Motor bearing lubricating grease replacement structure and motor

Abstract

According to the motor bearing lubricating grease replacement structure and the motor provided by the invention, the lubricating grease injection pipeline is communicated with the oil inlet hole of the outer gland, instrument air with a certain pressure is introduced into the lubricating grease injection pipeline, old lubricating grease on the bearing box and the motor bearing is purged and cleaned, and the outflow state of the lubricating grease is observed at the oil discharge hole; and observing the running temperature of the motor bearing to determine the cleaning completion condition of the bearing grease. After the lubricating grease is cleaned, according to the structures of the bearing box and the motor bearing, quantitative lubricating grease is selected, the lubricating grease is sprayed into the bearing inner ring and the bearing outer ring of the motor bearing from the oil inlet hole through certain pressure, and meanwhile, the running temperature of the motor bearing is observed so as to determine the lubricating grease injection completion condition of the motor bearing. Therefore, through the arrangement of the inner gland, the outer gland and the oil spraying disc, old lubricating grease can be purged and cleaned, and new lubricating grease can be injected to lubricate and cool a motor bearing.

Description

Technical Field

[0001] The invention relates to the technical field of electric motors, and in particular to a structure for replacing lubricating grease for a motor bearing and a motor. Background Art

[0002] High-voltage increased safety three-phase asynchronous motor is a special motor, mainly used for safe operation in an environment containing explosive gas. This motor uses a series of additional measures to ensure that no dangerous temperature, arc and spark will be generated during normal operation or specified abnormal conditions, thereby preventing explosion accidents. With the accelerated development of the petroleum, electric power and chemical industries, various high-voltage increased safety three-phase asynchronous high-efficiency energy-saving motor technologies are becoming increasingly mature, with the advantages of low equipment procurement costs and long equipment operation cycles.

[0003] Bearings are an important part of motors. Their main function is to support mechanical rotating bodies, reduce the friction coefficient during their movement, and ensure their rotation accuracy. In the normal operation of motors, it is necessary to ensure that bearings can play a normal lubricating role. During the normal operation of motors, the grease will become dirty or reduced over time, so the grease needs to be replaced in time. However, when replacing the bearing grease, the new lubricant oil can only be observed to flow out when the grease is replaced successfully. In the test of the automatic oil filling experiment of the bearings of the common Y2 series motors, although the automatic oil filling of the bearings is realized, the removal of the new oil cannot be observed intuitively. It is necessary to remove the oil plug at the end of the oil circuit in the shutdown state before observation. Considering that the motor cannot be shut down for a long time under normal conditions, it is necessary to accurately judge whether the grease replacement is thorough without stopping the motor. At the same time, when filling the bearings with oil, there are two problems due to the use of oiling machines. First, due to the pressure, the grease will pass through the gaps between the parts and enter the inner cavity of the motor, causing the motor temperature to rise too high and damage the motor. Second, due to excessive oil filling, the motor temperature rises too high and damages the motor. Third, automatic oil leakage cannot be achieved.

[0004] Therefore, it is necessary to design a motor bearing grease replacement structure and a motor to solve the problem that the motor bearing temperature rises easily during the operation, maintenance and grease replacement process of the high-voltage increased safety three-phase asynchronous motor. Summary of the invention

[0005] In view of the shortcomings of the prior art mentioned above, the purpose of the present invention is to provide a motor bearing grease replacement structure and a motor, which has the function of cleaning the grease in the bearing with a long operating cycle and controlling the amount of grease entering the bearing, so as to ensure the quality of the replaced grease and reduce the occurrence of bearing temperature increase caused by the bearing grease replacement process, so as to ensure the long-term safe operation of the motor bearing.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the present invention provides a motor bearing grease replacement structure, comprising:

[0007] A bearing unit, the bearing unit comprising a motor bearing and a bearing box, the motor bearing being press-fitted into an inner cavity of the bearing box;

[0008] An outer pressure cover, the outer pressure cover is installed on one side of the bearing box, an oil inlet hole is opened on the upper part of the outer pressure cover, an oil discharge hole is opened on the lower part of the outer pressure cover, and the oil discharge hole is connected to one end of the inner cavity of the bearing box;

[0009] An inner pressure cover, the inner pressure cover is installed on the other side of the bearing box, an oil outlet hole is opened on the upper part of the inner pressure cover, and the oil inlet hole and the oil outlet hole are connected through the oil hole of the bearing box;

[0010] An oil spray plate is installed on a side of the inner pressure cover close to the bearing box. An oil spray hole is opened on the oil spray plate. One end of the oil spray hole is connected to the oil outlet hole, and the other end of the oil spray hole is connected to the inner cavity.

[0011] In a preferred embodiment of the present invention, an annular boss is provided at one end of the outer pressure cover and the inner pressure cover close to the inner cavity, and two sides of the outer ring of the motor bearing respectively abut against the annular boss.

[0012] In a preferred embodiment of the present invention, a grease accumulation groove is provided at the lower portion of the outer pressure cover between the annular boss and the axial hole thereof, and the grease accumulation groove is communicated with the oil drain hole.

[0013] In a preferred embodiment of the present invention, a rectangular groove is formed at the oil inlet hole on one side of the outer pressure cover close to the inner cavity, and an O-ring cooperates with the rectangular groove to achieve sealing between the outer pressure cover and the bearing box.

[0014] In a preferred embodiment of the present invention, a rectangular groove is formed at the oil outlet hole of the inner pressure cover near one end of the inner cavity, and an O-ring cooperates with the rectangular groove to achieve sealing between the inner pressure cover and the bearing box.

[0015] In a preferred embodiment of the present invention, a mounting groove is provided on the inner pressure cover between the annular boss and its axial hole, the oil spray disc is arranged in the mounting groove by means of a retaining spring, and the sealing between the oil spray disc and the inner pressure cover is achieved by an O-ring.

[0016] In a preferred embodiment of the present invention, the oil spray holes are evenly arranged on the oil spray plate, one end of each of the oil spray holes connected to the inner cavity is a trumpet-shaped nozzle, and one end of each of the oil spray holes connected to the oil outlet hole is a rectangular oil groove.

[0017] In a preferred embodiment of the present invention, a recovery box is connected to the orifice of the oil drain hole, and a pull-out grease accumulation box is provided on the recovery box.

[0018] In a preferred embodiment of the present invention, a plurality of small rectangular grooves are continuously formed on the hole walls of the shaft holes of the outer pressure cover and the inner pressure cover for sealing between the outer pressure cover and the inner pressure cover and the motor rotor respectively.

[0019] In order to achieve the objectives of the present invention and other related objectives, the present invention also provides an electric motor, including a motor body, wherein the driving end and the tail end of the motor rotor of the motor body are respectively installed with the motor bearing replacement grease structure, and the bearing box of each grease structure is fixedly connected to the motor housing of the motor body.

[0020] The present invention at least includes the following beneficial technical effects:

[0021] The present invention provides a motor bearing grease replacement structure and a motor, which are connected to the oil inlet of the outer pressure cover through a grease injection pipeline, and a certain pressure of instrument air is introduced into the grease injection pipeline to blow and clean the old grease on the bearing box and the motor bearing, and observe the grease outflow state at the oil drain hole, and observe the operating temperature of the motor bearing to determine the completion of the bearing grease cleaning. After the grease is cleaned, a certain amount of grease is selected according to the structure of the bearing box and the motor bearing, and the grease is sprayed from the oil inlet hole to the inner ring and outer ring of the motor bearing at a certain pressure, and the operating temperature of the motor bearing is observed to determine the completion of the motor bearing grease injection. Therefore, the present invention can achieve the blowing and cleaning of old grease and the injection of new grease to lubricate and cool the motor bearings through the arrangement of the inner pressure cover, the outer pressure cover and the oil spray plate.

[0022] The oil spray plate of the present invention can effectively distribute the grease of a certain pressure evenly to the parts that need lubrication, ensuring that each area is fully lubricated and reducing friction and wear. The oil drain hole and the oil inlet hole are respectively arranged at both ends of the inner cavity of the bearing box, so that the old grease can be fully discharged during purging and cleaning. When new grease is injected, the new grease fully flows through the motor bearing and flows out through the oil drain hole. The grease that flows out can reflect the operating temperature of the motor bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a motor bearing grease replacement structure and a motor provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the structure of an inner gland provided by an embodiment of the present invention;

[0026] Figure 3 A top view of an inner gland provided in one embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the structure of an oil spray plate provided in one embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the structure of an outer gland provided in one embodiment of the present invention;

[0029] Figure 6 A top view of an outer gland provided in one embodiment of the present invention;

[0030] Figure 7 A schematic diagram of a recovery box and a fat accumulation box provided in one embodiment of the present invention.

[0031] Among them, 1-bearing unit; 11-motor bearing; 12-bearing box; 2-external pressure cover; 21-oil inlet hole; 22-oil drain hole; 3-inner pressure cover; 31-oil outlet hole; 121-oil hole; 4-injection plate; 41-injection hole; 30-annular boss; 20-grease accumulation groove; 50-O-ring; 32-mounting groove; 411-nozzle; 412-rectangular oil groove; 24-recovery box; 25-grease accumulation box; 61-motor rotor; 611-driving end; 612-tail end; 62-motor housing; 63-motor rotor; 64-external fan. DETAILED DESCRIPTION

[0032] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0033] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and thus the illustrations only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0034] See also Figure 1 The present invention provides a motor bearing grease replacement structure, comprising a bearing unit, an outer pressure cover 2, an inner pressure cover 3 and an oil spray plate 4. The bearing unit comprises a motor bearing 11 and a bearing box 12, wherein the motor bearing 11 is press-fitted into the inner cavity of the bearing box 12; the outer pressure cover 2 is mounted on one side of the bearing box 12, an oil inlet hole 21 is provided at the upper portion of the outer pressure cover 2, and an oil discharge hole 22 is provided at the lower portion thereof, and the oil discharge hole 22 is connected to the inner cavity of the bearing box 12; the inner pressure cover 3 is mounted on the other side of the bearing box 12, an oil outlet hole 31 is provided at the upper portion of the inner pressure cover 3, and the oil inlet hole 21 and the oil outlet hole 31 are connected through the oil hole 121 of the bearing box 12; the oil spray plate 4 is mounted on one side of the inner pressure cover 3 close to the bearing box 12, an oil spray hole 41 is provided on the oil spray plate 4, one end of the oil spray hole 41 is connected to the oil outlet hole 31, and the other end of the oil spray hole 41 is connected to the inner cavity.

[0035] Further, it can be understood that when the outer gland 2 is installed on the outer side of the bearing box 12 and the inner gland 3 is installed on the inner side of the bearing box 12, the outer side of the bearing box 12 refers to the outer side of the motor housing 62, and the inner side of the bearing box 12 refers to the inner side of the motor housing 62. The oil drain hole 22 and the oil injection hole 41 are respectively connected to the inner cavity of the bearing box 12, and the connection positions are respectively located on opposite sides of the inner cavity.

[0036] The inner cavity of the bearing box 12 is cylindrical, and the inner diameter and depth are designed according to the specifications of the motor bearing 11 to ensure that the bearing is firmly fixed and provide sufficient lubrication space. Its main function is to contain grease to ensure effective lubrication of the motor bearing 11 during operation and maintain a stable operating temperature. The inner cavity is in close contact with the motor bearing 11, and at the same time, an oil hole is provided on the bearing box 12, which is connected to the oil inlet hole 21 of the outer pressure cover 2 and the oil outlet hole 31 of the inner pressure cover 3 to ensure smooth flow and replacement of grease. In addition, the design of the inner cavity takes sealing into consideration to prevent grease leakage, and the material is made of wear-resistant material to extend the service life, which can withstand the force generated by the motor rotor 6361 at high speed.

[0037] The grease replacement structure of the motor bearing 11 of the present invention is connected to the oil inlet 21 of the outer pressure cover 2 through the grease injection pipeline, and a certain pressure of instrument air is introduced into the grease injection pipeline to blow and clean the old grease on the bearing box 12 and the motor bearing 11, and the grease outflow state is observed at the oil drain hole 22, and the operating temperature of the motor bearing 11 is observed to determine the completion of the bearing grease cleaning. After the grease is cleaned, according to the structure of the bearing box 12 and the motor bearing 11, a certain amount of grease is selected, and the grease is sprayed from the oil inlet 21 into the inner bearing and the outer ring of the bearing of the motor bearing 11 through a certain pressure, and the operating temperature of the motor bearing 11 is observed to determine the completion of the grease injection of the motor bearing 11. In the process of cleaning the grease and injecting new grease, the state of the grease flowing out can be observed through the oil drain hole 22. For example, if the temperature of the newly injected grease is high when it flows out, it may indicate that there is a heat accumulation problem in the bearing, and further inspection is required.

[0038] Therefore, the present invention can achieve purging and cleaning of old grease and injection of new grease to lubricate and cool down the motor bearings through the arrangement of the inner pressure cover 3, the outer pressure cover 2 and the oil spray plate 4. The oil spray plate 4 can effectively distribute grease of a certain pressure evenly to the parts that need lubrication, ensuring that each area is fully lubricated and reducing friction and wear. The oil drain hole 22 and the oil inlet hole 21 are respectively arranged at both ends of the inner cavity of the bearing box 12, so that the old grease is fully discharged during purging and cleaning. When injecting new grease, the new grease fully flows through the motor bearing 11 and flows out through the oil drain hole 22. The grease that flows out can reflect the operating temperature of the motor bearing 11.

[0039] See also Figure 7 In a preferred embodiment of the present invention, an annular boss 30 is provided at one end of the outer cover 2 and the inner cover 3 close to the inner cavity, and the two ends of the outer ring of the motor bearing 11 respectively abut against the annular boss 30. A grease accumulation groove 20 is provided at the lower part of the outer cover 2 between the annular boss 30 and its axial hole, and the grease accumulation groove 20 is connected to the oil drain hole 22. A rectangular groove is provided at the oil inlet hole 21 of the outer cover 2 close to one end of the inner cavity, and the O-ring 50 cooperates with the rectangular groove to achieve sealing between the outer cover 2 and the bearing box 12. A recovery box 24 is connected to the orifice of the oil drain hole 22, and a pull-out grease accumulation box 25 is provided on the recovery box 24.

[0040] See also Figure 5 and Figure 6It should be noted that the outer pressure cover 2 is a disc structure. An internal threaded stepped hole is designed and processed at the top of the outer diameter of the disc. First, a drill bit with a diameter of b1 is used for drilling. The diameter of the b1 hole is the same as the diameter of the oil hole 121 of the bearing box 12. The hole depth is h1, and the depth of the hole should be lower than or equal to the center line of the oil hole 121 of the bearing box 12; secondly, the hole is enlarged at the location of the hole drilled with a diameter of b1, and a drill bit with a diameter of b2 is used for enlarging the hole. The hole depth is h2, and the b2 hole is tapped, which is mainly used to install the joint of the grease injection pipeline; the oil drain hole 22 for draining grease is designed and processed at the bottom of the outer diameter of the disc. First, A plane is processed at the bottom of the outer pressure cover 2 (outer diameter), and a rectangular oil drain hole 22 is designed and processed in the middle of the plane. The oil drain hole 22 is communicated with the inner end face of the outer pressure cover 2, and is mainly used to remove the waste and excess grease in the bearing box 12 to reduce the operating temperature of the motor bearing 11; according to the structure and size of the oil drain hole 22, N blind holes are designed and processed on the four sides outside the oil drain hole 22 and the holes are tapped, which are mainly used for installing bolts, and the recovery box 24 is connected and fixed to the outer pressure cover 2 by bolts.

[0041] According to the position and size of the top hole of the outer diameter of the outer cover 2 and the oil hole 121 of the bearing box 12, a hole is drilled on the outer cover 2 (inner end face). The hole diameter is consistent with the diameter size of the oil hole 121 of the bearing box 12, and the drilling depth should be greater than or equal to the depth of the radial drilling centerline; according to the outer position of the hole drilled on the inner end face of the outer cover 2, a rectangular groove is designed and processed, and an O-ring 50 is installed in the groove, which is mainly used to improve the sealing ability between the outer cover 2 and the bearing box 12.

[0042] According to the inner diameter size of the bearing box 12 and the outer diameter inner diameter size of the motor bearing 11, the straight-mouth boss of the outer pressure cover 2 (inner end face) is designed and processed. The outer diameter of the boss matches the inner diameter of the bearing box 12, and the fitting tolerance is a small clearance fit, which is mainly used for the radial positioning of the outer pressure cover 2 and the bearing box 12; the end face (height) size of the boss matches the depth size of the outer ring of the motor bearing 11 installed on the end face of the bearing box 12, and the fitting tolerance is a clearance fit, which is mainly used for the axial positioning of the motor bearing 11; the inner diameter size of the boss should be greater than or equal to the inner diameter size of the outer ring.

[0043] According to the structure and size of the rectangular hole at the bottom of the outer diameter of the outer cover 2, a grease accumulation groove 20 is designed and processed between the straight-mouth boss and the inner diameter of the outer cover 2, which is mainly used to remove waste and excess grease in the bearing box 12 and reduce the operating temperature of the motor bearing 11.

[0044] In a preferred embodiment of the present invention, a rectangular groove is provided at the oil outlet hole 31 at one end of the inner cavity of the inner gland 3, and the O-ring 50 cooperates with the rectangular groove to achieve sealing between the inner gland 3 and the bearing box 12. A mounting groove 32 is provided on the inner gland 3 between the annular boss 30 and its shaft hole, and the oil spray disc 4 is arranged in the mounting groove 32 through a retaining spring, and the sealing between the oil spray disc 4 and the inner gland 3 is achieved through the O-ring 50.

[0045] It should be noted that the seal between the oil injection plate 4 and the inner gland 3, the seal between the inner gland 3 and the bearing box 12, and the seal between the outer gland 2 and the bearing box 12 are all achieved by the O-ring 50. This is because the circular cross-section design of the O-ring 50 allows it to fully fit on the contact surface of the connector during compression, forming a firm sealing effect and effectively preventing the leakage of liquid or gas. Specifically, the O-ring 50 can maintain good sealing performance under certain pressure conditions and is suitable for a variety of high-pressure environments, such as hydraulic systems and pneumatic systems. The O-ring 50 can be used for a variety of materials, such as rubber, fluororubber, silicone rubber, etc., and the O-rings 50 of different materials can adapt to different chemical media, temperatures and environmental conditions. The design of the O-ring makes it very easy to install on the connector. Usually, it only needs to be simply pressed in or placed to complete the sealing structure, reducing assembly time and difficulty. The cost of the O-ring 50 is generally low, and the material can be selected according to needs, so that a good sealing effect can be obtained with a small investment, reducing production and maintenance costs. Under normal use conditions, the O-ring 50 has good durability and aging resistance, and can provide a long-term sealing effect, thereby ensuring the safe and reliable operation of the equipment. By forming an effective seal, the O-ring 50 can prevent external contaminants (such as dust and moisture) from entering the interior of the equipment, protect the integrity of internal components, and extend the service life of the equipment.

[0046] See also Figure 2 and Figure 3 It should be noted that the inner pressure cover 3 is a disc structure, and an internal threaded step hole is designed and processed at the top of the outer diameter of the inner pressure cover 3. First, a drill bit with a diameter of b1 is used for drilling. The diameter of the b1 hole is the same as the diameter of the oil hole 121 of the bearing box 12. The depth of the hole should be at the center line of the rolling element of the motor bearing 11; secondly, the hole is expanded and tapped at the location of the b1 hole, which is mainly used for installing a screw plug. N threaded holes are designed and processed on the inner pressure cover 3 (outer end face). The threaded hole diameter is the same as the threaded hole diameter of the outer end face of the bearing box 12, which is mainly used for the installation and fixation of the inner pressure cover 3 and the bearing box 12.

[0047] According to the structure and size of the top hole of the outer diameter of the inner pressure cover 3 and the oil hole of the bearing box 12, a hole is drilled on the inner pressure cover 3 (inner end face), and the hole diameter is consistent with the diameter of the oil hole 121 of the bearing box 12, and the drilling depth should be greater than or equal to the depth of the radial drilling center line; on the outside of the hole drilled on the inner end face of the inner pressure cover 3, a rectangular groove (O-ring) is designed and processed. The rectangular groove structure is the same as that of the outer pressure cover 2 and is not described here; according to the installation position of the motor bearing 11 in the bearing box 12 and the inner diameter size of the bearing box 12, a straight-mouth boss of the inner pressure cover 3 (inner end face) is designed and processed. The outer diameter of the boss matches the inner diameter of the bearing box 12, and the matching tolerance is a smaller clearance match, which is mainly used for radial positioning of the inner pressure cover 3 and the bearing box 12; the end face (height) size of the boss is consistent with the inner diameter of the bearing box 12. The outer ring of the motor bearing 11 is installed on the end face of the bearing box 12 with a depth dimension that matches the end face, and the matching tolerance is a clearance fit, which is mainly used for the axial positioning of the motor bearing 11; the inner diameter dimension of the boss should be greater than or equal to the inner diameter dimension of the outer ring; according to the center distance of the rolling element of the motor bearing 11 and the radial drilling depth position, a straight-mouthed stepped rectangular groove is designed and processed on the inner pressure cover 3 (inner end face), and two rectangular grooves are designed and processed on the inner diameter of the rectangular groove and the inner end of the outer diameter of the rectangular groove, respectively. An O-ring 50 is installed in the groove, which is mainly used for sealing between the injection disc 4 and the inner pressure cover 3; according to the structure and size of the injection disc 4 installed on the inner pressure cover 3, a rectangular groove is designed and processed on the inner diameter of the straight-mouthed boss of the inner pressure cover 3, and a retaining ring is installed in the groove, and the injection disc 4 is axially fixed through the retaining ring.

[0048] In a preferred embodiment of the present invention, the fuel injection plate 4 is evenly provided with fuel injection holes 41 , one end of each fuel injection hole 41 connected to the inner cavity is a trumpet-shaped nozzle 411 , and one end of each fuel injection hole 41 connected to the oil outlet hole 31 is a rectangular oil groove 412 .

[0049] See also Figure 4 It should be noted that the oil spray plate 4 is designed and processed according to the structure and size of the inner pressure cover 3, and the oil spray plate 4 is a straight-mouthed stepped circular ring structure. The oil spray plate 4 is arranged in the mounting groove 32 of the inner pressure cover 3 through the retaining spring, and the sealing between the oil spray plate 4 and the inner pressure cover 3 is achieved through the O-ring 50. The rectangular oil groove 412 at one end of the oil spray hole 41 is mainly used to transport grease, and the nozzle 411 at the other end is a trumpet-shaped structure. The large end of the nozzle 411 faces the inner cavity of the bearing box 12. The grease of a certain pressure is sprayed into the rolling element, inner ring and outer ring raceway of the motor bearing 11 through the nozzle 411, so as to fully lubricate the motor bearing 11 and reduce the amount of grease.

[0050] The oil spray disc 4 can effectively disperse and spray lubricating oil onto the friction surface, ensuring that the lubricating oil is evenly covered, thereby achieving the best lubrication effect and reducing friction and wear. By spraying lubricating oil, the oil spray disc 4 not only provides lubrication, but also takes away the heat generated by mechanical parts, keeps the equipment within a more ideal operating temperature range, and reduces the risk of failure due to overheating. The effective lubrication of the oil spray disc 4 can extend the service life of the equipment, reduce the frequency of failures, thereby reducing the cost of repairs and replacement parts, and saving maintenance expenses in long-term operations. The oil spray disc 4 can also use the lubricating oil efficiently by precisely controlling the amount of oil sprayed, reducing unnecessary oil consumption and waste, improving the overall oil utilization rate, and reducing operating costs.

[0051] In a preferred embodiment of the present invention, a plurality of small rectangular grooves are continuously formed on the wall of the axial holes of the outer pressure cover 2 and the inner pressure cover 3 for sealing between the outer pressure cover 2 and the inner pressure cover 3 and the motor rotor 6361 respectively.

[0052] It should be noted that the inner diameter of the outer pressure cover 2 is designed and processed with N small rectangular grooves, and its inner diameter matches the shaft diameter of the motor rotor 6361, and the matching tolerance is a clearance fit, which is mainly used for sealing between the outer pressure cover 2 and the shaft diameter of the motor rotor 6361; the N rectangular grooves form a labyrinth seal structure to prevent the leakage of grease and instrument air in the bearing box 12. The inner diameter of the inner pressure cover 3 is designed and processed with N small rectangular grooves, and its inner diameter matches the shaft diameter of the motor rotor 6361, and the matching tolerance is a clearance fit, which is mainly used for sealing between the inner pressure cover 3 and the shaft diameter of the motor rotor 6361, and the design of the small rectangular grooves is the same as that of the outer pressure cover 2.

[0053] In order to achieve the purpose of the present invention and other related purposes, the present invention also provides an electric motor, including a motor body, a driving end 611 and a tail end 612 of a motor rotor 6361 of the motor body, respectively equipped with a motor bearing 11 replacement grease structure, and a bearing box 12 of each grease structure is fixedly connected to the motor housing 62 of the motor body.

[0054] Furthermore, the motor body includes a motor rotor 6361, a motor stator and a motor housing 62. The motor rotor 6361 and the motor stator are both installed in the motor housing 62. An air cooler is installed at the upper end of the motor housing 62. An external fan 64 is provided at the tail end 612 of the motor rotor 6361.

[0055] During the routine maintenance and grease adding process of a motor bearing 11 in a chemical plant, the motor bearing 11 is prone to high operating temperature. It is necessary to add an external cooling fan to cool the motor bearing 11 and observe the temperature change of the motor bearing 11, which affects the long-term safe operation of the motor bearing 11. After designing and processing a structure for replacing grease of the motor bearing 11 of the present invention, during the routine maintenance (without stopping the machine) of greasing the motor bearing 11, the aging and old grease in the bearing box 12 is swept and cleaned, and new grease is quantitatively added, so as to avoid the occurrence of the phenomenon of the bearing temperature of the motor bearing 11 rising during the grease adding process and extend the motor operation cycle.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

[0057] In the description herein, many specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of the specific details or with other devices, systems, components, methods, components, materials, parts, etc. In other cases, well-known structures, materials, or operations are not specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0058] References throughout this specification to "one embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention, and not necessarily in all embodiments. Thus, various appearances of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout this specification do not necessarily refer to the same embodiment. In addition, the particular features, structures, or characteristics of any specific embodiment of the invention may be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the invention described and illustrated herein may be possible in light of the teachings herein and are to be considered part of the spirit and scope of the invention.

[0059] It should also be understood that one or more of the elements shown in the figures may also be implemented in a more separate or more integrated manner, or even removed because they are inoperable in certain circumstances or provided because they may be useful depending on the application.

[0060] In addition, unless otherwise explicitly indicated, any marking arrows in the drawings should be regarded as exemplary only and not limiting. In addition, unless otherwise indicated, the term "or" used herein is generally intended to mean "and / or". In the case where the term is not clear because it is anticipated that the ability to separate or combine is provided, the combination of components or steps will also be regarded as indicated.

[0061] As used in the description herein and throughout the claims that follow, "a", "an", and "the" include plural references unless otherwise indicated. Likewise, as used in the description herein and throughout the claims that follow, the meaning of "in" includes "in" and "on" unless otherwise indicated.

[0062] The above description of the illustrated embodiments of the present invention (including the contents described in the Abstract) is not intended to be an exhaustive list or to limit the present invention to the precise form disclosed herein. Although specific embodiments of the present invention and examples of the present invention are described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the present invention as will be recognized and appreciated by those skilled in the art. As noted, these modifications may be made to the present invention in accordance with the above description of the embodiments described in the present invention, and these modifications will be within the spirit and scope of the present invention.

[0063] Systems and methods have been generally described herein as details that aid in understanding the present invention. In addition, various specific details have been given to provide an overall understanding of embodiments of the present invention. However, those skilled in the relevant art will recognize that embodiments of the present invention may be practiced without one or more of the specific details, or may be practiced using other devices, systems, accessories, methods, components, materials, parts, etc. In other cases, well-known structures, materials, and / or operations are not specifically shown or described in detail to avoid confusion with various aspects of embodiments of the present invention.

[0064] Thus, although the invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the foregoing disclosure, and it should be understood that in some cases, some features of the invention will be employed without the corresponding use of other features without departing from the scope and spirit of the proposed invention. Thus, many modifications may be made to adapt a particular environment or material to the essential scope and spirit of the invention. The invention is not intended to be limited to the specific terms used in the claims below and / or the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but the invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Thus, the scope of the invention will be determined solely by the appended claims.

Claims

1. A motor bearing grease replacement structure, characterized in that: include: A bearing unit, the bearing unit comprising a motor bearing and a bearing box, the motor bearing being press-fitted into an inner cavity of the bearing box; An outer pressure cover, the outer pressure cover is installed on one side of the bearing box, an oil inlet hole is opened on the upper part of the outer pressure cover, an oil discharge hole is opened on the lower part of the outer pressure cover, and the oil discharge hole is connected to the inner cavity of the bearing box; An inner pressure cover, the inner pressure cover is installed on the other side of the bearing box, an oil outlet hole is opened on the upper part of the inner pressure cover, and the oil inlet hole and the oil outlet hole are connected through the oil hole of the bearing box; An oil spray plate is installed on a side of the inner pressure cover close to the bearing box. An oil spray hole is opened on the oil spray plate. One end of the oil spray hole is connected to the oil outlet hole, and the other end of the oil spray hole is connected to the inner cavity.

2. The motor bearing grease replacement structure according to claim 1, characterized in that: An annular boss is disposed at one end of the outer pressure cover and the inner pressure cover close to the inner cavity, and two sides of the outer ring of the motor bearing respectively abut against the annular boss.

3. The motor bearing grease replacement structure according to claim 2, characterized in that: A grease accumulation groove is provided at the lower part of the outer pressure cover between the annular boss and the axial hole thereof, and the grease accumulation groove is communicated with the oil drain hole.

4. The motor bearing grease replacement structure according to claim 3, characterized in that: A rectangular groove is provided at the oil inlet hole on one side of the outer pressure cover close to the inner cavity, and an O-ring cooperates with the rectangular groove to achieve sealing between the outer pressure cover and the bearing box.

5. The motor bearing grease replacement structure according to claim 4, characterized in that: A rectangular groove is provided at the oil outlet hole of the inner pressure cover near one end of the inner cavity, and an O-ring cooperates with the rectangular groove to achieve sealing between the inner pressure cover and the bearing box.

6. The motor bearing grease replacement structure according to claim 5, characterized in that: The inner pressure cover is provided with a mounting groove between the annular boss and its axial hole, the oil spray disc is arranged in the mounting groove through a retaining spring, and the sealing between the oil spray disc and the inner pressure cover is achieved through an O-ring.

7. The motor bearing grease replacement structure according to claim 6, characterized in that: The oil spray holes are evenly arranged on the oil spray plate, one end of each of the oil spray holes connected to the inner cavity is a trumpet-shaped nozzle, and one end of each of the oil spray holes connected to the oil outlet hole is a rectangular oil groove.

8. The motor bearing grease replacement structure according to claim 7, characterized in that: A recovery box is connected to the orifice of the oil drain hole, and a pull-out grease accumulation box is provided on the recovery box.

9. The motor bearing grease replacement structure according to claim 8, characterized in that: A plurality of small rectangular grooves are continuously formed on the hole walls of the shaft holes of the outer pressure cover and the inner pressure cover, which are used for sealing between the outer pressure cover and the inner pressure cover and the motor rotor respectively.

10. An electric motor, comprising a motor body, characterized in that: The driving end and the tail end of the motor rotor of the motor body are respectively installed with the motor bearing replacement grease structure as described in claims 1-9, and the bearing box of each grease structure is fixedly connected to the motor housing of the motor body.

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