Sealing waterproof structure for shaft end of submersible sewage pump

Abstract

The utility model relates to the technical field of water prevention of water pumps, in particular to a shaft end sealing waterproof structure of a submersible sewage pump, which comprises a motor shell, a shaft end sealing structure and a shaft end sealing structure, the rotor shaft body is rotationally installed on the bearing and extends out of the motor shell, a sealing channel is formed between the rotor shaft body and the motor shell, the sealing channel is sequentially provided with a baffle ring and a plurality of sealing framework rings from outside to inside in the axial direction of the rotor shaft body, and the baffle ring is fixedly installed outside the motor shell and is coaxially arranged with the rotor shaft body; the baffle ring is used for blocking large-size impurities in water and supporting the sealing framework rings, the rotor shaft body is sleeved with the multiple sealing framework rings, the side, close to the rotor shaft body, of the sealing framework ring located at the head end extends in the shaft end direction of the rotor shaft body to be provided with a dustproof lip, and the dustproof lip is used for abutting against the rotor shaft body. And an opening type inner cavity for water circulation is formed between the baffle ring and the dustproof lip. The effects of improving the waterproof performance of the pump body and prolonging the service life of the pump body are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water pump waterproof, especially a kind of waterproof structure of shaft end sealing of submersible sewage pump. BACKGROUND

[0002] As the key equipment in the field of sewage treatment, drainage and the like, submersible sewage pump is widely used in various complex working environments.In the structure of submersible sewage pump, the end of rotor shaft body needs to extend out of the motor to connect the impeller and other components.The extended part directly contacts with the external water body, so the sealing and waterproof performance of the shaft end is crucial.If the sealing effect of the shaft end is poor, the external moisture can easily penetrate into the motor, resulting in problems such as degradation of insulation performance of stator winding, short circuit of winding, corrosion of bearing, etc., which may cause motor failure or even burnout, affect the normal operation of the equipment, increase maintenance cost, and even cause safety accidents.

[0003] In the prior art, a sealing ring is usually added on both sides of the bearing at the shaft end of the pump body to prevent moisture from entering the motor from the bearing.This method has the following problems:In the sewage environment, a large amount of solid impurities can easily enter the sealing end face, aggravate the wear caused by friction, and easily cause the sealing surface to fail, thereby shortening the service life of the sealing.Therefore, how to design a waterproof structure of shaft end sealing of submersible sewage pump that can effectively resist impurities in water and improve waterproof performance and increase the service life of the pump body is a technical problem that needs to be solved by technical personnel of enterprises. SUMMARY

[0004] In view of the above problems in the prior art, the present application provides a waterproof structure of shaft end sealing of submersible sewage pump.

[0005] The above invention purpose of the present application is realized by the following technical scheme:

[0006] A waterproof structure of shaft end sealing of submersible sewage pump, comprising:

[0007] A motor housing having a bearing fixedly installed inside;

[0008] A rotor shaft body rotatably installed on the bearing and extending out of the motor housing, a sealing passage being formed between the rotor shaft body and the motor housing, the sealing passage being provided with a baffle ring and a plurality of sealing skeleton rings in sequence from outside to inside along the axial direction of the rotor shaft body, the baffle ring being fixedly installed outside the motor housing and coaxially arranged with the rotor shaft body, the baffle ring being used to block large-volume impurities in water and support the sealing skeleton rings, the plurality of sealing skeleton rings being sleeved on the rotor shaft body, the sealing skeleton ring located at the first end being provided with a dustproof lip extending towards the axial end of the rotor shaft body on the side close to the rotor shaft body, the dustproof lip being used to abut against the rotor shaft body, and an open-type inner cavity for water circulation being formed between the baffle ring and the dustproof lip.

[0009] By adopting the technical scheme, when the sewage pump is working, the blocking ring serves as a primary barrier to first intercept large-volume impurities in the sewage, thereby avoiding the impurities from directly impacting the sealing skeleton ring. In addition, the dustproof lip of the sealing skeleton ring located at the first end extends to the shaft end and abuts against the surface of the rotor shaft body to form an open cavity between the dustproof lip and the blocking ring. The open cavity allows a small amount of water to enter and pass through the rotor shaft body to rotate to drive the water to circulate. In this way, the residual fine solid impurities are washed away by the water flow, the accumulation of the fine solid impurities on the sealing interface is reduced, the wear of the several sealing skeleton rings in the sealing channel by the fine solid impurities is reduced, the bearing end is protected, and the several sealing skeleton rings arranged in the axial direction form a multi-stage sealing system to gradually intercept the water droplets that penetrate, effectively prevent the sewage from penetrating into the motor housing, protect the core components such as the stator and the winding, and improve the waterproof performance and increase the service life of the pump body.

[0010] In a preferred example, the sealing skeleton ring comprises an elastic sealing ring body, the elastic sealing ring body is provided with a sealing inner ring extending in the circumferential direction of the elastic sealing ring body, the sealing inner ring is provided with a sealing abutting lip extending in the radial direction, the sealing abutting lip is used for abutting against the rotor shaft body, and the sealing inner ring is sleeved with a spring ring body used for continuously providing the sealing inner ring with a radial force.

[0011] By adopting the technical scheme, the spring ring body continuously provides the radial force through elastic recovery to ensure that the sealing abutting lip is always attached to the rotor shaft body and dynamically compensates for the eccentricity or wear of the rotor shaft body during rotation. At the same time, since the dustproof lip is elastic and abuts against the surface of the rotor shaft body, the dustproof lip will be elastically deformed and vibrate at a high frequency due to the friction generated by the rotation of the rotor shaft body when the rotor shaft body rotates. In this way, the inertia force generated by the vibration of the impurities attached to the surface of the dustproof lip is separated from the contact surface, the open cavity is discharged together with the water flow, and the waterproof reliability and stability of the water pump are improved.

[0012] In a preferred example, the elastic sealing ring body is internally provided with a metal support sheet.

[0013] By adopting the technical scheme, the metal support sheet can enhance the structural strength of the elastic sealing ring body to prevent plastic deformation of the sealing ring body due to excessive radial pressure and ensure the long-term stability of the sealing structure.

[0014] In a preferred example, the spring ring body is made of 304 stainless steel.

[0015] By adopting the technical scheme, 304 stainless steel has excellent corrosion resistance and is suitable for sewage working conditions.

[0016] In a preferred example, the outer side of the elastic sealing ring body is provided with a plurality of wave-shaped protrusions extending in the length direction of the elastic sealing ring body.

[0017] By adopting the above technical solution, when the elastic sealing ring is subjected to radial pressure, the wavy protrusion can increase the actual contact area between the elastic sealing ring and the motor housing and enhance the twisting force, reduce the leakage channels formed by the unevenness of the motor housing surface, and improve the waterproof effect and the tight fit.

[0018] In a preferred embodiment, this application may be further configured such that the elastic sealing ring, the inner sealing ring, and the sealing abutment lip are all made of NBR rubber.

[0019] By adopting the above technical solutions, NBR rubber has excellent elasticity, wear resistance, oil resistance and low temperature resistance, and is suitable for scenarios involving oil stains, impurities, friction and temperature changes in wastewater environments.

[0020] In a preferred embodiment, this application may be further configured such that the number of sealing skeleton rings is at least two.

[0021] By adopting the above technical solution and setting up a multi-level sealing skeleton ring, the reliability of waterproof gradient protection can be ensured.

[0022] In a preferred embodiment, this application may be further configured such that silicone grease is filled between the end sealing skeleton ring and the adjacent sealing skeleton ring.

[0023] By adopting the above technical solution, silicone grease has both lubricating and sealing functions, filling tiny gaps to form an auxiliary sealing barrier, preventing residual moisture from penetrating into the motor housing, and increasing the lubrication of the sealing skeleton ring and rotor shaft during rotation, thereby reducing the wear of the sealing skeleton and extending its service life.

[0024] In a preferred embodiment, the present application may be further configured as follows: the motor housing includes a motor outer shell and a motor inner shell, the motor outer shell wraps around and is snap-fitted with the motor inner shell, the motor outer shell has a first rotor hole, the motor inner shell has a second rotor hole, the bearing is fixedly installed in the motor inner shell and coaxially arranged with the second rotor hole, the rotor shaft passes through the first rotor hole and the second rotor hole and is rotatably installed on the bearing, a sealed channel is formed between the motor outer shell, the motor inner shell and the rotor shaft, and a sealing gasket and a sealing ring are provided at the snap-fit ​​joint between the motor outer shell and the motor inner shell.

[0025] By adopting the above technical solution, the motor housing and the motor inner housing form a double-layer snap-fit ​​structure. With the sealing gasket and sealing ring at the snap-fit ​​point, two static sealing barriers are formed at the joint between the outer and inner housings. This effectively blocks the seepage path of external water along the fitting gap. At the same time, the sealing channel formed by the motor housing and the motor inner housing provides installation space for the shaft end sealing waterproof structure, forming a multi-layer waterproof system of housing structure sealing, joint material sealing, and dynamic sealing of the sealing channel. This not only improves the overall rigidity of the motor housing to resist the impact of external water pressure and impurities, but also blocks water and impurities from entering the motor interior in all directions through the multi-layer waterproof system, significantly enhancing the sealing reliability and stability of the submersible sewage pump in sewage environments.

[0026] In a preferred embodiment, this application may be further configured such that the shaft body of the rotor is provided with a stainless steel protective layer.

[0027] By adopting the above technical solution, a stainless steel protective layer is used to cover the critical area where the rotor shaft and the seal come into contact, thereby improving the corrosion resistance and wear resistance of the rotor shaft surface and thus increasing the service life of the rotor shaft and the sealing structure.

[0028] In a preferred embodiment, this application may be further configured such that the hardness of the stainless steel protective layer is greater than HRC60.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. When the sewage pump is working, the retaining ring acts as a primary barrier, first intercepting large impurities in the sewage to prevent them from directly impacting the sealing skeleton ring. Secondly, the dustproof lip extending from the sealing skeleton ring at the first end to the shaft end abuts against the surface of the rotor shaft, forming an open inner cavity with the retaining ring. This inner cavity allows a small amount of water to enter and circulate through the rotation of the rotor shaft, thus flushing away residual fine solid impurities and reducing the accumulation of impurities at the sealing interface. This reduces the wear of the sealing skeleton rings in the sealing channel caused by fine solid impurities and also protects the bearing end. Furthermore, the several sealing skeleton rings arranged axially form a multi-stage sealing system that can intercept infiltrating water droplets step by step, effectively preventing sewage from seeping into the motor housing, protecting core components such as the stator and windings, improving waterproof performance, and increasing pump life.

[0031] 2. The spring ring provides continuous radial force through elastic recovery, ensuring that the sealing lip always fits the rotor shaft, dynamically compensating for eccentricity or wear during rotor shaft rotation. At the same time, because the dust lip is elastic and abuts against the rotor shaft surface, when the rotor shaft rotates, the dust lip will undergo elastic deformation and high-frequency micro-vibration due to the friction generated by the rotor shaft rotation. This causes impurities attached to the surface of the dust lip to detach from the contact surface due to the inertial force generated by the vibration, and then be discharged from the open cavity with the water flow, thereby improving the waterproof reliability and stability of the water pump.

[0032] 3. The motor housing and inner housing form a double-layer snap-fit ​​structure. With the sealing gasket and sealing ring at the snap-fit ​​joint, two static sealing barriers are formed at the joint between the outer and inner housings. This effectively blocks the seepage path of external water along the fitting gap. At the same time, the sealing channel formed by the motor housing and inner housing provides installation space for the shaft end sealing waterproof structure. This forms a multi-layer waterproof system with housing structure sealing, joint material sealing, and dynamic sealing of the sealing channel. This not only improves the overall rigidity of the motor housing to resist the impact of external water pressure and impurities, but also blocks water and impurities from entering the motor through the multi-layer waterproof system, significantly enhancing the sealing reliability and stability of the submersible sewage pump in sewage environments. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the waterproof sealing structure at the shaft end of the submersible sewage pump in this application;

[0034] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0035] Figure 3 This is a schematic diagram of the sealing skeleton located at the head end in this application.

[0036] Reference numerals: 1. Rotor shaft; 2. Bearing; 3. Sealing channel; 4. Retaining ring; 5. Sealing skeleton ring; 51. Elastic sealing ring body; 52. Sealing inner ring; 53. Sealing abutment lip; 54. Spring ring body; 55. Metal support plate; 56. Wavy protrusion; 6. Dustproof lip; 7. Open inner cavity; 8. Silicone grease; 9. Motor housing; 10. Motor inner housing; 11. Sealing gasket; 12. Sealing ring; 13. Stainless steel protective layer. Detailed Implementation

[0037] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0038] It should be noted that the terms "first," "second," etc., used in this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The implementation methods described in the following exemplary embodiments do not represent all implementation methods consistent with this disclosure.

[0039] Furthermore, the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article, unless otherwise specified, generally indicates that the preceding and following related objects have an "or" relationship.

[0040] The following is a reference appendix. Figure 1 To be continued Figure 3 This application describes a waterproof sealing structure for the shaft end of a submersible sewage pump.

[0041] Reference Figures 1 to 3The submersible sewage pump shaft end sealing and waterproof structure includes a motor housing and a rotor shaft 1. A bearing 2 is fixedly installed inside the motor housing. The rotor shaft 1 is rotatably mounted on the bearing 2 and extends outside the motor housing, forming a sealing channel 3 between the rotor shaft 1 and the motor housing. Along the axial direction of the rotor shaft 1, a retaining ring 4 and several sealing skeleton rings 5 ​​are sequentially arranged from the outside to the inside of the sealing channel 3. The retaining ring 4 is tightly fitted and fixedly installed outside the motor housing and coaxially with the rotor shaft 1. The retaining ring 4 is used to block large impurities in the water and is tightly fitted and fixedly installed to the motor housing so that the retaining ring 4 can stably and powerfully support the sealing skeleton rings 5. Several sealing skeleton rings 5 ​​are all sleeved on the rotor shaft 1. A dustproof lip 6 is provided on the side of the sealing skeleton ring 5 located near the rotor shaft 1, extending towards the shaft end of the rotor shaft 1. The dustproof lip 6 is used to abut against the rotor shaft 1. A water circulation system is formed between the retaining ring 4 and the dustproof lip 6. The ring has an open inner cavity 7. When the sewage pump is working, the retaining ring 4 acts as a primary barrier, firstly intercepting large impurities in the sewage to prevent them from directly impacting the sealing skeleton ring 5. Secondly, the dustproof lip 6, which extends from the sealing skeleton ring 5 at the first end to the shaft end, abuts against the surface of the rotor shaft 1, forming an open inner cavity 7 with the retaining ring 4. This inner cavity allows a small amount of water to enter and circulate through the rotation of the rotor shaft 1, thus flushing away residual fine solid impurities and reducing the accumulation of impurities at the sealing interface. This reduces the wear of the sealing skeleton rings 5 ​​in the sealing channel 3 caused by fine solid impurities, while also protecting the bearing 2 end. Furthermore, the several sealing skeleton rings 5 ​​arranged axially constitute a multi-stage sealing system, which can intercept infiltrating water droplets step by step, effectively preventing sewage from seeping into the motor housing, protecting core components such as the stator and windings, improving waterproof performance, and increasing pump life.

[0042] It should be noted that in the actual design, the shape of the retaining ring 4 can be set as stepped to give way to the impeller connected to the end of the rotor shaft 1, avoid contact with the rotor shaft 1 and the impeller, and at the same time shorten the gap between the retaining ring 4 and the rotor shaft 1 to prevent the entry of large-volume impurities.

[0043] Specifically, the sealing skeleton ring 5 includes an elastic sealing ring body 51, an inner sealing ring 52 extending along its circumference, and a sealing abutment lip 53 extending radially from the inner sealing ring 52. The sealing abutment lip 53 abuts against the rotor shaft 1. A spring ring body 54 is fitted onto the inner sealing ring 52, and the spring ring body 54 continuously provides radial force to the inner sealing ring 52. The spring ring body 54 provides continuous radial force through elastic recovery, ensuring that the sealing abutment lip 53 always fits against the rotor shaft 1, dynamically compensating for eccentricity or wear when the rotor shaft 1 rotates. At the same time, since the dustproof lip 6 is elastic and abuts against the surface of the rotor shaft 1, when the rotor shaft 1 rotates, the dustproof lip 6 will undergo elastic deformation and high-frequency micro-vibration due to the friction generated by the rotation of the rotor shaft 1. This causes impurities attached to the surface of the dustproof lip 6 to detach from the contact surface due to the inertial force generated by the vibration, and then be discharged from the open cavity with the help of water flow, thereby improving the waterproof reliability and stability of the water pump.

[0044] It should be noted that in this embodiment, the dustproof lip 6 extended from the sealing skeleton ring 5 at the first end and the sealing abutment lip 53 form a double-lip structure sealing skeleton ring 5, while the remaining sealing skeleton rings are single-lip structure sealing skeleton rings 5, which together constitute a multi-level sealing system, which can intercept the seeping water droplets step by step, effectively prevent sewage from seeping into the motor housing, protect the stator, winding and other core components, improve waterproof performance and increase pump life.

[0045] Furthermore, a metal support plate 55 is provided inside the elastic sealing ring body 51. By providing the metal support plate 55, the structural strength of the elastic sealing ring body 51 can be enhanced, so as to prevent the sealing ring 12 body from undergoing plastic deformation due to excessive radial pressure and ensure the long-term stability of the sealing structure.

[0046] Preferably, the spring coil body 54 is a 304 stainless steel spring. 304 stainless steel has excellent corrosion resistance and is suitable for sewage conditions.

[0047] Preferably, the outer side of the elastic sealing ring 51 is provided with a plurality of wavy protrusions 56 along its own length direction. When the elastic sealing ring 51 is subjected to radial pressure, the wavy protrusions 56 can increase the actual contact area between the elastic sealing ring 51 and the motor housing and enhance the twisting force, reduce the leakage channels formed by the unevenness of the motor housing surface, and improve the waterproof effect and the fastening effect.

[0048] Preferably, the elastic sealing ring 51, the inner sealing ring 52, and the sealing abutment lip 53 are all made of NBR rubber. NBR rubber has excellent elasticity, wear resistance, oil resistance, and low temperature resistance, and is suitable for scenarios involving oil stains, impurities, friction, and temperature changes in wastewater environments.

[0049] It should be noted that in this embodiment, the number of sealing skeleton rings 5 ​​is at least two. By setting multiple sealing skeleton rings 5, the reliability of waterproof gradient protection is ensured.

[0050] Preferably, the space between the end sealing ring 5 and the adjacent sealing ring 5 is filled with silicone grease 8. The silicone grease 8 has both lubricating and sealing functions, filling the tiny gaps to form an auxiliary sealing barrier, preventing residual moisture from penetrating into the motor housing, and increasing the lubrication of the sealing ring 5 and the rotor shaft 1 during rotation, thereby reducing the wear of the sealing ring and extending its service life.

[0051] In one embodiment, the motor housing includes a motor outer shell 9 and a motor inner shell 10. The motor outer shell 9 encloses and engages with the motor inner shell 10. The motor outer shell 9 has a first rotor hole, and the motor inner shell 10 has a second rotor hole. A bearing 2 is fixedly installed in the motor inner shell 10 and coaxially arranged with the second rotor hole. A rotor shaft 1 passes through the first rotor hole and the second rotor hole and is rotatably installed on the bearing 2. A sealing channel 3 is formed between the motor outer shell 9, the motor inner shell 10, and the rotor shaft 1. A sealing gasket 11 and a sealing ring 12 are provided at the engagement between the motor outer shell 9 and the motor inner shell 10. The motor outer shell 9 and the motor inner shell 10 form a double layer. The snap-fit ​​structure, together with the sealing gasket 11 and sealing ring 12 at the snap-fit ​​joint, forms two static sealing barriers at the joint between the outer shell and the inner shell. This effectively blocks the seepage path of external water along the fitting gap. At the same time, the sealing channel 3 formed by the motor outer shell 9 and the motor inner shell 10 provides installation space for the shaft end sealing waterproof structure, forming a multi-layer waterproof system of shell structure sealing, joint material sealing, and dynamic sealing of sealing channel 3. This not only improves the overall rigidity of the motor shell to resist the impact of external water pressure and impurities, but also blocks water and impurities from entering the motor through the multi-layer waterproof system, significantly enhancing the sealing reliability and stability of the submersible sewage pump in sewage environments.

[0052] Preferably, the rotor shaft 1 is provided with a stainless steel protective layer 13. The stainless steel protective layer 13 covers the key area where the rotor shaft 1 contacts the seal, thereby improving the corrosion resistance and wear resistance of the rotor shaft 1 surface and thus improving the service life of the rotor shaft 1 and the sealing structure.

[0053] Specifically, the stainless steel protective layer has a hardness greater than HRC60. This design hardness range is adopted to adapt to working conditions in wastewater environments.

[0054] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A waterproof sealing structure for the shaft end of a submersible sewage pump, characterized in that, include: The motor housing has a bearing (2) fixedly installed inside it; The rotor shaft (1) is rotatably mounted on the bearing (2) and extends out of the motor housing. A sealed channel (3) is formed between the rotor shaft (1) and the motor housing. A retaining ring (4) and several sealing skeleton rings (5) are arranged sequentially from the outside to the inside along the axial direction of the rotor shaft (1). The retaining ring (4) is fixedly installed outside the motor housing and is coaxial with the rotor shaft (1). The retaining ring (4) is used to block large-volume impurities in the water and support the sealing skeleton rings (5). Several sealing skeleton rings (5) are all sleeved on the rotor shaft (1). The sealing skeleton ring (5) at the first end extends from the side of the rotor shaft (1) toward the shaft end of the rotor shaft (1) and is provided with a dustproof lip (6). The dustproof lip (6) is used to abut against the rotor shaft (1). An open inner cavity (7) for water circulation is formed between the retaining ring (4) and the dustproof lip (6).

2. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 1, characterized in that, The sealing skeleton ring (5) includes an elastic sealing ring body (51), the elastic sealing ring body (51) extends along its own circumference and is provided with a sealing inner ring (52), the sealing inner ring (52) extends radially and is provided with a sealing abutment lip (53), the sealing abutment lip (53) is used to abut against the rotor shaft (1), and the sealing inner ring (52) is fitted with a spring ring body (54), the spring ring body (54) is used to continuously provide radial force to the sealing inner ring (52).

3. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 2, characterized in that, A metal support plate (55) is provided inside the elastic sealing ring body (51).

4. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 2, characterized in that, The spring coil body (54) is a 304 stainless steel spring.

5. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 2, characterized in that, The outer side of the elastic sealing ring (51) is provided with several wavy protrusions (56) along its own length direction.

6. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 2, characterized in that, The elastic sealing ring (51), the inner sealing ring (52), and the sealing abutment lip (53) are all made of NBR rubber.

7. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 1, characterized in that, The number of sealing skeleton rings (5) is at least two.

8. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 1, characterized in that, Silicone grease (8) is filled between the end sealing skeleton ring (5) and the adjacent sealing skeleton ring (5).

9. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 1, characterized in that, The motor housing includes a motor outer shell (9) and a motor inner shell (10). The motor outer shell (9) wraps around the motor inner shell (10) and is engaged with the motor inner shell (10). The motor outer shell (9) has a first rotor hole, and the motor inner shell (10) has a second rotor hole. The bearing (2) is fixedly installed in the motor inner shell (10) and is coaxial with the second rotor hole. The rotor shaft (1) passes through the first rotor hole and the second rotor hole and is rotatably installed on the bearing (2). A sealed channel (3) is formed between the motor outer shell (9), the motor inner shell (10) and the rotor shaft (1). A sealing gasket (11) and a sealing ring (12) are provided at the engagement between the motor outer shell (9) and the motor inner shell (10).

10. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 1, characterized in that, The rotor shaft (1) is provided with a stainless steel protective layer (13).

11. The submersible sewage pump shaft end sealing and waterproofing structure as described in claim 10, characterized in that, The hardness of the stainless steel protective layer (13) is greater than HRC60.

Images