New energy motor shaft extension end air-tight structure

Abstract

The application provides a new energy motor shaft extension end air-tight structure, and belongs to the technical field of new energy motors. The new energy motor shaft extension end air-tight structure comprises a motor shell and an end cover installed outside the shell. A rotating shaft is rotatably connected to a shaft hole in the middle of the end cover through a bearing. A rotor outside the rotating shaft is located at the inner center of a stator arranged inside the motor shell. A sealing assembly for sealing the connection between the rotating shaft and the end cover is installed outside the end cover. The sealing assembly comprises a sealing seat fixedly installed outside the end cover through bolts and a sealing ring installed inside the sealing seat. The rotating shaft is a stepped shaft. An annular baffle is installed on the step outside the rotating shaft. An arc-shaped strip is arranged in a circumferential array on the side of the annular baffle close to the sealing seat. An arc-shaped groove is arranged in a circumferential array on the surface of the annular baffle on the side close to the rotating shaft. The application can actively cool and depressurize the sealing ring, thereby reducing the risk of sealing failure caused by high temperature.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy motor, in particular to a new energy motor shaft extension end air-tight structure. BACKGROUND

[0002] As the power core of core equipment such as new energy vehicles and energy storage systems, new energy motors have more severe and complex operating environments and working conditions than traditional motors. New energy motors not only need to withstand higher operating speeds, greater torque output and more severe vibration and impact, but also are often exposed to special scenes such as outdoors and under the chassis, facing the risk of rain and snow erosion, road dust accumulation, electrolyte leakage, etc. As a key protection component of the new energy motor shaft end, the performance of the shaft sealing structure directly determines the reliability, safety and service life of the motor. On the one hand, it needs to prevent external moisture, dust, electrolyte residues and other impurities from entering the motor interior, avoiding serious faults such as stator winding insulation failure, rotor bearing corrosion and permanent magnet demagnetization; on the other hand, it needs to prevent internal lubricating grease leakage to ensure the lubrication stability of high-speed rotating parts, and needs to adapt to the dynamic working conditions of frequent start-stop and sudden speed change of new energy motors to avoid sealing failure.

[0003] In the existing motor shaft sealing technology, the skeleton oil seal is the most commonly used sealing scheme. The skeleton oil seal adopts a structure design of metal skeleton and rubber sealing lip, has the advantages of compact structure, low manufacturing cost and simple installation process, realizes static and dynamic sealing through the close fit of the rubber lip and the surface of the rotating shaft, and can meet the basic sealing needs of medium protection grade motors in dry and clean conventional environments. However, for the severe working conditions of new energy motors, the skeleton oil seal has obvious defects. The sealing lip directly contacts the rotating shaft, and the high speed and severe vibration of the new energy motor can cause the lip to wear out, resulting in an increase in the sealing gap in the short term, which cannot resist the intrusion of impurities in a humid and dusty environment, and the particles generated by wear can further aggravate bearing damage. Moreover, in summer, the sealing element is prone to softening and deformation, and under the influence of high pressure inside the motor, the contact pressure between the sealing element lip and the motor shaft increases, which on the one hand increases the energy consumption of the motor operation, which is contrary to the energy saving needs of new energy motors, and the heat generated by friction can further accelerate the aging of the lip, forming a vicious cycle.

[0004] In order to solve the technical problems existing in the traditional skeleton oil seal, the Chinese invention patent application with publication number CN120728943A discloses a shaft sealing structure and a motor. The technical scheme innovatively adopts the cooperative design of grooves and oil storage chambers. Grooves are arranged on the outer peripheral wall of the shaft extension section of the shaft, a first sealing ring is arranged at the shaft hole of the end cover, part of the wall body of the first sealing ring is embedded in the groove to form a first oil storage chamber, a second sealing ring can be additionally arranged outside the first sealing ring to form a second oil storage chamber, and the two oil storage chambers are in communication and filled with lubricating grease. The lubricating grease stored in the oil storage chamber forms a dynamic sealing barrier, effectively blocking the entry of external water vapor, dust and other impurities into the motor through the gap between the shaft hole and the shaft extension section; the non-contact sealing between the sealing ring and the shaft extension section is realized through the lubricating grease film, which greatly reduces the friction coefficient and reduces the wear of the parts; to a certain extent, it ensures that the motor maintains stable sealing performance under different operating speeds, load conditions and environmental temperatures.

[0005] Although the technical scheme of the above-mentioned patent has made significant progress compared with the traditional skeleton oil seal, the sealing performance has been improved through double sealing rings and oil storage chambers, but there is still optimization potential. First of all, due to the influence of the oil storage chamber, the installation precision of the sealing ring is relatively high, and the installation difficulty is relatively large. When dynamic sealing is performed through lubricating grease, the impurities in the environment will still enter the lubricating grease, and the viscosity stability of the lubricating grease will decrease with the circulation of the lubricating grease, which will easily cause damage to the sealing grease film and affect the sealing effect. SUMMARY

[0006] Therefore, the present application provides a new energy motor shaft extension end air-tight structure to solve the problem of sealing failure of the motor shaft sealing structure due to the influence of dust in the external environment.

[0007] In order to solve the above-mentioned technical problems, the present application provides a new energy motor shaft extension end air-tight structure, which comprises a motor shell and an end cover installed outside the shell. A shaft hole in the middle of the end cover is rotatably connected with a shaft through a bearing. A rotor outside the shaft is located at the inner center of a stator arranged inside the motor shell. A sealing assembly for sealing the connection between the shaft and the end cover is installed outside the end cover. The sealing assembly comprises a sealing seat fixedly installed outside the end cover through bolts and a sealing ring installed inside the sealing seat. The shaft is a stepped shaft, and an annular baffle is installed on the stepped portion outside the shaft. An arc-shaped strip is arranged in a circumferential array on the side of the annular baffle close to the sealing seat. An arc-shaped groove is arranged in a circumferential array on the surface of the annular baffle close to the shaft. A dustproof ring is arranged on the side of the annular baffle away from the shaft. A conical groove is arranged on the outer side surface of the sealing seat to cooperate with the dustproof ring.

[0008] By adopting the technical scheme, when the annular baffle rotates synchronously with the rotating shaft, the arc-shaped strips in the circumferential array of the side surface of the annular baffle are equivalent to impeller blades, and when rotating at a high speed, negative pressure is formed in the arc-shaped groove area, thereby driving external air to enter the gap between the annular baffle and the sealing seat along the arc-shaped groove and to be discharged from the gap between the dustproof ring and the conical groove. Not only is a first physical dustproof barrier formed to block impurities in the air from directly invading the sealing core area, but also the inclined structure can guide part of the airflow to be discharged along the conical surface, thereby further enhancing the dustproof effect. Meanwhile, the conical surface cooperation structure can improve the cooperation sealing performance between the annular baffle and the sealing seat, thereby avoiding air leakage to cause the dustproof and heat dissipation efficiency to be reduced. The preliminary dustproof sealing is realized, and a stable structural foundation is provided for subsequent airflow circulation dustproof and heat dissipation, thereby significantly improving the assembly stability and functional reliability of the overall structure.

[0009] Optionally, the lip on the inner side surface of the sealing ring is conically arranged, and the lip can abut against the outer side surface of the rotating shaft to seal the protruding end of the rotating shaft.

[0010] By adopting the technical scheme, the conical lip forms linear contact sealing with the outer side surface of the rotating shaft, and the fit of the lip and the rotating shaft can be further enhanced during rotation of the rotating shaft, thereby effectively blocking the leakage of lubricating oil in the motor and the invasion of external impurities, and improving the air-tight and oil-tight effect of the shaft protruding end.

[0011] Optionally, the sealing ring is internally provided with a metal framework, the metal framework is arranged in a ring shape, and the inner side surface of the metal framework is uniformly provided with openings, and the metal framework is used to support the sealing ring.

[0012] By adopting the technical scheme, the annular metal framework provides stable structural support for the sealing ring, reduces the probability of excessive deformation of the sealing ring due to pressure or temperature change, and enables the sealing ring to maintain its shape during installation, thereby reducing the friction during installation. The uniformly arranged openings in the inner side surface of the metal framework give the metal framework a certain elastic deformation capacity, so that the metal framework can be adjusted by extrusion during installation, and the normal pre-tightening deformation of the lip of the sealing ring is not affected.

[0013] Optionally, a limiting ring is slidably connected in the annular groove arranged on the outer side surface of the end cover, springs are installed in the circular holes uniformly distributed on the end surface of the limiting ring, the outer end of each spring abuts against the inner wall of the annular groove, the end surface of the limiting ring can abut against the inner conical surface of the sealing ring, and the limiting ring and the sealing seat can extrude the metal framework in the sealing ring to apply a pre-tightening force to the sealing ring.

[0014] By adopting the technical scheme, the spring provides continuous and stable outward elastic force for the limiting ring, so as to make the limiting ring tightly abut against the inner tapered surface of the sealing ring, and realize precise extrusion of the metal framework together with the sealing seat, thereby providing uniform pre-tightening force for the sealing ring, and ensuring that the sealing ring lip is stably attached to the rotating shaft; meanwhile, the sliding connection design of the limiting ring and the annular groove reserves a moving space for subsequent pressure relief adjustment under high temperature and high pressure, and realizes the function compatibility of pre-tightening sealing and self-adaptive pressure relief.

[0015] Optionally, an inner wall of the limiting ring near the sealing ring is provided with a stepped groove, a diameter of the stepped groove gradually increases from inside to outside, an inner wall of the sealing ring is provided with an extrusion ring corresponding to a position of the lip, and an inner arc of the stepped groove can abut against the extrusion ring and apply pre-tightening force to the position of the lip of the sealing ring.

[0016] By adopting the technical scheme, the inner arc of the stepped groove with gradually changing diameter abuts against the extrusion ring, the axial extrusion force of the limiting ring can be accurately transmitted to the position of the lip of the sealing ring, directional application of the pre-tightening force is realized, the attachment precision of the lip and the rotating shaft is improved, and the reliability of the lip sealing is ensured, and meanwhile, the stepped groove enables the limiting ring to axially displace when subjected to a larger pressure.

[0017] Optionally, a plurality of guide strips are arranged in the circumferential direction of the outer side of the limiting ring, a plurality of sliding grooves are arranged in the circumferential direction of the inner wall of the annular groove and are matched with the guide strips, the guide strips can slide in the sliding grooves in the axial direction of the limiting ring, and the guide strips are used for limiting self-rotation of the limiting ring.

[0018] By adopting the technical scheme, the guide strips and the sliding grooves form a circumferential limiting structure, the self-rotation of the limiting ring in the annular groove is effectively limited, the stepped groove on the limiting ring and the extrusion ring of the sealing ring always maintain a precise alignment relationship, uneven distribution of the pre-tightening force caused by self-rotation of the limiting ring is avoided, and the stability of the lip sealing of the sealing ring is ensured.

[0019] Optionally, a plurality of guide columns are arranged in the circumferential direction of one side of the sealing seat near the end cover, and a plurality of guide holes are arranged in the circumferential direction of the outer side of the end cover and are matched with the guide columns.

[0020] By adopting the technical scheme, the precise matching of the guide columns and the guide holes provides a coaxial positioning reference for installation of the sealing seat, ensures that the sealing seat, the rotating shaft and the end cover maintain coaxiality, avoids uneven force on the sealing ring caused by installation deflection of the sealing seat, and improves the precision and stability of installation of the sealing seat.

[0021] Optionally, a plurality of heat-conducting fins are uniformly distributed at the outer edge of the metal framework, the heat-conducting fins all extend to the outer side of the sealing ring, a plurality of heat dissipation holes corresponding to positions of the sealing ring are uniformly arranged on the outer side of the sealing seat, and the heat-conducting fins correspond to positions of the heat dissipation holes on the outer side of the sealing seat.

[0022] By adopting the technical scheme, the heat-conducting fins on the metal framework can quickly conduct the heat generated in the working process of the sealing ring, the design of extending to the outside of the sealing ring increases the heat dissipation contact area, the heat dissipation holes on the sealing seat form a heat dissipation channel, the external airflow and the heat-conducting fins are facilitated to exchange heat, the sealing ring is actively cooled, and the risk of aging and failure of the sealing ring in a high-temperature environment is effectively reduced.

[0023] Optionally, the annular baffle is uniformly distributed with guide plates on the side close to the sealing seat, and the guide plates are arranged in one-to-one correspondence with the arc-shaped grooves.

[0024] By adopting the technical scheme, the one-to-one correspondence design of the guide plates and the arc-shaped grooves can guide the airflow generated by the rotation of the annular baffle, so that the airflow flows between the annular baffle and the sealing seat along a preset path, on the one hand, the airflow enhances the dust blocking effect and improves the dustproof performance, and on the other hand, the airflow flows through the heat dissipation holes and the heat-conducting fins, and the heat dissipation efficiency is strengthened.

[0025] Optionally, the inner edge surface of the sealing ring is provided with a dustproof lip, the dustproof lip is located on the left side of the lip opening, the dustproof lip is arranged in an inclined manner, and the inner edge of the dustproof lip can abut against the outside of the rotating shaft.

[0026] By adopting the technical scheme, the dustproof lip arranged in an inclined manner forms a secondary dustproof barrier in front of the main sealing lip opening, which can block the invasion of external dust and impurities before the lip opening, avoid dust abrasion of the lip opening or contamination of the lubricating oil, and further improve the long-term stability and service life of the sealing structure.

[0027] In summary, compared with the prior art, the present application has at least one of the following beneficial technical effects:

[0028] 1. The annular baffle is rotated to generate airflow circulation, forming a first dustproof barrier to block dust from invading the lip opening of the sealing ring, avoiding dust abrasion of the lip opening or contamination of the lubricating oil, ensuring long-term stable operation of the sealing structure, and at the same time, the flowing airflow cooperates with the heat dissipation holes and the heat-conducting fins to actively cool the metal framework of the sealing ring, reduce the risk of sealing failure caused by high temperature, realize integrated design of dustproof and heat dissipation, and have stronger applicability.

[0029] 2. By means of the installation gap formed by the initial non-pre-tightening of the sealing ring, and the coaxial positioning structure of the guide column and the guide hole, the installation operation of the sealing seat is simplified, and to some extent, the deflection and stress imbalance of the lip opening of the sealing ring caused by uneven friction during installation are avoided, the cooperation precision of the sealing ring and the rotating shaft is significantly improved, and the installation damage probability of the lip opening is reduced.

[0030] 3. Under high temperature and high pressure conditions, the pressure inside the sealed cavity automatically strengthens the fit between the lip and the rotating shaft, improving sealing reliability. Moreover, when the pressure exceeds the threshold, the limit ring overcomes the spring force to move and release pressure, avoiding overload of friction between the lip and the rotating shaft. This effectively solves the industry pain point of easy failure of the sealing ring lip under high temperature and high pressure, and significantly extends the service life of the sealing ring. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of a new energy motor shaft extension end airtight structure according to this application;

[0032] Figure 2 This is a partial cross-sectional structural diagram of this application;

[0033] Figure 3 For this application Figure 2 A magnified schematic diagram of the structure at point A in the diagram;

[0034] Figure 4 This is a schematic diagram of the structure of the annular baffle in this application;

[0035] Figure 5 This is a schematic diagram of the right side structure of the annular baffle in this application;

[0036] Figure 6 This is a partial cross-sectional view of the annular baffle of this application;

[0037] Figure 7 This is a partial cross-sectional view of the sealing ring of this application;

[0038] Figure 8 This is a schematic diagram of the left side structure of the sealing ring and metal skeleton of this application.

[0039] Explanation of reference numerals in the attached drawings: 1. Motor housing; 101. End cover; 102. Guide hole; 2. Rotating shaft; 3. Sealing assembly; 31. Sealing seat; 311. Conical groove; 312. Guide post; 313. Heat dissipation hole; 32. Sealing ring; 321. Lip; 322. Extrusion ring; 323. Dustproof lip; 4. Annular baffle; 41. Arc strip; 42. Arc groove; 43. Dustproof ring; 44. Guide plate; 5. Metal frame; 51. Notch; 52. Heat-conducting fins; 6. Annular groove; 61. Slide groove; 7. Limiting ring; 71. Spring; 72. Step groove; 73. Guide strip. Detailed Implementation

[0040] The following will be described in conjunction with embodiments of this application. Figures 1-8The technical solutions of the embodiments of the present application are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0041] With reference to Figure 1 , Figure 2 and Figure 3 , the embodiment provides a new energy motor shaft extension end air-tight structure, which comprises a motor shell 1, a sealing assembly 3 and a dustproof assembly. A cover 101 is fixedly installed at a port of the motor shell 1 through bolts, a rotating shaft 2 is rotatably connected in a shaft hole in the middle of the cover 101 through bearings, and a rotor on the outer side of the rotating shaft 2 is located at the inner center of a stator arranged inside the motor shell 1.

[0042] The sealing assembly 3 is arranged on the outer side of the cover 101 and is used for sealing the connection between the rotating shaft 2 and the shaft hole, which is used for avoiding the entry of external impurities into the motor and the leakage of lubricating oil at the bearing; the dustproof assembly is located on the outer side of the sealing assembly 3 and can greatly reduce the probability of the entry of external dust into the sealing assembly 3 and cause the sealing failure.

[0043] With reference to Figure 2 and Figure 3 , the sealing assembly 3 comprises a sealing seat 31 and a sealing ring 32. The sealing seat 31 is fixedly installed on the outer side of the cover 101 through bolts, and the sealing ring 32 is clamped in the inner part of the sealing seat 31. The lip 321 on the inner side of the sealing ring 32 is conically arranged, and the lip 321 can abut against the outer side of the rotating shaft 2 to seal the extension end of the rotating shaft 2. A metal framework 5 for supporting the sealing ring 32 is arranged in the inner part of the sealing ring 32. The metal framework 5 is annularly arranged, and the inner side of the metal framework 5 is uniformly provided with apertures 51 (with reference to Figure 7 and Figure 8 ). The sealing seat 31 is arrayed with guide columns 312 in the circumferential direction of the side close to the cover 101, and the outer side of the cover 101 is arrayed with guide holes 102 matched with the guide columns 312 in the circumferential direction.

[0044] In use, the sealing ring 32 is first installed in the inner part of the sealing seat 31, at this time, the metal skeleton 5 in the inner part of the sealing ring 32 is in a contracted state, the sealing ring 32 is not subjected to a pre-tightening force, and therefore there is a certain gap between the inner side lip 321 of the sealing ring 32 and the outer side of the rotating shaft 2, facilitating the installation of the sealing seat 31, when the sealing seat 31 is installed to a certain extent, the guide column 312 on the end face of the sealing seat 31 cooperates with the guide hole 102 arranged on the outer side of the end cover 101, which can ensure the coaxial installation of the sealing seat 31 and the rotating shaft 2, thereby improving the fitting precision between the sealing ring 32 and the rotating shaft 2 during the installation of the sealing ring 32, and reducing the probability of uneven force on the lip 321 due to the deflection caused by friction during the installation of the sealing ring 32.

[0045] With reference to Figure 2 and Figure 3 , the annular groove 6 arranged on the outer side of the end cover 101 is slidably connected with the limiting ring 7, the outer side of the limiting ring 7 is circumferentially arrayed with guide strips 73, the inner wall of the annular groove 6 is circumferentially arrayed with sliding grooves 61 matched with the guide strips 73, the circular holes uniformly distributed on the end face of the limiting ring 7 are each installed with a spring 71, the outer end of the spring 71 is in abutment with the inner wall of the annular groove 6, for applying an outward elastic force to the limiting ring 7, the end face of the limiting ring 7 can be in abutment with the inner tapered surface of the sealing ring 32, the limiting ring 7 cooperates with the sealing seat 31 to extrude the metal skeleton 5 in the inner part of the sealing ring 32, thereby applying a pre-tightening force to the sealing ring 32; the inner wall of the side of the limiting ring 7 close to the sealing ring 32 is provided with a stepped groove 72, the diameter of the stepped groove 72 gradually increases from the inside to the outside, the inner wall of the sealing ring 32 is provided with an extrusion ring 322 corresponding to the position of the lip 321, the inner arc of the stepped groove 72 can be in abutment with the extrusion ring 322 and apply a pre-tightening force to the position of the lip 321 of the sealing ring 32.

[0046] During the installation of the sealing seat 31, the outer side of the limiting ring 7 is first in abutment with the inner tapered surface of the sealing ring 32, at the same time, the inner arc surface of the stepped groove 72 in the inner part of the limiting ring 7 is in abutment with the extrusion ring 322 on the inner wall of the sealing ring 32 (with reference to Figure 3 ), as the sealing seat 31 gradually fits with the end cover 101, the springs 71 in the inner part of the limiting ring 7 are gradually compressed and apply an extrusion force to the sealing ring 32, so that the metal skeleton 5 in the inner part of the sealing ring 32 is deformed to a certain extent, at the same time, as the diameter of the stepped groove 72 gradually increases from the inside to the outside, as the sealing seat 31 moves, the limiting ring 7 gradually applies pressure to the extrusion ring 322, thereby applying a certain pre-tightening force to the position of the lip 321 of the sealing ring 32 through the deformation of the extrusion ring 322, so as to ensure that the lip 321 of the sealing ring 32 is closely fitted with the outer side of the rotating shaft 2, and to ensure the sealing performance of the connection part of the rotating shaft 2 during rotation.

[0047] When the motor is continuously running for a long time in a high-temperature environment, as the heat of the internal core components of the motor continuously accumulates, the temperature of the lubricating oil at the bearing assembly of the rotating shaft 2 gradually increases. Due to the expansion of the lubricating oil after being heated, the pressure inside the sealing cavity continuously increases. Under the action of the pressure, the elastic lip 321 of the sealing ring 32 will adaptively deform, further improving the close-fitting degree of the elastic lip 321 with the outer surface of the rotating shaft 2, thereby enhancing the sealing reliability of the sealing structure and effectively blocking the intrusion of external impurities.

[0048] However, when the pressure inside the sealing cavity rises to a preset threshold (i.e., exceeds the pre-tightening elastic force of the compression spring 71 in the sealing structure), the limiting ring 7 starts to overcome the elastic force of the spring 71 under the action of the pressure difference and moves a certain stroke along the axial direction of the annular groove 6 into the groove, so that the cavity space at the sealing position of the rotating shaft 2 is effectively expanded, thereby forming a dynamic pressure relief channel and achieving pressure relief at the sealing position. On the one hand, it avoids structural damage of the sealing cavity due to overpressure, and on the other hand, it effectively avoids the problem of rapid increase of friction force caused by excessive extrusion of the lip 321 inside the sealing ring 32 with the surface of the rotating shaft 2 under the action of continuous high pressure, thereby significantly reducing the material fatigue and wear of the lip 321 part, reducing the risk of rapid failure of the lip 321 of the sealing ring 32 under harsh conditions of high temperature and high pressure, greatly prolonging the service life of the sealing ring 32, ensuring the long-term stable operation of the motor in a high-temperature environment, and improving the overall working reliability and durability of the motor.

[0049] Referring to Figure 3 , Figure 4 and Figure 5 , the dustproof assembly includes an annular baffle 4 and an arc-shaped groove 42. The annular baffle 4 is fixedly installed on the stepped surface of the outer side of the rotating shaft 2 and can rotate synchronously with the rotating shaft 2. The outer edge of the annular baffle 4 is provided with a dustproof ring 43, which is inclined. A tapered groove 311 is formed on the outer side of the sealing seat 31, and the dustproof ring 43 is located inside the tapered groove 311. A gap for air flow is left between the end face of the dustproof ring 43 and the inner wall of the tapered groove 311. The surface of the annular baffle 4 on the side close to the rotating shaft 2 is circumferentially arrayed with the arc-shaped grooves 42. The surface of the annular baffle 4 on the side close to the sealing seat 31 is circumferentially arrayed with arc-shaped strips 41. The surface of the annular baffle 4 on the side close to the sealing seat 31 is uniformly distributed with flow guides 44, which are correspondingly arranged with the arc-shaped grooves 42 (refer to Figure 5 and Figure 6 ) for guiding the airflow.

[0050] During the operation of the motor, the annular baffle 4 rotates at a high speed synchronously with the rotating shaft 2. The side surface of the annular baffle 4 is designed in an arrayed arc-shaped strip 41 structure. The arc-shaped strips 41 are arranged at a specific inclination angle. When the arc-shaped strips 41 rotate at a high speed with the annular baffle 4, a directional airflow driving force is generated. External air is sucked into the gap between the annular baffle 4 and the sealing seat 31 through the arc-shaped grooves 42. The sucked air flows to the edge of the annular baffle 4 under the guidance of the flow guide plate 44 arranged on the inner side of the sealing seat 31, and is finally discharged outward from the gap between the dustproof ring 43 and the inner wall of the conical groove 311, forming a continuous airflow barrier. The continuous airflow barrier can effectively prevent dust particles in the air from entering the inner core sealing area of the sealing ring 32, significantly reduce the problems of sealing surface wear and sealing performance degradation caused by dust deposition, and greatly improve the dustproof reliability of the sealing structure.

[0051] With reference to Figure 7 and Figure 8 , the outer edge of the metal framework 5 is uniformly distributed with heat-conducting fins 52. The heat-conducting fins 52 extend to the outer side of the sealing ring 32. The outer side of the sealing seat 31 is uniformly provided with heat dissipation holes 313 corresponding to the position of the sealing ring 32. The heat-conducting fins 52 correspond to the position of the heat dissipation holes 313 on the outer side of the sealing seat 31.

[0052] When the air flows at a high speed in the gap between the annular baffle 4 and the sealing seat 31, the air fully contacts the heat-conducting fins 52 integrally formed with the outer edge of the metal framework 5 through the uniformly distributed heat dissipation holes 313 arranged on the sealing seat 31. The heat-conducting fins 52 are arranged in a multi-piece array. The heat-conducting fins 52 have a large heat dissipation surface area and can quickly conduct the heat generated by the metal framework 5 during the sealing operation to the airflow. Through the forced convection heat exchange between the airflow and the heat-conducting fins 52, the metal framework 5 is efficiently cooled, the working environment temperature of the sealing ring 32 is effectively controlled, the problems of material aging, elastic attenuation, and sealing surface deformation of the sealing ring 32 caused by long-term high-temperature operation are avoided, the risk of sealing failure caused by high temperature is further reduced, the service life of the sealing ring 32 is prolonged, and the long-term stable operation of the motor is ensured.

[0053] With reference to Figure 3 and Figure 7 , the inner edge of the sealing ring 32 is provided with a dustproof lip 323. The dustproof lip 323 is located on the left side of the lip 321. The dustproof lip 323 is arranged at an inclination. The inner edge of the dustproof lip 323 can abut against the outer side of the rotating shaft 2, so as to reduce the probability of external dust entering the position of the lip 321 of the sealing ring 32.

[0054] The implementation principle of the new energy motor shaft extension end air-tight structure according to the embodiment of the application is as follows.

[0055] Firstly, the sealing ring 32 is installed in the sealing seat 31, at this time, the metal skeleton 5 in the sealing ring 32 is in a contracted state, the sealing ring 32 as a whole is not subjected to a pre-tightening force, and a preset gap is formed between the inner side lip 321 of the sealing ring 32 and the outer side surface of the rotating shaft 2, which provides a convenient condition for the subsequent installation of the sealing seat 31; when the sealing seat 31 is installed to a preset position, the guide column 312 arranged on the end face of the sealing seat 31 is matched with the guide hole 102 corresponding arranged on the outer side of the end cover 101, so as to ensure that the sealing seat 31 is coaxially installed with the rotating shaft 2, effectively improve the matching precision of the sealing ring 32 and the rotating shaft 2, and significantly reduce the risk of uneven force on the lip 321 due to the uneven friction during the installation of the sealing ring 32.

[0056] With the continuous advancement of the sealing seat 31 to completely adhere to the end cover 101, the outer end face of the limiting ring 7 first abuts against the inner tapered surface of the sealing ring 32, and the inner arc surface of the stepped groove 72 in the limiting ring 7 abuts against the extrusion ring 322 on the inner wall of the sealing ring 32. During the continuous advancement of the sealing seat 31, the spring 71 in the limiting ring 7 is gradually compressed, and the compressed spring 71 continuously extrudes the sealing ring 32, so as to cause the adaptive deformation of the metal skeleton 5 in the sealing ring 32. Since the diameter of the stepped groove 72 in the limiting ring 7 gradually increases from the inside to the outside, under the movement of the sealing seat 31, the pressure of the limiting ring 7 on the extrusion ring 322 gradually increases, and after the deformation of the extrusion ring 322, the force is transmitted to the position of the lip 321 of the sealing ring 32, so that the lip 321 obtains stable pre-tightening force, and finally realizes the close adhesion between the lip 321 in the sealing ring 32 and the outer side surface of the rotating shaft 2, thereby providing basic sealing protection for the connection during the rotation of the rotating shaft 2.

[0057] When the motor continuously works in a high-temperature environment, with the increase of the temperature in the motor, the temperature of the lubricating oil at the bearing of the rotating shaft 2 also rises, and the pressure in the sealing cavity increases accordingly. Under the action of the pressure, the adhesion between the lip 321 in the sealing ring 32 and the outer side surface of the rotating shaft 2 is further improved, and the sealing performance is strengthened. When the pressure in the sealing cavity exceeds the elastic threshold of the spring 71, the pressure will drive the limiting ring 7 to move to the inside of the annular groove 6 by overcoming the elastic force of the spring 71. This movement process increases the accommodation space of the sealing position of the rotating shaft 2, thereby realizing the pressure relief effect. Not only can the problem of continuously increasing friction between the lip 321 in the sealing ring 32 and the rotating shaft 2 in a high-pressure environment be avoided, but also the probability of rapid failure of the lip 321 in the sealing ring 32 due to the double effects of high temperature and high pressure can be effectively reduced, thereby significantly prolonging the service life of the sealing ring 32.

[0058] In the working process of the motor, the annular baffle 4 fixedly connected with the rotating shaft 2 rotates at high speed with the rotating shaft 2, and the arc-shaped strips 41 arranged on the side surface of the annular baffle 4 generate negative pressure when rotating, so that external air is sucked into the gap between the annular baffle 4 and the sealing seat 31 from the arc-shaped grooves 42, and the sucked air is guided outward from the gap between the dustproof ring 43 and the inner wall of the conical groove 311 under the guidance of the guide plate 44 arranged in the sealing seat 31, so that a continuous air circulation is formed. The circulating air can block dust in the external air from entering the inside of the sealing ring 32, and greatly reduces the interference of dust on the sealing performance. In addition, the inner edge surface of the sealing ring 32 is also provided with a dustproof lip 323 located on the left side of the main sealing lip 321, which is designed in an inclined structure, and the inner side edge thereof can be tightly abutted with the outer side surface of the rotating shaft 2 to form a secondary dustproof barrier, thereby further reducing the probability of external dust entering the position of the main lip 321 of the sealing ring 32 and strengthening the overall dustproof effect.

[0059] In the air circulation process, the flowing air fully contacts the heat-conducting fins 52 uniformly distributed on the outer edge of the metal skeleton 5 of the sealing ring 32 through the heat dissipation holes 313 on the sealing seat 31, so that heat exchange is realized by air flow, the metal skeleton 5 arranged in the sealing ring 32 is cooled efficiently, and the risk of sealing failure of the sealing ring 32 due to long-term high-temperature environment is further reduced.

[0060] In addition, in the description of the present application, the terms “mounting”, “connecting”, “connecting”, “setting” should be understood broadly, and the specific meanings of the above terms in the present application can be understood by those skilled in the art according to the specific circumstances.

Claims

1. A new energy motor shaft extension end air-tight structure, comprising a motor shell (1) and an end cover (101) installed outside the shell, a rotating shaft (2) is rotatably connected in the shaft hole of the middle part of the end cover (101) through a bearing, and the rotor outside the rotating shaft (2) is located at the inner center of the stator arranged inside the motor shell (1), characterized in that: a sealing assembly (3) for sealing the connection between the rotating shaft (2) and the end cover (101) is installed outside the end cover (101), the sealing assembly (3) comprises a sealing seat (31) fixedly installed outside the end cover (101) through bolts, and a sealing ring (32) installed inside the sealing seat (31); the rotating shaft (2) is a stepped shaft, an annular baffle (4) is installed on the step outside the rotating shaft (2), arc-shaped strips (41) are arranged in the circumferential direction on the side of the annular baffle (4) close to the sealing seat (31), arc-shaped grooves (42) are arranged in the circumferential direction on the surface of the annular baffle (4) on the side close to the rotating shaft (2), a dustproof ring (43) is arranged on the side of the annular baffle (4) away from the rotating shaft (2), and a tapered groove (311) matched with the dustproof ring (43) is arranged on the outer side surface of the sealing seat (31). The inner surface of the sealing ring (32) is tapered, the lip (321) of the inner surface of the sealing ring (32) can abut against the outer surface of the rotating shaft (2), and the lip (321) is used for sealing the extension end of the rotating shaft (2). A metal framework (5) is arranged inside the sealing ring (32), the metal framework (5) is arranged in a ring shape, and the inner edge of the metal framework (5) is uniformly provided with an opening (51), and the metal framework (5) is used for supporting the sealing ring (32).

2. The new energy motor shaft extension end air-tight structure according to claim 1, characterized in that: A limiting ring (7) is slidably connected in the annular groove (6) arranged outside the end cover (101), springs (71) are arranged in the circular holes uniformly distributed on the end surface of the limiting ring (7), the outer end of each spring (71) abuts against the inner wall of the annular groove (6), the limiting ring (7) is used for applying an outward elastic force to the limiting ring (7), the end surface of the limiting ring (7) can abut against the inner tapered surface of the sealing ring (32), the limiting ring (7) and the sealing seat (31) can extrude the metal framework (5) inside the sealing ring (32), and the limiting ring (7) is used for applying a pre-tightening force to the sealing ring (32).

3. The shaft extension end air-tight structure of a new energy motor according to claim 2, characterized in that: A stepped groove (72) is arranged on the inner wall of the side of the limiting ring (7) close to the sealing ring (32), the diameter of the stepped groove (72) gradually increases from the inside to the outside, the inner wall of the sealing ring (32) is provided with an extrusion ring (322) corresponding to the position of the lip (321), and the inner arc of the stepped groove (72) can abut against the extrusion ring (322) and apply a pre-tightening force to the position of the lip (321) of the sealing ring (32).

4. The shaft extension end air-tight structure of a new energy motor according to claim 2, characterized in that: The outer surface of the limiting ring (7) is circumferentially arranged with guide strips (73), the inner wall of the annular groove (6) is circumferentially arranged with sliding grooves (61) matched with the guide strips (73), the guide strips (73) can slide in the sliding grooves (61) along the axial direction of the limiting ring (7), and the guide strips (73) are used for limiting the rotation of the limiting ring (7).

5. The shaft extension end gas seal structure of a new energy motor according to claim 4, characterized in that: ​ 6. The shaft extension end gas seal structure of a new energy motor according to claim 4, characterized in that: ​ 7. The shaft extension end gas seal structure of a new energy motor according to claim 4, characterized in that: The sealing seat (31) is arranged with guide columns (312) in the circumferential direction on one side close to the end cover (101), and the outer side of the end cover (101) is arranged with guide holes (102) in the circumferential direction, which are matched with the guide columns (312).

8. The shaft extension end gas seal structure of a new energy motor according to claim 3, characterized in that: The metal framework (5) is uniformly arranged with heat-conducting fins (52) on the outer edge, the heat-conducting fins (52) extend to the outer side of the sealing ring (32), the outer side of the sealing seat (31) is uniformly arranged with heat dissipation holes (313) corresponding to the positions of the sealing ring (32), and the heat-conducting fins (52) correspond to the positions of the heat dissipation holes (313) on the outer side of the sealing seat (31).

9. The shaft extension end gas seal structure of a new energy motor according to claim 1, characterized in that: The annular baffle (4) is uniformly arranged with guide plates (44) on one side close to the sealing seat (31), and the guide plates (44) are arranged one by one corresponding to the arc-shaped grooves (42).

10. The shaft extension end gas seal structure of a new energy motor according to claim 1, characterized in that: The inner edge surface of the sealing ring (32) is arranged with a dustproof lip (323), the dustproof lip (323) is located on the left side of the lip (321), the dustproof lip (323) is arranged in an inclined manner, and the inner edge of the dustproof lip (323) can abut against the outer side of the rotating shaft (2).

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