearing is inserted into the rotating shaft holes of the bearing inner cover, the bearing outer cover and the end cover body, and a limiting sleeve is also provided in the bearing inner cover.

[0016] A limiting sleeve limiting structure is also provided on the inner side of the limiting sleeve.

[0017] The limiting structure of the limiting sleeve comprises an annular groove arranged on the inner side of the limiting sleeve along the circumferential direction, and an elastic retaining ring for the shaft is arranged in the annular groove.

[0018] A plurality of annular oil storage grooves are also provided on the outer circumferential surface of the limiting sleeve.

[0019] The bearing limiting device adopts a locking nut, and a nut retaining washer is arranged inside the locking nut.

[0020] The bearing isolation device adopts an IP67 bearing isolator.

[0021] The outer side of the bearing inner cover is also provided with a grease containing structure corresponding to the position of the bearing balls. The grease containing structure includes an annular oil storage chamber and a radial oil storage chamber. The annular oil storage chamber is arranged along the circumference of the bearing inner cover, and the radial oil storage chamber is arranged along the radial direction of the bearing inner cover on the outer side of the annular oil storage chamber and is connected to the annular oil storage chamber.

[0022] This utility model utilizes the end cap water channel, which works in conjunction with the existing base water channel to maximize the water circulation area and enhance heat dissipation. The heat dissipation ribs located within the end cap body not only enhance the structural strength of the end cap body but also further increase the heat dissipation area. The end cap water channel and the heat dissipation ribs work in conjunction with the existing base water channel and internal fan to achieve efficient heat dissipation, effectively reducing bearing temperature and preventing bearing damage.

[0023] This utility model utilizes a bearing limiter to limit axial displacement when the bearing is subjected to significant axial forces. The coordinated design of the heat dissipation ribs and the bearing limiter reduces radial impacts on the bearing while limiting axial displacement, preventing damage and improving bearing reliability.

[0024] This utility model utilizes a bearing isolation device within the bearing assembly to assist with the design of the end cap water channel and heat dissipation ribs, effectively sealing them and preventing the reduction of heat dissipation caused by grease contamination. It also assists with the coordinated design of the heat dissipation ribs and the bearing limiter, reducing bearing damage caused by grease contamination and improper lubrication. These structures work together to effectively address the issues of high shaft temperatures and bearing damage in underground coal mine motors.

[0025] This utility model utilizes a grease reservoir structure on the outside of the bearing inner cover, combined with several annular oil reservoirs on the outer end of the stop sleeve, to effectively improve the motor's oil storage and drainage channels, ensuring sufficient lubrication of the bearing and enhancing operational reliability. The inner cover and stop sleeve work together, resulting in an assembled design that facilitates assembly and disassembly, making maintenance easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the utility model;

[0027] Figure 2 This is a schematic structural diagram of the end cover body of the utility model;

[0028] Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part A;

[0029] Figure 4 for Figure 1 Schematic diagram of the enlarged structure of part B;

[0030] Figure 5 It is a structural schematic diagram of the bearing inner cover in the present utility model. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0032] Example 1:

[0033] like Figures 1 to 5 As shown, the utility model describes a new type of bearing with a welded rib water-cooled end cover, comprising an end cover body 1 connected to a machine base 2, the end cover body 1 being provided with an end cover water channel 16 connected to the water channel of the machine base 2, and a plurality of heat dissipation ribs 17 being provided on the inner side of the end cover body 1; a bearing assembly for realizing a rotational connection between the machine base 2 and the rotor shaft 27 is also coaxially penetrated on the end cover body 1, a bearing limit device is provided at the front end of the bearing assembly, and a bearing isolation device is also provided inside the bearing assembly.

[0034] In Example 1, the end cover water channel 16 can introduce cooling water through the existing water channel of the machine base 2, forming a maximized water circulation area on the end cover body 1 to enhance the heat dissipation effect.

[0035] The several heat dissipation ribs 17 arranged on the inner side of the end cover body 1 can, on the one hand, improve the structural strength of the end cover body 1 without increasing the thickness of the end cover body 1, prevent the end cover body 1 from deformation, reduce the radial impact that the bearing 3 may be subjected to, thereby protecting the structure of the bearing 3 and improving the service life of the bearing 3; on the other hand, it can also further increase the heat dissipation area, cooperate with the air cooling effect of the existing internal fan 11 in the machine base 2, and circulate the heat along the existing air circulation system to the machine base 2 and the end cover body 1 provided with the end cover water channel 16, so as to improve the heat dissipation capacity of the end cover body 1 and reduce the temperature of the bearing 3.

[0036] In Example 1, the bearing limit device at the front end of the bearing assembly is set on the rotor shaft 27, which can limit the axial displacement of the bearing 3 when the bearing 3 faces a large axial force, thereby avoiding damage to the bearing 3 and improving the operating reliability of the bearing 3.

[0037] In Example 1, the bearing isolation device provided in the bearing assembly can effectively seal the gap between the bearing assembly and the rotor shaft 27, thereby effectively isolating water vapor, dust, and coal dust outside the bearing assembly, avoiding grease contamination, reducing damage to the bearing 3 caused by grease contamination and improper lubrication, and improving the operating reliability of the bearing 3.

[0038] In Example 1, the end cover water channel 16 is used in conjunction with the heat dissipation rib 17, which can cooperate with the existing base 2 water channel and internal fan 11 in the base 2 to achieve efficient heat dissipation, thereby effectively reducing the temperature of the bearing 3 and preventing damage to the bearing 3. The coordinated design of the heat dissipation rib 17 and the bearing limit device can not only reduce the radial impact that the bearing 3 may be subjected to, but also limit the axial displacement of the bearing 3 when the bearing 3 faces a large axial force, thereby preventing damage to the bearing 3. The bearing isolation device can not only assist in the design of the end cover water channel 16 and the heat dissipation rib 17, by achieving effective sealing to prevent the reduction of heat dissipation effect caused by grease contamination, but also assist in the coordinated design of the heat dissipation rib 17 and the bearing limit device, reducing damage to the bearing 3 caused by grease contamination and improper lubrication. The above structures cooperate with each other and work together to effectively solve the problems of high shaft temperature and bearing 3 damage in underground coal mine motors.

[0039] Example 2:

[0040] like Figure 2 As shown, based on Example 1, the end cover body 1 in Example 2 includes an annular disc 18 and a waterway cover plate 15 arranged on the outside of the disc 18. An annular end cover waterway 16 is formed between the disc 18 and the waterway cover plate 15. The end cover waterway 16 is connected to the base waterway outlet and the base waterway inlet of the base 2 waterway through the end cover waterway inlet 21 and the end cover waterway outlet 22, respectively, to form an efficient waterway circulation. A water inlet sealing ring 23 is provided at the end cover waterway inlet 21 and the end cover waterway outlet 22 to ensure the sealing effect. The end cover waterway 16 is a one-way channel to prevent the waterway from being blocked due to water flow diversion.

[0041] In Example 2, several groups of heat dissipation ribs 17 are evenly arranged along the circumference of the inner side of the end cap body 1 (i.e., the side of the end cap body 1 closest to the windings 9 within the motor base 2). These ribs 17 can be welded to the end cap body 1. Working within the internal air circulation system comprised of the existing internal fan 11, air duct 12, rotor core axial ventilation duct 13, rotor core radial ventilation duct 20, stator core radial ventilation duct 19, and stator core axial ventilation duct 14 within the motor base 2, these ribs 17 effectively increase the heat dissipation area, better transferring heat from within the motor base 2 to the water circulation system. This improves the heat dissipation efficiency of the end cap body 1, reduces the temperature within the motor base 2 and at the bearings 3, and prevents the motor bearings 3 from seizing due to high temperatures.

[0042] Example 3:

[0043] like Figure 1 、 Figure 3 and Figure 4As shown, based on Example 1 or 2, the bearing assembly in Example 3 includes a bearing 3, a bearing inner cover 5, and a bearing outer cover 4. The bearing inner cover 5 and the bearing outer cover 4 are connected to the end cover body 1 via hexagonal bolts 29. The bearing 3 is inserted into the holes of the rotating shaft 27 of the bearing inner cover 5, the bearing outer cover 4, and the end cover body 1. A limiting sleeve 6 is also provided within the bearing inner cover 5 and is sleeved on the outside of the rotor rotating shaft 27. The bearing inner cover 5 and the limiting sleeve 6 are matched with a small clearance, and the limiting sleeve 6 can be a copper sleeve.

[0044] In Example 3, a retaining sleeve retaining structure is further provided on the inner side of the retaining sleeve 6 to secure the position of the retaining sleeve 6. The retaining sleeve retaining structure includes an annular groove 31 circumferentially disposed on the inner side of the retaining sleeve 6, within which a shaft circlip 24 is disposed. The cooperation between the bearing inner cover 5 and the shaft circlip 24 secures the retaining sleeve 6 to the bearing inner cover 5, preventing axial movement of the retaining sleeve 6 relative to the bearing inner cover 5.

[0045] In Example 3, a plurality of annular oil storage grooves 25 are further provided on the outer circumferential surface of the limiting sleeve 6 for storing the grease when the grease flows into the inner side of the motor to prevent excessive grease from flowing into the interior of the motor base.

[0046] In Example 3, the bearing retaining device provided at the front end of the bearing assembly can be a locking nut 8, which is threadedly connected to the rotor shaft 27. A nut retaining washer 7 is provided between the locking nut 8 and the bearing 3. Compared to the shaft circlips used in the prior art, the combination of the locking nut 8 and the nut retaining washer 7 provides a tighter fixation on the bearing 3, more effectively preventing axial slippage of the bearing 3.

[0047] In Example 3, the bearing isolation device can be an IP67 bearing isolator 10, which is disposed between the bearing outer cover 4 and the rotor shaft 27. The outer sides of the dynamic and static rings in the IP67 bearing isolator 10 can form a labyrinth seal, preventing external contaminants from entering the seal interior. This effectively prevents the grease in the bearing 3 from being contaminated by coal dust, dust, and water vapor, thereby improving the bearing lubrication effect.

[0048] Example 4:

[0049] like Figure 5 As shown, based on Example 3, a grease receiving structure corresponding to the position of the bearing ball 28 is further provided on the outer side of the bearing inner cover 5 to facilitate the smooth flow of grease into the bearing chamber and improve the lubrication effect on the bearing 3.

[0050] In Example 4, the grease containing structure includes an annular oil storage chamber 26 and a radial oil storage chamber 30. The annular oil storage chamber 26 is arranged circumferentially along the bearing inner cover 5, and the radial oil storage chamber 30 is arranged radially along the bearing inner cover 5 on the outside of the annular oil storage chamber 26 and is connected to the annular oil storage chamber 26.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A new type of bearing with a welded rib water-cooled end cover, comprising an end cover body connected to a base, characterized in that: The end cover body is provided with an end cover water channel connected to the machine base water channel, and a number of heat dissipation ribs are provided on the inner side of the end cover body; a bearing assembly is also coaxially passed through the end cover body, a bearing limit device is provided at the front end of the bearing assembly, and a bearing isolation device is also provided inside the bearing assembly.

2. The novel bearing with welded rib water-cooled end cover according to claim 1 is characterized in that: The end cover body comprises an annular disc body and a waterway cover plate arranged on the outside of the disc body, and an annular end cover waterway is formed between the disc body and the waterway cover plate.

3. The novel bearing with welded rib water-cooled end cover according to claim 1 is characterized in that: A water inlet sealing ring is provided at the connection point between the end cover water channel and the machine base water channel.

4. The novel bearing with welded rib water-cooled end cover according to claim 1 is characterized in that: The bearing assembly includes a bearing, a bearing inner cover and a bearing outer cover, and the bearing inner cover and the bearing outer cover are connected to the end cover body; the bearing is inserted into the rotating shaft holes of the bearing inner cover, the bearing outer cover and the end cover body, and a limiting sleeve is also provided in the bearing inner cover.

5. The novel bearing with welded rib water-cooled end cover according to claim 4 is characterized in that: A limiting sleeve limiting structure is also provided on the inner side of the limiting sleeve.

6. The novel bearing with welded rib water-cooled end cover according to claim 5 is characterized in that: The limiting structure of the limiting sleeve comprises an annular groove arranged on the inner side of the limiting sleeve along the circumferential direction, and an elastic retaining ring for the shaft is arranged in the annular groove.

7. The novel bearing with welded rib water-cooled end cover according to claim 4 is characterized in that: A plurality of annular oil storage grooves are also provided on the outer circumferential surface of the limiting sleeve.

8. The novel bearing with welded rib water-cooled end cover according to claim 1 is characterized in that: The bearing limiting device adopts a locking nut, and a nut retaining washer is arranged inside the locking nut.

9. The novel bearing with welded rib water-cooled end cover according to claim 1 is characterized in that: The bearing isolation device adopts an IP67 bearing isolator.

10. The novel bearing with welded rib water-cooled end cover according to claim 4, characterized in that: The outer side of the bearing inner cover is also provided with a grease containing structure corresponding to the position of the bearing balls. The grease containing structure includes an annular oil storage chamber and a radial oil storage chamber. The annular oil storage chamber is arranged along the circumference of the bearing inner cover, and the radial oil storage chamber is arranged along the radial direction of the bearing inner cover on the outer side of the annular oil storage chamber and is connected to the annular oil storage chamber.

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