Motor shaft extension sealing structure and motor

Abstract

The present invention provides a motor shaft extension sealing structure, including a motor end cover, a motor shaft, a ball bearing and a sealing ring; the motor shaft is installed in the motor end cover through the ball bearing; the sealing ring is fixedly sleeved on the motor shaft, and a gap channel for lubricating grease to pass through is formed between the sealing ring and the motor end cover; the sealing ring can be driven by the motor shaft to rotate synchronously, and there is relative rotation between the sealing ring and the end cover; an oil inlet channel and an oil outlet channel are provided in the motor end cover, the oil inlet channel is connected to the inlet end of the gap channel through the ball bearing, and the oil outlet channel is connected to the outlet end of the gap channel. The motor shaft extension sealing structure can not only ensure the lubrication of the bearing, but also ensure the sealing between the motor shaft and the motor end cover by filling the tortuous gap channel with lubricating grease, thereby reducing mechanical loss. Correspondingly, the present invention also provides a motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor shaft extension sealing structure and a motor. Background Art

[0002] Reducing the friction loss of the motor itself is an effective way to improve efficiency. At present, the protection level of ordinary high-efficiency motors is required to be IP55 or above, and the solution to the motor shaft extension sealing is generally to install a skeleton oil seal or a water ring on the outer end of the motor shaft, such as Figure 5 As shown. Although the skeleton oil seal can play a role in waterproofing and dustproofing, the interference installation increases the friction resistance of the shaft when it rotates, causing the mechanical loss of the motor to increase and increasing the temperature rise of the bearing. Although the use of the water ring protection does not increase the mechanical loss, it cannot effectively meet the protection requirements when the motor is stationary. Therefore, it is necessary to develop a motor shaft extension sealing structure with a simple structure and low mechanical loss to improve the working efficiency of the motor.

[0003] After searching, some typical prior arts were found, such as Figure 6 As shown, patent application number 201810252881.4 discloses a sealing structure for the motor shaft extension end, which can extend the service life of the oil seal and the sealing reliability. Figure 7 As shown, the patent with application number 201810988648.2 discloses a motor shaft extension sealing structure, which achieves a higher sealing protection level for thin-walled end covers and improves the sealing effect. Figure 8 As shown, the patent with application number 201710436299.9 discloses a generator bearing sealing device, which achieves the effect of reducing the volume and structural complexity of the sealing device and improving the durability of the sealing device.

[0004] It can be seen that for the motor shaft extension sealing structure, there are still many practical problems that need to be dealt with in its actual application (such as simplifying the structure, reducing mechanical losses, etc.) and no specific solutions have been proposed. Summary of the invention

[0005] In order to overcome the shortcomings of the prior art, a motor shaft extension sealing structure and a motor are provided. The specific technical solution of the present invention is as follows:

[0006] A motor shaft extension sealing structure, comprising a motor end cover, a motor shaft, a ball bearing and a sealing ring;

[0007] The motor shaft is installed in the motor end cover through a ball bearing;

[0008] The sealing ring is fixedly sleeved on the motor shaft, and a gap channel is formed between the sealing ring and the motor end cover for the lubricating grease to pass through;

[0009] The sealing ring can be driven by the motor shaft to rotate synchronously, and can rotate relative to the end cover;

[0010] An oil inlet channel and an oil outlet channel are provided in the motor end cover. The oil inlet channel is connected to the inlet end of the slit channel through a ball bearing, and the oil outlet channel is connected to the outlet end of the slit channel.

[0011] The sealing ring is installed between the motor end cover and the bearing. One end of the sealing ring is fixed on the motor shaft, and one side of the sealing ring is close to the inner ring of the ball bearing. The lubricating oil flows into the bearing through the oil inlet channel, then flows into the gap channel between the sealing ring and the motor end cover through the bearing, and finally flows out to the oil outlet channel. The use of the bearing's lubricating grease for sealing can not only ensure the lubrication of the bearing, but also fill the tortuous gap channel with the lubricating grease to ensure the sealing between the motor shaft and the motor end cover, thereby reducing mechanical loss. During installation, the ball bearing and the sealing ring can be heated at the same time, and then the motor shaft can be sleeved in the ball bearing and the sealing ring. The installation is simple.

[0012] Optionally, the slit channel is arranged in a zigzag manner to form a maze, and the gap distance of the slit channel is between 0.5 and 1.0 mm.

[0013] Optionally, the motor shaft extension sealing structure further includes a bearing cover, which is fixed on the motor end cover and forms a first channel between the bearing cover and the ball bearing and the motor end cover.

[0014] Optionally, a plurality of annular first oil storage channels are provided on the surface of the bearing cover on the side in contact with the motor shaft.

[0015] Optionally, a plurality of annular second oil storage channels are provided on the surface of the motor end cover on the side in contact with the motor shaft.

[0016] Optionally, the bearing cover is fixed on the motor end cover by bolts.

[0017] Optionally, the sealing ring is interference fit on the motor shaft.

[0018] Correspondingly, the present invention also provides a motor, which includes the motor shaft extension sealing structure described above.

[0019] The beneficial effects achieved by the present invention include:

[0020] 1. Using the lubricating grease of the bearing for sealing can not only ensure the lubrication of the bearing, but also fill the tortuous gap channel with lubricating grease to ensure the sealing between the motor shaft and the motor end cover, thus reducing mechanical loss;

[0021] 2. During installation, the ball bearing and the sealing ring can be heated at the same time, and then the motor shaft sleeve is placed between the ball bearing and the sealing ring. The installation is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The invention may be further understood from the following description taken in conjunction with the accompanying drawings, with emphasis placed on illustrating the principles of the embodiments.

[0023] Figure 1 It is a schematic diagram of the overall structure of a motor shaft extension sealing structure in an embodiment of the present invention;

[0024] Figure 2 It is a schematic diagram of the overall structure of another motor shaft extension sealing structure in an embodiment of the present invention;

[0025] Figure 3 The overall structure of the sealing ring in the embodiment of the present invention is shown in FIG. Figure 1 ;

[0026] Figure 4 The overall structure of the sealing ring in the embodiment of the present invention is shown in FIG. Figure 2 ;

[0027] Figure 5 It is a structural schematic diagram of the prior art in which the motor shaft extension is sealed by a skeleton oil seal;

[0028] Figure 6 It is a structural schematic diagram of a sealing structure of a motor shaft extension end in the prior art;

[0029] Figure 7 It is a structural schematic diagram of a motor shaft extension sealing structure in the prior art;

[0030] Figure 8 The present invention is a schematic structural diagram of a generator bearing sealing device in the prior art.

[0031] Description of reference numerals: 1. motor end cover; 2. motor shaft; 3. ball bearing; 4. sealing ring; 5. oil inlet channel; 6. oil outlet channel; 7. gap channel; 8. bearing cover; 9. first oil storage channel; 10. second oil storage channel; 11. bolt; 12. memory metal sheet; 13. chamber; DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with its embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. For those skilled in the art, other systems, methods and / or features of the present embodiment will become apparent after reviewing the following detailed description. It is intended that all such additional systems, methods, features and advantages are included in this specification, included within the scope of the present invention, and protected by the appended claims. Additional features of the disclosed embodiments are described in the following detailed description, and these features will be apparent from the following detailed description.

[0033] The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left",

[0034] The directions or positional relationships indicated by "right" and the like are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the accompanying drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The present invention is a motor shaft extension sealing structure and a motor, and the following embodiments are described according to the accompanying drawings:

[0036] Embodiment 1:

[0037] Reducing the friction loss of the motor itself is an effective way to improve efficiency. At present, the protection level of ordinary high-efficiency motors is required to be IP55 or above. The second solution to the motor shaft extension sealing is generally to set a skeleton oil seal or a water ring on the outer end of the motor shaft 2, such as Figure 4 As shown. Although the skeleton oil seal can play a role in waterproofing and dustproofing, the interference installation increases the friction resistance of the shaft when it rotates, causing the mechanical loss of the motor to increase and increasing the temperature rise of the bearing. Although the use of the water ring protection does not increase the mechanical loss, it cannot effectively meet the protection requirements when the motor is stationary. Therefore, it is necessary to develop a motor shaft extension sealing structure with a simple structure and low mechanical loss to improve the working efficiency of the motor.

[0038] like Figure 1 As shown, a motor shaft extension sealing structure includes a motor end cover 1, a motor shaft 2, a ball bearing 3 and a sealing ring 4;

[0039] The motor shaft 2 is installed in the motor end cover 1 through a ball bearing 3; the sealing ring 4 is fixedly sleeved on the motor shaft 2 through an interference fit, and a gap channel 7 is formed between the sealing ring 4 and the motor end cover 1 for grease to pass through; the sealing ring 4 can be driven by the motor shaft 2 to rotate synchronously, and there is relative rotation between the sealing ring 4 and the end cover; an oil inlet channel 5 and an oil outlet channel 6 are provided in the motor end cover 1, the oil inlet channel 5 is connected with the inlet end of the gap channel 7 through the ball bearing 3, and the oil outlet channel 6 is connected with the outlet end of the gap channel 7.

[0040] The sealing ring 4 is installed between the motor end cover 1 and the bearing. One end of the sealing ring 4 is fixed on the motor shaft 2, and one side of the sealing ring 4 is close to the inner ring of the ball bearing 3. The lubricating oil flows into the bearing through the oil inlet channel 5, and then flows into the gap channel 7 between the sealing ring 4 and the motor end cover 1 through the bearing, and finally flows out to the oil outlet channel 6.

[0041] The use of the lubricating grease of the bearing for sealing can not only ensure the lubrication of the bearing, but also fill the tortuous gap channel 7 with the lubricating grease to ensure the sealing between the motor shaft 2 and the motor end cover 1, thereby reducing mechanical loss.

[0042] During installation, the ball bearing 3 and the sealing ring 4 can be heated at the same time, and then the motor shaft 2 is sleeved in the ball bearing 3 and the sealing ring, which makes the installation simple.

[0043] Embodiment 2:

[0044] like Figure 2 As shown, a motor shaft extension sealing structure includes a motor end cover 1, a motor shaft 2, a ball bearing 3 and a sealing ring 4;

[0045] The motor shaft 2 is installed in the motor end cover 1 through a ball bearing 3; the sealing ring 4 is fixedly sleeved on the motor shaft 2 through an interference fit, and a gap channel 7 is formed between the sealing ring 4 and the motor end cover 1 for the passage of lubricating grease; the sealing ring 4 can be driven by the motor shaft 2 to rotate synchronously, and there is relative rotation between the sealing ring 4 and the end cover; an oil inlet channel 5 and an oil outlet channel 6 are provided in the motor end cover 1, the oil inlet channel 5 is connected to the inlet end of the gap channel 7 through the ball bearing 3, and the oil outlet channel 6 is connected to the outlet end of the gap channel 7. The gap channel 7 is arranged in a maze-like tortuous manner, and its gap distance ranges from 0.5 to 1.0 mm.

[0046] The sealing ring 4 is installed between the motor end cover 1 and the bearing. One end of the sealing ring 4 is fixed on the motor shaft 2, and one side of the sealing ring 4 is close to the inner ring of the ball bearing 3. The lubricating oil flows into the bearing through the oil inlet channel 5, and then flows into the tortuous gap channel 7 between the sealing ring 4 and the motor end cover 1 through the bearing, and finally flows out to the oil outlet channel 6.

[0047] Optionally, the motor shaft extension sealing structure further includes a bearing cover 8, which is fixedly arranged on the motor end cover 1 and forms a first channel between the bearing cover 8 and the ball bearing 3 and the motor end cover 1. The first channel is connected to the oil inlet channel 5, and the bearing lubricating grease flows into the tortuous gap channel 7 through the oil inlet channel 5, the first channel and the bearing in turn. Sealing with the lubricating grease of the bearing can not only ensure the lubrication of the bearing, but also ensure the sealing between the motor shaft 2 and the motor end cover 1 by filling the tortuous gap channel 7 with the lubricating grease, thereby reducing mechanical loss.

[0048] During installation, the ball bearing 3 and the sealing ring 4 can be heated at the same time, and then the motor shaft 2 is sleeved in the ball bearing 3 and the sealing ring, which makes the installation simple.

[0049] As a preferred technical solution, the surface of the bearing cover 8 in contact with the motor shaft 2 is provided with a plurality of annular first oil storage channels 9. The surface of the motor end cover 1 in contact with the motor shaft 2 is provided with a plurality of annular second oil storage channels 10. The bearing cover 8 is fixed to the motor end cover 1 by bolts 11. The first oil storage channel 9 is provided in the bearing cover 8 and the second oil storage channel 10 is provided in the motor end cover 1, which can improve the reliability of motor protection.

[0050] Embodiment three:

[0051] like Figure 1 As shown, a motor shaft extension sealing structure includes a motor end cover 1, a motor shaft 2, a ball bearing 3 and a sealing ring 4;

[0052] The motor shaft 2 is installed in the motor end cover 1 through a ball bearing 3; the sealing ring 4 is fixedly sleeved on the motor shaft 2 through an interference fit, and a gap channel 7 is formed between the sealing ring 4 and the motor end cover 1 for grease to pass through; the sealing ring 4 can be driven by the motor shaft 2 to rotate synchronously, and there is relative rotation between the sealing ring 4 and the end cover; an oil inlet channel 5 and an oil outlet channel 6 are provided in the motor end cover 1, the oil inlet channel 5 is connected with the inlet end of the gap channel 7 through the ball bearing 3, and the oil outlet channel 6 is connected with the outlet end of the gap channel 7.

[0053] The sealing ring 4 is installed between the motor end cover 1 and the bearing. One end of the sealing ring 4 is fixed on the motor shaft 2, and one side of the sealing ring 4 is close to the inner ring of the ball bearing 3. The lubricating oil flows into the bearing through the oil inlet channel 5, and then flows into the tortuous gap channel 7 between the sealing ring 4 and the motor end cover 1 through the bearing, and finally flows out to the oil outlet channel 6.

[0054] As a preferred technical solution, Figure 3 As shown, the outer surface of the sealing ring 4 located at the gap channel 7 is sealed with a layer of memory metal foil 12 , and a sealed chamber 13 is formed between the memory metal foil 12 and the outer surface of the sealing ring 4 .

[0055] The memory metal sheet 12 is configured to have the characteristic of deforming and bending toward the cavity 13 as the temperature rises. At low temperatures, the surface of the memory metal sheet 12 is parallel to the outer surface of the sealing ring 4.

[0056] When the temperature rises, the middle position of the memory metal sheet 12 is deformed and bent toward the cavity 13, thereby increasing the gap distance of the gap channel 7. Figure 4 The width of the chamber 13 and the deformation characteristic parameters of the memory metal sheet 12 together determine the maximum value of the gap distance of the gap channel 7. Those skilled in the art can adjust and set it according to actual needs, which will not be described in detail here.

[0057] A layer of memory metal sheet 12 is sealed and wrapped on the outer surface of the sealing ring 4 located at the gap channel 7. When the motor shaft heats up, the middle position of the memory metal sheet 12 is deformed and bent toward the cavity 13, thereby increasing the gap distance of the gap channel 7. In this way, the amount of lubricating grease flowing into the motor shaft through the gap channel can be increased, so as to better utilize the lubricating grease to take away excess heat and reduce the temperature of the motor shaft.

[0058] Optionally, the motor shaft extension sealing structure further includes a bearing cover 8, which is fixedly arranged on the motor end cover 1 and forms a first channel between the bearing cover 8 and the ball bearing 3 and the motor end cover 1. Sealing with the lubricating grease of the bearing can not only ensure the lubrication of the bearing, but also fill the tortuous gap channel 7 with the lubricating grease to ensure the sealing between the motor shaft 2 and the motor end cover 1, thereby reducing mechanical loss.

[0059] During installation, the ball bearing 3 and the sealing ring 4 can be heated at the same time, and then the motor shaft 2 is sleeved in the ball bearing 3 and the sealing ring, which makes the installation simple.

[0060] As a preferred technical solution, the surface of the bearing cover 8 in contact with the motor shaft 2 is provided with a plurality of annular first oil storage channels 9. The surface of the motor end cover 1 in contact with the motor shaft 2 is provided with a plurality of annular second oil storage channels 10. The bearing cover 8 is fixed to the motor end cover 1 by bolts 11. The first oil storage channel 9 is provided in the bearing cover 8 and the second oil storage channel 10 is provided in the motor end cover 1, which can improve the reliability of motor protection.

[0061] As a preferred technical solution, a first memory metal sheet is sealed and wrapped on one side surface of the motor end cover located at the gap channel 7, and a sealed first chamber is formed between the first memory metal sheet and the one side surface of the motor end cover located at the gap channel 7. The first memory metal sheet is configured to have the characteristic of deforming and bending toward the first chamber as the temperature rises. By sealing and wrapping a first memory metal sheet on one side surface of the motor end cover located at the gap channel 7, a first sealed chamber is formed between the first memory metal sheet and the one side surface of the motor end cover located at the gap channel 7, when the motor shaft heats up, the gap distance of the gap channel can be increased, and the lubricating grease flowing into the motor shaft can be increased, thereby better taking away excess heat and cooling the motor shaft.

[0062] Correspondingly, the present invention also provides a motor, which includes the motor shaft extension sealing structure described in any one of Embodiments 1, 2 and 3.

[0063] In summary, the motor shaft extension sealing structure and the motor disclosed in the present invention have the following beneficial technical effects:

[0064] 1. Using the lubricating grease of the bearing for sealing can not only ensure the lubrication of the bearing, but also fill the tortuous gap channel with lubricating grease to ensure the sealing between the motor shaft and the motor end cover, thus reducing mechanical loss;

[0065] 2. During installation, the ball bearing and the sealing ring can be heated at the same time, and then the motor shaft sleeve is placed between the ball bearing and the sealing ring. The installation is simple.

[0066] Although the present invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the present invention. That is to say, the methods, systems and devices discussed above are examples, and various configurations may appropriately omit, replace or add various processes or components. For example, in alternative configurations, the method may be performed in an order different from the described order and / or various components may be added, omitted and / or combined. Moreover, the features described with respect to certain configurations may be combined in various other configurations, such as different aspects and elements of the configurations may be combined in a similar manner. In addition, as the technology develops, the elements therein may be updated, i.e., many elements are examples, and do not limit the scope of the present invention disclosed or claimed.

[0067] Specific details are given in the specification to provide a thorough understanding of the exemplary configurations including implementations. However, the configurations may be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary details to avoid obscuring the configurations. This description provides only example configurations and does not limit the scope, applicability, or configurations of the claims. On the contrary, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made to the functions and arrangements of the elements without departing from the spirit or scope of the present disclosure.

[0068] In summary, it is intended that the above detailed description is considered to be illustrative rather than restrictive, and it should be understood that the following claims (including all equivalents) are intended to limit the spirit and scope of the present invention. The above embodiments should be understood to be only used to illustrate the present invention and not to limit the scope of protection of the present invention. After reading the content of the record of the present invention, the technician can make various changes or modifications to the present invention, and these equivalent changes and modifications also fall into the scope defined by the claims of the present invention.

Claims

1. A motor shaft extension sealing structure, characterized in that: Including motor end cover, motor shaft, ball bearing and sealing ring; The motor shaft is installed in the motor end cover through a ball bearing; The sealing ring is fixedly sleeved on the motor shaft, and a gap channel is formed between the sealing ring and the motor end cover for the lubricating grease to pass through. The gap channel is arranged in a maze-like tortuous manner, and the gap distance ranges from 0.5 to 1.0 mm. The outer surface of the sealing ring located at the gap channel is sealed with a layer of memory metal sheet, and a sealed chamber is formed between the memory metal sheet and the outer surface of the sealing ring; When the motor shaft heats up, the middle position of the memory metal sheet is deformed and bent toward the cavity, thereby increasing the gap distance of the gap channel; The sealing ring can be driven by the motor shaft to rotate synchronously, and can rotate relative to the end cover; An oil inlet channel and an oil outlet channel are provided in the motor end cover. The oil inlet channel is connected to the inlet end of the gap channel through a ball bearing, and the oil outlet channel is connected to the outlet end of the gap channel.

2. A motor shaft extension sealing structure as claimed in claim 1, characterized in that: It also includes a bearing cover, which is fixed on the motor end cover and forms a first channel between the bearing cover and the ball bearing and the motor end cover.

3. A motor shaft extension sealing structure as claimed in claim 2, characterized in that: A plurality of annular first oil storage channels are arranged on the surface of the bearing cover which contacts the motor shaft.

4. A motor shaft extension sealing structure as claimed in claim 3, characterized in that: A plurality of annular second oil storage channels are arranged on the surface of the motor end cover at one side in contact with the motor shaft.

5. A motor shaft extension sealing structure as claimed in claim 4, characterized in that: The bearing cover is fixed on the motor end cover by bolts.

6. A motor, characterized in that: The invention comprises a motor shaft extension sealing structure as claimed in any one of claims 1 to 5.

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