Shaft extension sealing device and explosion-proof motor

Abstract

The utility model discloses a shaft extension sealing device and an explosion-proof motor, and relates to the technical field of explosion-proof motors, the shaft extension sealing device comprises a motor protection part, a rotor shaft, a static ring and a moving ring, and the motor protection part is provided with a through hole; the rotor shaft penetrates through the through hole and extends from the first side of the motor protection part to the second side of the motor protection part; the static ring is arranged on the motor protection part, and the periphery of the static ring is hermetically connected with the inner wall of the through hole; the moving ring is arranged on the rotor shaft, the inner circumference of the moving ring is in sealing connection with the outer wall of the rotor shaft, and the moving ring is matched with the static ring so as to achieve sealing protection when the rotor shaft moves relative to the motor protection component. According to the shaft extension sealing device, through cooperation of the static ring and the moving ring, sealing protection of the rotor shaft when the rotor shaft moves relative to the motor protection component is achieved, and the problems that in the prior art, the shaft extension sealing performance is insufficient, and explosion prevention and the IP68 protection level are difficult to consider are effectively solved.

Description

Technical Field

[0001] This application relates to the field of explosion-proof motor technology, and in particular to a shaft extension sealing device and an explosion-proof motor. Background Technology

[0002] In the industrial sector, explosion-proof motors are widely used in flammable and explosive environments such as petroleum, chemical, and coal mines. Their core requirement is to prevent explosions caused by electrical sparks or high temperatures, while also adapting to complex operating conditions such as high humidity, dust, and liquid intrusion. The shaft extension end protection design of explosion-proof motors is crucial to ensuring the reliability and safety of the motor in harsh environments.

[0003] However, existing explosion-proof motors suffer from significant technical bottlenecks in the protection design of the shaft extension end. The shaft extension sealing performance is insufficient, making it difficult to simultaneously meet the requirements of explosion-proof and IP68 protection levels. The mainstream sealing methods are mostly skeleton oil seals or V-rings, which are inadequate in dust and water resistance, failing to effectively prevent the intrusion of dust and liquids, thus affecting the normal operation and service life of the motor. Utility Model Content

[0004] The purpose of this application is to provide a shaft extension sealing device that, through the cooperation of a stationary ring and a moving ring, achieves sealing protection of the rotor shaft when it moves relative to the motor's protective components, effectively solving the problems of insufficient shaft extension sealing performance and difficulty in simultaneously achieving explosion-proof and IP68 protection levels in the prior art. Another purpose of this application is to provide an explosion-proof motor.

[0005] To achieve the above objectives, this application provides a shaft extension sealing device, comprising:

[0006] The motor protective components are equipped with perforations;

[0007] A rotor shaft passes through the through hole, and the rotor shaft extends from the first side of the motor protection component to the second side of the motor protection component;

[0008] A stationary ring is provided on the motor protection component, and the outer periphery of the stationary ring is sealed to the inner wall of the perforation;

[0009] A moving ring is disposed on the rotor shaft. The inner circumference of the moving ring is sealed to the outer wall of the rotor shaft. The moving ring cooperates with the stationary ring to achieve sealing protection when the rotor shaft moves relative to the motor protection component.

[0010] In some embodiments, the stationary ring has a recessed space, and the moving ring has a protruding structure. The protruding structure is inserted into the interior of the recessed space, thereby achieving the engagement between the moving ring and the stationary ring between the protruding structure and the recessed space.

[0011] In some embodiments, both the protruding structure and the recessed space extend in a direction parallel to the axial direction of the rotor shaft. In the radial direction of the rotor shaft, a mating structure is provided between the protruding structure and the recessed space, through which the mating structure enables the mating of the moving ring and the stationary ring.

[0012] In some embodiments, the mating structure is located on the side of the protruding structure facing the rotor shaft in the radial direction of the rotor shaft.

[0013] In some embodiments, the surface of the protruding structure is provided with a mounting groove; the mating structure is disposed in the mounting groove, and the portion of the mating structure outside the mounting groove contacts the recessed space; and / or...

[0014] The mating structure is a sealing ring.

[0015] In some embodiments, the motion ring is provided with a first mounting structure. On the radial side of the rotor shaft, the first mounting structure is provided with a first sealing groove on the side facing the rotor shaft. The first sealing groove is provided with a first sealing structure, and the inner circumference of the motion ring and the outer wall of the rotor shaft are sealed together by the first sealing structure.

[0016] In some embodiments, the moving ring has a protruding structure, and the stationary ring includes a second mounting structure having a first extension and a second extension;

[0017] In the radial direction of the rotor shaft, the distance between the side of the protruding structure facing the rotor shaft and the rotor shaft is greater than the distance between the side of the first mounting structure facing the rotor shaft and the rotor shaft, thus forming a first mating space on the side of the protruding structure facing the rotor shaft;

[0018] In the radial direction of the rotor shaft, the distance between the side of the protruding structure facing away from the rotor shaft and the inner wall of the through hole is greater than the distance between the side of the second mounting structure facing away from the rotor shaft and the inner wall of the through hole, thus forming a second mating space on the side of the protruding structure facing away from the rotor shaft.

[0019] The first extension is inserted into the first mating space, and the second extension is inserted into the second mating space, forming a recessed space between the first extension and the second extension for the protruding structure to be inserted.

[0020] In some embodiments, the stationary ring is provided with a second mounting structure. On the radial side of the rotor shaft, the second mounting structure is provided with a second sealing groove on the side opposite to the rotor shaft. The second sealing groove is provided with a second sealing structure, and the outer periphery of the stationary ring is sealed to the inner wall of the perforation through the second sealing structure.

[0021] In some embodiments, the stationary ring is provided with a sewage discharge channel, a first end of which leads to a first side of the motor protection component, and a second end of which leads to a second side of the motor protection component; and / or,

[0022] The stationary ring and the moving ring are made of cast copper.

[0023] This application also provides an explosion-proof motor, including the aforementioned shaft extension sealing device.

[0024] Compared to the aforementioned background technology, the shaft extension sealing device provided in this application mainly includes a motor protection component, a rotor shaft, a stationary ring, and a moving ring. The motor protection component has a through hole; the rotor shaft passes through the through hole and extends from the first side of the motor protection component to the second side of the motor protection component; the stationary ring is disposed in the motor protection component, and the outer circumference of the stationary ring is sealed to the inner wall of the through hole; the moving ring is disposed in the rotor shaft, and the inner circumference of the moving ring is sealed to the outer wall of the rotor shaft. The moving ring and the stationary ring cooperate to achieve sealing protection when the rotor shaft moves relative to the motor protection component.

[0025] In existing technologies, the sealing performance of the shaft extension end of explosion-proof motors is significantly insufficient, making it difficult to simultaneously meet the requirements of explosion-proof and IP68 protection levels. Traditional sealing methods mostly employ skeleton oil seals or V-rings, but these methods have deficiencies in dust and water resistance, failing to effectively prevent the intrusion of dust and liquids, thus affecting the normal operation and service life of the motor. To address this technical problem, this application provides an innovative shaft extension sealing device that, through a unique structural design, effectively solves the problem of insufficient sealing performance in existing technologies.

[0026] The shaft extension sealing device provided in this application mainly includes a motor protection component, a rotor shaft, a stationary ring, and a moving ring. The motor protection component, as the basic structure of the entire device, has a through-hole to accommodate the rotor shaft. The rotor shaft passes through the through-hole of the motor protection component and extends from one side to the other, ensuring that the rotor shaft can move freely within the motor protection component. The stationary ring is fixedly installed on the motor protection component, and its outer circumference is tightly fitted with the inner wall of the through-hole through a sealing connection, thereby forming a sealed barrier between the motor protection component and the rotor shaft. The moving ring is installed on the rotor shaft, and its inner circumference is tightly fitted with the outer wall of the rotor shaft through a sealing connection, ensuring that the moving ring can move with the rotor shaft.

[0027] The key lies in the fit between the moving and stationary rings. This fit design ensures that the stationary and moving rings maintain a constant seal as the rotor shaft moves relative to the motor's protective components. The stationary ring is fixed to the motor's protective components, while the moving ring moves with the rotor shaft. The sealed fit effectively prevents external dust, liquids, and other contaminants from entering the motor, while also preventing leakage of internal lubricating oil and other substances. This sealing design not only improves the motor's dustproof and waterproof performance but also ensures reliable operation in harsh environments, meeting the requirements for explosion-proof and IP68 protection ratings.

[0028] Based on the above structural and process descriptions, it can be seen that the shaft extension sealing device has at least the following beneficial effects: the shaft extension sealing device, through the cooperation of the stationary ring and the moving ring, achieves sealing protection of the rotor shaft when it moves relative to the motor protection components, effectively solving the problems of insufficient shaft extension sealing performance and difficulty in simultaneously achieving explosion-proof and IP68 protection levels in the prior art. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0030] Figure 1 A schematic diagram of the shaft extension sealing device provided in the embodiments of this application;

[0031] Figure 2 A schematic diagram of a stationary ring provided in an embodiment of this application;

[0032] Figure 3 A schematic diagram of the motion ring provided in an embodiment of this application;

[0033] Figure 4 This is a schematic diagram of an explosion-proof motor provided in an embodiment of this application.

[0034] in:

[0035] Shaft extension sealing device 100

[0036] Motor protection component 1, perforation 11,

[0037] Rotor shaft 2

[0038] 3. Stationary ring; 31. Recessed space; 32. Second mounting structure; 321. Second sealing groove; 322. Second sealing structure; 33. First extension; 34. Second extension; 35. Drainage channel.

[0039] 4. Moving ring; 41. Protruding structure; 411. Mounting groove; 42. First mounting structure; 421. First sealing groove; 422. First sealing structure; 43. First mating space; 44. Second mating space.

[0040] Matching structure 5,

[0041] Stator 6

[0042] End cap 7

[0043] 8. Bearing outer cover. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] Please refer to Figures 1 to 4 ,in, Figure 1 This is a schematic diagram of the shaft extension sealing device provided in the embodiments of this application. Figure 2 This is a schematic diagram of a stationary ring provided in an embodiment of this application. Figure 3 This is a schematic diagram of the motion ring provided in an embodiment of this application. Figure 4 This is a schematic diagram of an explosion-proof motor provided in an embodiment of this application.

[0047] In a first specific embodiment, the shaft extension sealing device 100 provided in this application mainly includes a motor protection component 1, a rotor shaft 2, a stationary ring 3, and a moving ring 4. The motor protection component 1 is provided with a through hole 11; the rotor shaft 2 passes through the through hole 11 and extends from the first side of the motor protection component 1 to the second side of the motor protection component 1; the stationary ring 3 is provided on the motor protection component 1, and the outer periphery of the stationary ring 3 is sealed to the inner wall of the through hole 11; the moving ring 4 is provided on the rotor shaft 2, and the inner periphery of the moving ring 4 is sealed to the outer wall of the rotor shaft 2. The moving ring 4 cooperates with the stationary ring 3 to achieve sealing protection when the rotor shaft 2 moves relative to the motor protection component 1.

[0048] In existing technologies, the sealing performance of the shaft extension end of explosion-proof motors is significantly insufficient, making it difficult to simultaneously meet the requirements of explosion-proof and IP68 protection levels. Traditional sealing methods mostly employ skeleton oil seals or V-rings, but these methods have deficiencies in dust and water resistance, failing to effectively prevent the intrusion of dust and liquids, thus affecting the normal operation and service life of the motor. To address this technical problem, this application provides an innovative shaft extension sealing device 100, which, through a unique structural design, effectively solves the problem of insufficient sealing performance in existing technologies.

[0049] The shaft extension sealing device 100 provided in this application mainly includes a motor protection component 1, a rotor shaft 2, a stationary ring 3, and a moving ring 4. The motor protection component 1, as the basic structure of the entire device, has a through hole 11 for accommodating the rotor shaft 2. The rotor shaft 2 passes through the through hole 11 of the motor protection component 1 and extends from a first side to a second side, ensuring that the rotor shaft 2 can move freely within the motor protection component 1. The stationary ring 3 is fixedly installed on the motor protection component 1, and its outer circumference is tightly fitted with the inner wall of the through hole 11 through a sealing connection, thereby forming a sealed barrier between the motor protection component 1 and the rotor shaft 2. The moving ring 4 is installed on the rotor shaft 2, and its inner circumference is tightly fitted with the outer wall of the rotor shaft 2 through a sealing connection, ensuring that the moving ring 4 can move together with the rotor shaft 2.

[0050] The key lies in the fit between the moving ring 4 and the stationary ring 3. This fit design ensures that the stationary ring 3 and the moving ring 4 maintain a constant seal as the rotor shaft 2 moves relative to the motor protective component 1. The stationary ring 3 is fixed to the motor protective component 1, while the moving ring 4 moves with the rotor shaft 2. The sealed fit between them effectively prevents external dust, liquids, and other contaminants from entering the motor, while also preventing leakage of internal lubricating oil and other substances. This sealing design not only improves the motor's dustproof and waterproof performance but also ensures reliable operation in harsh environments, meeting the requirements for explosion-proof and IP68 protection levels.

[0051] Based on the above structural and process descriptions, it can be seen that the shaft extension sealing device 100 has at least the following beneficial effects: the shaft extension sealing device 100, through the cooperation of the stationary ring 3 and the moving ring 4, achieves sealing protection of the rotor shaft 2 when it moves relative to the motor protection component 1, effectively solving the problems of insufficient shaft extension sealing performance and difficulty in simultaneously achieving explosion-proof and IP68 protection levels in the prior art.

[0052] In some cases, the shaft extension sealing device 100 is suitable for explosion-proof motors, especially an explosion-proof motor with a shaft extension protection rating of IP68; the motor protection component 1 can be a bearing cover or end cover on the housing of the explosion-proof motor, which is not limited here; the way the stationary ring 3 and the moving ring 4 are matched can be by a labyrinth seal between them, which should also be within the scope of this embodiment.

[0053] like Figure 4 As shown, the explosion-proof motor includes a housing, end cover 7, bearing outer cover 8, rotor shaft 2, and stator 6. The working principle of the explosion-proof motor is not part of the improvements in this embodiment and will not be described in detail here. The shaft extension sealing device 100 will be described in detail below.

[0054] In some embodiments, the stationary ring 3 is provided with a recessed space 31, and the moving ring 4 is provided with a protruding structure 41. The protruding structure 41 is inserted into the interior of the recessed space 31, and the moving ring 4 and the stationary ring 3 are engaged between the protruding structure 41 and the recessed space 31.

[0055] In this embodiment, the stationary ring 3 has a recessed space 31, and the moving ring 4 has a protruding structure 41. This structural design allows the protruding structure 41 to be inserted into the recessed space 31. This combination of recess and protrusion further ensures a tight fit between the moving ring 4 and the stationary ring 3. This fit not only enhances the sealing performance between the two but also provides a structural basis for achieving a higher level of protection.

[0056] Specifically, the cooperation between the protruding structure 41 and the recessed space 31 can form a labyrinth-type sealing structure. A labyrinth seal is a sealing method that uses a complex channel design to prevent fluid flow. It effectively prevents external contaminants such as dust and liquids from entering the motor, while also preventing leakage of internal lubricating oil and other substances. This sealing structure design ensures a good sealing effect even when the rotor shaft 2 moves relative to the motor protection component 1, thereby improving the reliability and protective performance of the entire shaft extension sealing device 100.

[0057] In some embodiments, both the protruding structure 41 and the recessed space 31 extend in a direction parallel to the axial direction of the rotor shaft 2. In the radial direction of the rotor shaft 2, a mating structure 5 is provided between the protruding structure 41 and the recessed space 31, and the mating structure 5 enables the mating of the moving ring 4 and the stationary ring 3.

[0058] In this embodiment, both the protruding structure 41 and the recessed space 31 extend in a direction parallel to the axial direction of the rotor shaft 2. This design not only clarifies the specific directional form of the labyrinth seal but also ensures the axial continuity and stability of the sealing structure. In this way, the sealing effect between the moving ring 4 and the stationary ring 3 is significantly improved.

[0059] The protruding structure 41 and the recessed space 31 are provided with a mating structure 5 in the radial direction of the rotor shaft 2. The mating structure 5 is located in the radial gap between the protruding structure 41 and the recessed space 31, playing a crucial sealing role. This design effectively prevents leakage of liquids and gases in the direction parallel to the axial direction of the rotor shaft 2. Because the mating structure 5 is located in the radial gap, it can form a complex sealing path between the moving ring 4 and the stationary ring 3, thereby significantly improving the sealing performance.

[0060] The advantage of this structural design is that the mating structure 5 maintains a good sealing effect even when the rotor shaft 2 moves relative to the motor protective component 1. By setting the mating structure 5 radially, the labyrinth seal can effectively prevent the intrusion of external contaminants and the leakage of internal media in the axial direction, thereby ensuring reliable operation of the motor in harsh environments. This sealing method not only improves the overall performance of the shaft extension sealing device 100, but also meets the requirements of explosion-proof and IP68 protection levels.

[0061] In some embodiments, the mating structure 5 is located on the side of the protruding structure 41 facing the rotor shaft 2 in the radial direction of the rotor shaft 2.

[0062] In this embodiment, the mating structure 5 is located on the side of the protruding structure 41 facing the rotor shaft 2 in the radial direction. This design places the mating structure 5 inside the protruding structure 41, rather than outside, so that the mating structure 5 is enclosed by the recessed space 31. This structural layout not only enhances the stability of the mating structure 5, but also further improves the sealing effect.

[0063] By placing the mating structure 5 inside the protruding structure 41, the recessed space 31 effectively encloses the mating structure 5, thereby forming a tighter sealing area between the moving ring 4 and the stationary ring 3. This design allows the mating structure 5 to maintain a stable position during the movement of the rotor shaft 2, preventing seal failure due to mechanical vibration or axial force. Simultaneously, because the mating structure 5 is enclosed by the recessed space 31, external dust and liquids are less likely to penetrate the sealing area, thus improving the reliability of the entire sealing system.

[0064] Furthermore, the inner fitting structure 5 better adapts to the radial movement of the rotor shaft 2, reducing the impact of clearance changes caused by movement on the sealing performance. In practical applications, this design effectively prevents leakage of lubricating oil and other media inside the motor, while also preventing external contaminants from entering the motor, ensuring normal operation of the motor in harsh environments. Therefore, this embodiment significantly improves the sealing performance and stability of the shaft extension sealing device 100 by optimizing the position of the fitting structure 5.

[0065] In some embodiments, the surface of the protruding structure 41 is provided with a mounting groove 411; the mating structure 5 is provided in the mounting groove 411, and the portion of the mating structure 5 outside the mounting groove 411 contacts the recessed space 31.

[0066] In this embodiment, the surface of the protruding structure 41 is provided with a mounting groove 411, and the mating structure 5 is installed in the mounting groove 411. This design clarifies the installation method of the mating structure 5, that is, the mating structure 5 is fixed by providing a mounting groove 411 on the surface of the protruding structure 41. This installation method not only ensures the stability and reliability of the mating structure 5, but also provides a structural basis for achieving an effective seal.

[0067] Specifically, the portion of the mating structure 5 outside the mounting groove 411 contacts the recessed space 31. When the rotor shaft 2 moves, the mating structure 5 moves along with the rotor shaft 2. Because there is contact between the mating structure 5 and the recessed space 31, this contact effectively prevents leakage of liquids and gases between the first and second sides of the motor protection component 1. In this way, the contact between the mating structure 5 and the recessed space 31 forms a dynamic seal, ensuring that the sealing performance is maintained even during the movement of the rotor shaft 2.

[0068] The advantage of this design is that by providing a mounting groove 411 on the surface of the protruding structure 41, the position and shape of the mating structure 5 can be precisely controlled, thereby optimizing the sealing effect. At the same time, the contact between the mating structure 5 and the recessed space 31 can not only effectively prevent the intrusion of external contaminants, but also prevent the leakage of internal media, thereby improving the reliability and protective performance of the entire shaft extension sealing device 100.

[0069] In some embodiments, the mating structure 5 is a sealing ring.

[0070] In this embodiment, the mating structure 5 is specifically a sealing ring, preferably an O-ring. This sealing ring serves as the contact method between the stationary ring 3 and the moving ring 4, ensuring the sealing performance between them. Meanwhile, other positions of the stationary ring 3 and the moving ring 4 are preferably not in contact to reduce friction and wear, thereby improving the service life and reliability of the device.

[0071] By using an O-ring as the mating structure 5, the sealing effect between the stationary ring 3 and the moving ring 4 is significantly improved. The elastic properties of the O-ring allow it to maintain tight contact with the stationary ring 3 as the moving ring 4 moves with the rotor shaft 2, effectively preventing leakage of liquids and gases between the first and second sides of the motor protection component 1. This sealing method not only improves sealing performance but also reduces wear caused by mechanical contact, ensuring smooth operation of the rotor shaft 2.

[0072] Furthermore, based on this sealing design, and through precise tolerance fitting and concentricity adjustment, the entire shaft extension sealing device 100 can ensure the smooth operation of the rotor shaft 2 while ensuring that the shaft-through portion achieves an IP68 protection rating. This means that even in extremely harsh environments, such as high humidity, dust, and liquid intrusion, the motor interior can maintain a good sealing condition, thus meeting the requirements for explosion-proof and high protection levels. This design not only improves the reliability and safety of the motor but also extends its service life.

[0073] In some embodiments, the motion ring 4 is provided with a first mounting structure 42. On the radial side of the rotor shaft 2, the first mounting structure 42 is provided with a first sealing groove 421 on the side facing the rotor shaft 2. The first sealing groove 421 is provided with a first sealing structure 422. The inner circumference of the motion ring 4 and the outer wall of the rotor shaft 2 are sealed together through the first sealing structure 422.

[0074] In this embodiment, the moving ring 4 is provided with a first mounting structure 42. On the radial side of the rotor shaft 2, the first mounting structure 42 has a first sealing groove 421 facing the rotor shaft 2, and a first sealing structure 422 is provided in the first sealing groove 421. This design achieves a sealed connection between the inner circumference of the moving ring 4 and the outer wall of the rotor shaft 2 through the first sealing structure 422, ensuring the sealing performance between the two.

[0075] This sealing method provides a clear structural basis for the seal between the moving ring 4 and the rotor shaft 2. The design of the first sealing groove 421 and the first sealing structure 422 allows the sealing structure to fit tightly against the outer wall of the rotor shaft 2, thereby effectively preventing leakage of liquid and gas between the moving ring 4 and the rotor shaft 2. This design not only improves the reliability of the seal but also provides a stable sealing environment for the moving ring 4 to operate with the rotor shaft 2.

[0076] Furthermore, this embodiment does not limit the specific installation method of the moving ring 4 and the rotor shaft 2. For example, the moving ring 4 can be installed on the rotor shaft 2 using an interference fit, thereby ensuring that the moving ring 4 can rotate with the rotor shaft 2. An interference fit is a common mechanical installation method that ensures a firm and stable connection between the moving ring 4 and the rotor shaft 2 by creating a tight mechanical fit. This installation method not only ensures that the moving ring 4 rotates with the rotor shaft 2, but also further enhances the sealing performance, ensuring that the moving ring 4 and the rotor shaft 2 maintain a good sealing state during operation.

[0077] In some embodiments, the moving ring 4 is provided with a protruding structure 41; in the radial direction of the rotor shaft 2, the distance between the side of the protruding structure 41 facing the rotor shaft 2 and the rotor shaft 2 is greater than the distance between the side of the first mounting structure 42 facing the rotor shaft 2 and the rotor shaft 2, forming a first mating space 43 on the side of the protruding structure 41 facing the rotor shaft 2; in the radial direction of the rotor shaft 2, the distance between the side of the protruding structure 41 away from the rotor shaft 2 and the inner wall of the through hole 11 is greater than the distance between the side of the second mounting structure 32 away from the rotor shaft 2 and the inner wall of the through hole 11, forming a second mating space 44 on the side of the protruding structure 41 away from the rotor shaft 2; the stationary ring 3 includes a second mounting structure 32 provided with a first extension 33 and a second extension 34, the first extension 33 is inserted into the first mating space 43, the second extension 34 is inserted into the second mating space 44, and a recessed space 31 for the protruding structure 41 to be inserted is formed between the first extension 33 and the second extension 34.

[0078] In this embodiment, the moving ring 4 is provided with a protruding structure 41, which is cleverly designed to cooperate with the structure of the stationary ring 3, forming a unique sealing and mating mechanism. Specifically, in the radial direction of the rotor shaft 2, the distance between the side of the protruding structure 41 facing the rotor shaft 2 and the rotor shaft 2 is greater than the distance between the side of the first mounting structure 42 facing the rotor shaft 2 and the rotor shaft 2. This design naturally forms a first mating space 43 on the side of the protruding structure 41 facing the rotor shaft 2. The formation of this space provides an insertion position for the first extension 33 in the stationary ring 3, thereby realizing the initial mating between the moving ring 4 and the stationary ring 3.

[0079] Furthermore, in the radial direction of the rotor shaft 2, the distance between the side of the protruding structure 41 facing away from the rotor shaft 2 and the inner wall of the through hole 11 is greater than the distance between the side of the second mounting structure 32 facing away from the rotor shaft 2 and the inner wall of the through hole 11. This ingenious design forms a second mating space 44 on the side of the protruding structure 41 facing away from the rotor shaft 2. The existence of this space provides an insertion position for the second extension 34 in the stationary ring 3, further strengthening the fit between the moving ring 4 and the stationary ring 3.

[0080] The design of the stationary ring 3 is equally ingenious, comprising a second mounting structure 32 with a first extension 33 and a second extension 34. The first extension 33 is inserted into the first mating space 43, while the second extension 34 is inserted into the second mating space 44. This design not only achieves a tight fit between the stationary ring 3 and the moving ring 4, but also provides a precise insertion position for the protruding structure 41 through the recessed space 31 between the first extension 33 and the second extension 34. This concave-convex combination is reflected not only in the fit between the recessed space 31 and the protruding structure 41, but also in the mutual fit between the first extension 33 and the first mating space 43, and between the second extension 34 and the second mating space 44.

[0081] This design ensures a tighter and more stable fit between the stationary ring 3 and the moving ring 4. This concave-convex combination structure not only enhances sealing performance but also improves the reliability and protective performance of the entire shaft extension sealing device 100. In practical applications, this structure effectively prevents the intrusion of external contaminants and the leakage of internal media, ensuring the normal operation of the motor in harsh environments.

[0082] In some cases, the second sealing groove 321 is provided on the first extension 33 of the second mounting structure 32.

[0083] In some embodiments, the stationary ring 3 is provided with a second mounting structure 32. On the radial side of the rotor shaft 2, the second mounting structure 32 is provided with a second sealing groove 321 on the side facing away from the rotor shaft 2. The second sealing groove 321 is provided with a second sealing structure 322. The sealing connection between the outer periphery of the stationary ring 3 and the inner wall of the perforation 11 is achieved through the second sealing structure 322.

[0084] In this embodiment, the stationary ring 3 is provided with a second mounting structure 32, which has a second sealing groove 321 on the side of the rotor shaft 2 facing away from the rotor shaft 2 in the radial direction. A second sealing structure 322 is provided within the second sealing groove 321. Through the second sealing structure 322, a sealed connection is achieved between the outer periphery of the stationary ring 3 and the inner wall of the through hole 11 of the motor protection component 1. This design ensures the sealing performance between the stationary ring 3 and the motor protection component 1, effectively preventing external contaminants from entering the motor and preventing leakage of the internal medium.

[0085] It is worth noting that this embodiment only specifies the sealing method between the stationary ring 3 and the motor protection component 1, and does not specify the specific installation method. For example, the stationary ring 3 can be installed in the through hole 11 of the motor protection component 1 using an interference fit. An interference fit is a common mechanical installation method. By creating a tight mechanical fit between the stationary ring 3 and the inner wall of the through hole 11, the connection between the two is ensured to be firm and stable. This installation method not only ensures the stable position of the stationary ring 3, but also further enhances the sealing performance, ensuring that the stationary ring 3 and the motor protection component 1 maintain a good sealing state during operation.

[0086] This design ensures a reliable sealing connection between the stationary ring 3 and the motor protection component 1, providing crucial support for the high-performance operation of the entire shaft extension sealing device 100. This sealing method not only improves the reliability of the seal but also provides strong protection for the normal operation of the motor in harsh environments.

[0087] In some embodiments, the stationary ring 3 is provided with a drain channel 35, the first end of which leads to the first side of the motor protection component 1, and the second end of which leads to the second side of the motor protection component 1.

[0088] In this embodiment, the stationary ring 3 is provided with a sewage discharge channel 35, the first end of which leads to the first side of the motor protection component 1, and the second end leads to the second side of the motor protection component 1. This design provides an effective solution for the discharge of waste grease.

[0089] By incorporating the drain channel 35, waste grease generated inside the motor can be easily discharged. This function not only helps maintain the cleanliness of the motor's interior but also prevents the accumulation of waste grease, thus avoiding mechanical failures and performance degradation that may result from grease buildup. Furthermore, the drain channel 35 can replace the traditional oil drain hole on the bearing cover, further simplifying the motor's structural design and improving overall sealing performance and reliability.

[0090] The design of this drainage channel 35 not only provides an efficient and reliable way to discharge waste oil, but also enhances the motor's adaptability to harsh environments and ease of maintenance. In this way, the motor's service life and operating efficiency are significantly improved.

[0091] In some embodiments, the stationary ring 3 and the moving ring 4 are made of cast copper.

[0092] In this embodiment, the stationary ring 3 and the moving ring 4 are made of cast copper, which means that the main structure of the shaft extension sealing device 100 is made of copper. Cast copper has excellent heat dissipation performance, which is better than that of cast aluminum and cast iron. It can effectively reduce the heat accumulation generated by the motor during operation, thereby ensuring the stable operation of the motor. This material selection not only improves the reliability of the shaft extension sealing device 100 in high-temperature environments, but also extends the service life of the motor.

[0093] Due to its superior heat dissipation properties, cast copper can quickly conduct the heat generated during motor operation to the outside, preventing deformation or damage to the sealing components caused by heat accumulation. This characteristic is particularly important for explosion-proof motors, as they are typically used in flammable and explosive environments where excessively high temperatures could lead to safety issues. By using cast copper, the stationary ring 3 and the moving ring 4 can effectively control the temperature while ensuring sealing performance, thus guaranteeing the safety and reliability of the motor under complex operating conditions.

[0094] Furthermore, the cast copper material possesses excellent mechanical properties and corrosion resistance, enabling it to adapt to various harsh working environments and further enhancing the overall performance of the shaft extension seal device 100. This material selection provides a strong guarantee for the long-term stable operation of the motor.

[0095] This application also provides an explosion-proof motor that integrates the aforementioned shaft extension sealing device 100. Due to the use of this shaft extension sealing device 100, the explosion-proof motor possesses all its beneficial technical effects, including but not limited to a high protection rating (such as IP68), reliable sealing performance, and good heat dissipation characteristics. These characteristics enable the motor to maintain stable operation in various harsh environments, significantly improving the motor's reliability and service life.

[0096] In certain special applications, such as marine deck motors and submersible pump motors, the environments are typically harsh, with the motors constantly exposed to rain, high humidity, dust, and other complex conditions. Traditional shaft extension protection structures often struggle to maintain reliability in such environments, prone to problems like seal failure, internal water or dust ingress, leading to motor malfunctions. However, the explosion-proof motor provided in this application effectively solves this problem through its unique shaft extension sealing device 100. The cast copper material of the stationary ring 3 and the moving ring 4 not only provides excellent heat dissipation but also enhances the corrosion resistance and mechanical strength of the components. Simultaneously, the labyrinth seal structure and the multiple designs of the sealing rings ensure that the motor shaft extension maintains a high degree of sealing during dynamic operation, preventing external contaminants from entering and internal media from leaking.

[0097] The explosion-proof motor of this application is particularly suitable for these special occasions, and can significantly improve the reliability and stability of the motor in harsh environments, providing a more reliable solution for related industrial applications.

[0098] It should be noted that many of the components mentioned in this application are general standard parts or components known to those skilled in the art, and their structure and principle can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0099] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0100] The shaft extension sealing device and explosion-proof motor provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A shaft extension sealing device, characterized in that, include: The motor protective components are equipped with perforations; A rotor shaft passes through the through hole, and the rotor shaft extends from the first side of the motor protection component to the second side of the motor protection component; A stationary ring is provided on the motor protection component, and the outer periphery of the stationary ring is sealed to the inner wall of the perforation; A moving ring is disposed on the rotor shaft. The inner circumference of the moving ring is sealed to the outer wall of the rotor shaft. The moving ring cooperates with the stationary ring to achieve sealing protection when the rotor shaft moves relative to the motor protection component.

2. The shaft extension sealing device according to claim 1, characterized in that, The stationary ring has a recessed space, and the moving ring has a protruding structure. The protruding structure is inserted into the interior of the recessed space, and the moving ring and the stationary ring are engaged between the protruding structure and the recessed space.

3. The shaft extension sealing device according to claim 2, characterized in that, Both the protruding structure and the recessed space extend in a direction parallel to the axial direction of the rotor shaft. In the radial direction of the rotor shaft, a mating structure is provided between the protruding structure and the recessed space, through which the moving ring and the stationary ring are mated.

4. The shaft extension sealing device according to claim 3, characterized in that, In the radial direction of the rotor shaft, the mating structure is located on the side of the protruding structure facing the rotor shaft.

5. The shaft extension sealing device according to claim 3, characterized in that, The surface of the protruding structure is provided with a mounting groove; the mating structure is disposed in the mounting groove, and the portion of the mating structure outside the mounting groove contacts the recessed space; and / or... The mating structure is a sealing ring.

6. The shaft extension sealing device according to claim 1, characterized in that, The moving ring is provided with a first mounting structure. On the radial side of the rotor shaft, the first mounting structure is provided with a first sealing groove on the side facing the rotor shaft. The first sealing groove is provided with a first sealing structure, and the inner circumference of the moving ring and the outer wall of the rotor shaft are sealed together by the first sealing structure.

7. The shaft extension sealing device according to claim 6, characterized in that, The moving ring has a protruding structure, and the stationary ring includes a second mounting structure having a first extension and a second extension. In the radial direction of the rotor shaft, the distance between the side of the protruding structure facing the rotor shaft and the rotor shaft is greater than the distance between the side of the first mounting structure facing the rotor shaft and the rotor shaft, thus forming a first mating space on the side of the protruding structure facing the rotor shaft; In the radial direction of the rotor shaft, the distance between the side of the protruding structure facing away from the rotor shaft and the inner wall of the through hole is greater than the distance between the side of the second mounting structure facing away from the rotor shaft and the inner wall of the through hole, thus forming a second mating space on the side of the protruding structure facing away from the rotor shaft. The first extension is inserted into the first mating space, and the second extension is inserted into the second mating space, forming a recessed space between the first extension and the second extension for the protruding structure to be inserted.

8. The shaft extension sealing device according to claim 1, characterized in that, The stationary ring is provided with a second mounting structure. On the radial side of the rotor shaft, the second mounting structure is provided with a second sealing groove on the side opposite to the rotor shaft. The second sealing groove is provided with a second sealing structure, which realizes the sealing connection between the outer periphery of the stationary ring and the inner wall of the perforation.

9. The shaft extension sealing device according to claim 1, characterized in that, The stationary ring is provided with a sewage discharge channel, the first end of which leads to the first side of the motor protection component, and the second end of which leads to the second side of the motor protection component; and / or, The stationary ring and the moving ring are made of cast copper.

10. An explosion-proof motor, characterized in that, Includes the shaft extension sealing device as described in any one of claims 1 to 9.

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