Sealing assembly and reduction gearbox
By forming a labyrinth seal through the inner and outer sealing lips, and designing an oil return chamber and oil return port, the problem of poor sealing between the gearbox housing and the shaft of the unwinding machine is solved, achieving better sealing effect and equipment stability.
Patent Information
- Application Number
- CN202520015809.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-03
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-03
AI Technical Summary
In the existing technology, the sealing effect between the housing and the rotating shaft of the unwinding machine gearbox is not good, which leads to oil leakage and poses a hidden danger to the equipment. At best, it will cause a minor shutdown, and at worst, it will cause damage to the bearings.
The inner and outer sealing lips form two labyrinth seals. Combined with the oil return chamber design, the oil flowing into the oil return chamber is returned to the housing through the oil return port to prevent oil leakage.
It improves the sealing effect, prevents oil leakage, ensures the sealing between the shaft and the housing, avoids potential equipment hazards, and ensures stable operation of the equipment.
Smart Images
Figure CN223740015U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of seals, and particularly relates to a sealing assembly and a reduction gearbox. BACKGROUND
[0002] The reliability of the uncoiler machine, as one of the important equipment in the production line, is related to the stable operation of the entire unit. Whether the oil leaks at the sealing position between the shell and the rotating shaft of the uncoiler machine reduction gearbox is an important control point of the uncoiler machine, and is one of the key points of daily inspection and maintenance.
[0003] In the related art, the gap between the shell and the rotating shaft is sealed by a skeleton oil seal, the skeleton oil seal is sleeved on the rotating shaft and in sealing contact with the rotating shaft, and the skeleton oil seal is fixed on the shell and in sealing connection with the shell. Due to the structure of the skeleton oil seal, long-time operation of the uncoiler machine will cause wear at the contact position between the skeleton oil seal and the rotating shaft, resulting in sealing failure of the skeleton oil seal and oil leakage between the shell and the rotating shaft. After the oil leakage occurs at the input and output shaft sealing of the uncoiler machine reduction gearbox, the equipment operation will have a large hidden danger, which may cause small downtime of the reduction gearbox due to the alarm of the thin oil lubrication pump, or even cause the uncoiler reduction gearbox bearing damage and gear tooth damage due to poor lubrication. CONTENT OF THE UTILITY MODEL
[0004] The application aims to at least solve the technical problem of poor sealing effect between the shell and the rotating shaft of the reduction gearbox in the related art. To this end, the application provides a sealing assembly and a reduction gearbox.
[0005] In a first aspect, the application provides a sealing assembly for sealing the gap between a shell and a rotating shaft, the rotating shaft penetrating the shell, and the sealing assembly comprising:
[0006] an outer ring comprising an outer ring skeleton and an outer ring sealing lip arranged on the outer ring skeleton, the outer ring skeleton being used for fixed and sealing connection with the rotating shaft;
[0007] an inner ring comprising an inner ring skeleton and an inner ring sealing lip arranged on the inner ring skeleton, the inner ring skeleton being sleeved outside the outer ring skeleton and being connected with the outer ring skeleton in rotation around the axis of the outer ring, the inner ring sealing lip being gap-fitted with the outer ring skeleton, and the outer ring sealing lip being gap-fitted with the inner ring skeleton;
[0008] a connecting piece used for gap-fitting with the rotating shaft and for fixed and sealing connection with the sealing shell, the connecting piece, the inner ring and the outer ring forming a return oil cavity for storing lubricating oil.
[0009] In some embodiments, the outer ring frame comprises a movable ring and a limiting member, the limiting member is sleeved on the movable ring and fixedly connected with the movable ring, and an annular limiting groove is formed by the movable ring and the limiting member, the outer ring sealing lip is arranged on the movable ring, the inner ring frame has a limiting part, and the limiting part is located in the limiting groove to be rotationally connected with the outer ring frame around the axis of the outer ring.
[0010] In some embodiments, the sealing assembly further comprises a sealing ring mounted on the inner side wall of the outer ring frame and extending out of the inner side wall of the outer ring frame for sealing the gap between the outer ring frame 111 and the rotating shaft.
[0011] In some embodiments, the sealing assembly further comprises a first sealing gasket arranged between the inner ring frame and the connecting piece for sealing the gap between the inner ring frame and the connecting piece.
[0012] In some embodiments, the connecting piece frame is provided with an oil return port communicated with the oil return cavity and an oil cap mounted on the connecting piece for sealing the oil return port.
[0013] In some embodiments, the outer ring sealing lip and the inner ring sealing lip are arranged in a staggered manner along the radial direction of the outer ring.
[0014] In some embodiments, the movable ring and the limiting member are fixedly connected by bolts, and the inner ring and the connecting piece are fixedly connected by bolts.
[0015] In the second aspect, the embodiments of the present application provide a reduction gearbox, which comprises the housing, the rotating shaft and the sealing assembly of the first aspect, the outer ring frame of the sealing assembly is sleeved on the rotating shaft and fixedly and sealingly connected with the rotating shaft, the connecting piece of the sealing assembly is fixedly and sealingly connected with the housing and gap-fitted with the rotating shaft.
[0016] In some embodiments, the sealing assembly further comprises a second sealing gasket arranged between the connecting piece and the reduction gearbox housing to seal the gap between the connecting piece and the reduction gearbox housing.
[0017] In some embodiments, the connecting piece has a positioning part, and the housing is provided with a positioning groove, and the positioning part is located in the positioning groove.
[0018] The utility model at least has following beneficial effects:
[0019] Compared with directly adopting the skeleton oil seal to seal the rotating shaft and the shell, the sealing assembly realizes two labyrinth seals through the inner ring sealing lip and the outer ring sealing lip, the sealing effect of the sealing assembly is better, and through the design of the oil return port, the oil flowing into the oil return cavity can flow back to the shell through the oil return port, so that the oil is prevented from leaking to the outside of the shell, and the sealing effect of the rotating shaft and the shell is ensured. BRIEF DESCRIPTION OF DRAWINGS
[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0021] Figure 1 The structure schematic diagram of the reduction gearbox in one or more embodiments of the present application is shown.
[0022] Figure 2 The structure schematic diagram of the reduction gearbox in one or more embodiments of the present application is shown. Figure 1 The sectional view along the direction A-A in the figure is shown.
[0023] Figure 3 The enlarged view at B in the figure is shown. Figure 2 The enlarged view at B in the figure is shown.
[0024] Fig. 100-sealing assembly, 100a-oil return cavity, 110-outer ring, 110a-limiting groove, 111-outer ring skeleton, 1111-moving ring, 1112-limiting piece, 112-outer ring sealing lip, 120-inner ring, 121-inner ring skeleton, 1211-limiting part, 122-inner ring sealing lip, 130-connection piece, 130a-oil return port, 131-positioning part, 140-sealing ring, 150-first sealing gasket, 160-second sealing gasket, 1000-reduction gearbox, 200-shell, 200a-positioning groove, 300-rotating shaft. DETAILED DESCRIPTION
[0025] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0026] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.
[0027] In the utility model, unless another definite provision and limitation, the terms "connect", "fix" and the like should be understood broadly, for example, "fix" can be fixed connection, also can be detachable connection, or be integrated, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirect connection through intermediate medium, can be the intercommunication of two elements or the interaction of two elements, unless another definite limitation. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.
[0028] In addition, in the utility model, the description such as "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but must be based on the realization of ordinary skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.
[0029] The uncoiler taker is one of the important equipment in the production line, and its reliability is related to the stable operation of the whole unit. Whether the oil leakage occurs at the sealing position between the shell and the rotating shaft of the uncoiler taker reducer box is an important control key point of the uncoiler taker, and is one of the key points of daily inspection and maintenance.
[0030] In the related art, the gap between the shell and the rotating shaft is sealed by a skeleton oil seal, the skeleton oil seal is arranged on the rotating shaft and in sealing contact with the rotating shaft, and the skeleton oil seal is fixed on the shell and in sealing connection with the shell. Due to the limitation of the structure of the skeleton oil seal, long-time operation of the uncoiler taker can cause wear at the contact position between the skeleton oil seal and the rotating shaft, resulting in sealing failure of the skeleton oil seal, and oil leakage between the shell and the rotating shaft. After the oil leakage occurs at the input and output shaft sealing of the uncoiler taker reducer box, the equipment operation will have a large equipment hidden danger, which may cause small downtime of the reducer oil level reduction and alarm of the thin oil lubrication pump, or serious accidents such as damage of the uncoiler taker reducer box bearing and gear tooth due to poor lubrication.
[0031] In the related art, there is a technical problem of poor sealing effect between the shell and the rotating shaft of the reducer box. The sealing assembly and the reducer provided in the embodiments of the present application can at least solve the technical problem of poor sealing effect between the shell and the rotating shaft of the reducer to some extent.
[0032] The present application will be described below in conjunction with the drawings and with reference to specific embodiments:
[0033] The sealing assembly 100 is used to seal the gap between the housing 200 and the rotating shaft 300 which penetrates the housing 200. The sealing assembly 100 comprises an outer ring 110, an inner ring 120 and a connecting piece 130.
[0034] The outer ring 110 comprises an outer ring skeleton 111 and an outer ring sealing lip 112 arranged on the outer ring skeleton 111, and the outer ring skeleton 111 is used to be fixedly and sealingly connected with the rotating shaft 300.
[0035] The inner ring 120 comprises an inner ring skeleton 121 and an inner ring sealing lip 122 arranged on the inner ring skeleton 121, and the inner ring skeleton 121 is sleeved on the outer ring skeleton 111 and is rotationally connected with the outer ring skeleton 111 around the axis of the outer ring 110, and the inner ring sealing lip 122 is in clearance fit with the outer ring skeleton 111, and the outer ring sealing lip 112 is in clearance fit with the inner ring skeleton 121.
[0036] The connecting piece 130 is used to be in clearance fit with the rotating shaft 300 and is used to be fixedly and sealingly connected with the sealing housing 200, and the connecting piece 130, the inner ring 120 and the outer ring 110 jointly enclose an oil return cavity 100a for storing lubricating oil, and the connecting piece 130 is provided with an oil return port 130a which is communicated with the oil return cavity 100a.
[0037] It should be noted that the housing 200 is provided with a through hole (not shown in the figure) which is communicated with the oil return port 130a, and the oil in the oil return cavity 100a flows into the through hole through the oil return port 130a and returns to the housing 200 through the through hole.
[0038] The outer ring skeleton 111 supports and fixes the outer ring sealing lip 112 thereon, and the outer ring sealing lip 112 is fixedly and sealingly connected with the outer ring skeleton 111. The outer ring sealing lip 112 can be bonded on the outer ring skeleton 111, the outer ring skeleton 111 can be made of metal materials such as steel and iron, and the outer ring sealing lip 112 can be made of materials with elasticity such as nitrile rubber, polyurethane rubber, silicone rubber or polytetrafluoroethylene.
[0039] The inner ring skeleton 121 supports and fixes the inner ring sealing lip 122 thereon, and the inner ring sealing lip 122 is fixedly and sealingly connected with the inner ring skeleton 121. The inner ring sealing lip 122 can be bonded on the inner ring skeleton 121, the inner ring skeleton 121 can be made of metal materials such as steel and iron, and the inner ring sealing lip 122 can be made of materials with elasticity such as nitrile rubber, polyurethane rubber, silicone rubber or polytetrafluoroethylene.
[0040] The outer ring sealing lip 112 is in clearance fit with the inner ring skeleton 121 to form a labyrinth seal. It is easily understood that the outer ring sealing lip 112 has a plurality of sealing teeth in clearance fit with the inner ring skeleton 121. The inner ring sealing lip 122 is in clearance fit with the outer ring skeleton 111 to form a labyrinth seal. It is easily understood that the inner ring sealing lip 122 also has a plurality of sealing teeth in clearance fit with the outer ring skeleton 111.
[0041] In some embodiments, Figure 3 As shown in FIG. 1, the outer ring sealing lip 112 has two sealing teeth and the inner ring sealing lip 122 has three sealing teeth. The shape of the sealing teeth is various and known to those skilled in the art, which will not be described here.
[0042] In use of the sealing assembly 100, the outer ring skeleton 111 is sleeved on the rotating shaft 300 and fixedly and sealingly connected with the rotating shaft 300, so that the outer ring 110 rotates synchronously with the rotating shaft 300.
[0043] The inner ring sealing lip 122 is in clearance fit with the outer ring skeleton 111 and the outer ring sealing lip 112 is in clearance fit with the inner ring skeleton 121 to form a labyrinth seal when the rotating shaft 300 rotates. Both the outer ring sealing lip 112 and the inner ring sealing lip 122 seal the clearance between the outer ring skeleton 111 and the inner ring skeleton 121, so that the lubricating oil in the housing 200 cannot leak through the clearance between the outer ring skeleton 111 and the inner ring skeleton 121.
[0044] In use of the sealing assembly 100, the connecting piece 130 is fixedly and sealingly connected with the housing 200, so that the connecting piece 130 and the inner ring skeleton 121 are fixed and do not rotate with the rotating shaft 300. The inner ring skeleton 121 is sealingly connected with the connecting piece 130 to prevent the lubricating oil in the oil return cavity 100a from leaking through the clearance between the inner ring skeleton 121 and the connecting piece 130.
[0045] The outer ring skeleton 111 of the sealing assembly 100 is used to be sleeved on the rotating shaft 300 and fixedly and sealingly connected with the rotating shaft 300, so that the outer ring 110 can rotate with the rotating shaft 300 and the lubricating oil in the housing 200 for lubricating the gear and the rotating shaft 300 cannot leak through the clearance between the outer ring skeleton 111 and the rotating shaft 300. The connecting piece 130 is used to be fixedly and sealingly connected with the housing 200, so that the inner ring 120 and the connecting piece 130 do not rotate with the rotating shaft 300 and the lubricating oil in the housing 200 for lubricating the gear and the rotating shaft 300 cannot leak through the clearance between the connecting piece 130 and the housing 200.
[0046] The inner ring sealing lip 122 and the outer ring skeleton 111 are in clearance fit, and the outer ring sealing lip 112 and the inner ring skeleton 121 are in clearance fit, thereby forming two labyrinth seals, and the sealing effect of the sealing assembly 100 is better. Through the design of the oil return port 130a, the oil flowing into the oil return cavity 100a can flow back to the shell 200 through the oil return port 130a, preventing the oil from leaking out of the shell 200, and ensuring the sealing effect between the rotating shaft 300 and the shell 200.
[0047] In some embodiments, the outer ring skeleton 111 includes a movable ring 1111 and a limiting piece 1112, the limiting piece 1112 is sleeved on the movable ring 1111 and fixedly connected with the movable ring 1111, and an annular limiting groove 110a is formed by the movable ring 1111 and the limiting piece 1112, and the outer ring sealing lip 112 is arranged on the movable ring 1111, and the inner ring skeleton 121 has a limiting part 1211, which is located in the limiting groove 110a and connected with the outer ring skeleton 111 around the axis of the outer ring 110.
[0048] In the installation, the inner ring skeleton 121 is sleeved on the movable ring 1111, and then the limiting piece 1112 is sleeved on the movable ring 1111 and fixedly connected with the limiting piece 1112 and the movable ring 1111. After the limiting piece 1112 is fixedly connected with the movable ring 1111, the limiting part 1211 of the inner ring skeleton 121 is limited in the limiting groove 110a, and the inner ring skeleton 121 is installed on the inner ring 120. Since the limiting groove is annular, the limiting part 1211 of the inner ring skeleton 121 can rotate in the limiting groove 110a around the rotating shaft 300 of the outer ring 110. This design not only realizes the rotational connection of the outer ring skeleton 111 around the axis of the outer ring 110, but also limits the limiting part 1211 from coming out of the limiting groove 110a along the axis direction of the outer ring 110, so that the outer ring 110 and the inner ring 120 are limited, which helps to ensure the accuracy of the position of the outer ring 110 and the inner ring 120, and ensures that the outer ring sealing lip 112 is always in clearance fit with the inner ring skeleton 121, and the inner ring sealing lip 122 is always in clearance fit with the outer ring skeleton 111. After such design, a labyrinth seal structure is formed between the limiting groove 110a and the limiting part 1211 of the inner ring skeleton 121, which helps to ensure the sealing performance between the outer ring 110 and the inner ring 120. It should be noted that the shape of the limiting groove 110a and the limiting part 1211 is not limited in this application, and users can design it as needed. In some embodiments, the cross section of the limiting part 1211 is L-shaped, as shown in Figure 3
[0049] In some embodiments, the sealing assembly 100 further includes a sealing ring 140, which is installed on the inner side wall of the outer ring skeleton 111 and protrudes from the inner side wall of the outer ring skeleton 111, and is used to seal the gap between the outer ring skeleton 111 and the rotating shaft 300.
[0050] The sealing ring 140 is fixedly disposed on the inner sidewall of the outer ring frame 111 and extends out of the inner sidewall of the outer ring frame 111 so that the sealing ring 140 can contact the rotating shaft 300. When using the sealing assembly 100, the sealing ring 140 is sleeved on the outside of the rotating shaft 300, and the rotating shaft 300 and the outer ring frame 111 clamp the sealing ring 140 between them. Through the design of the sealing ring 140, the outer ring frame 111 and the rotating shaft 300 are sealed together.
[0051] In some embodiments, the sealing assembly 100 further includes a first sealing gasket 150 disposed between the inner ring skeleton 121 and the connector 130 for sealing the gap between the inner ring skeleton 121 and the connector 130.
[0052] The first sealing gasket 150 is located between the inner ring skeleton 121 and the connector 130. After the inner ring skeleton 121 and the connector 130 are fixedly connected, the first sealing gasket 150 is clamped. The first sealing gasket 150 fills the gap between the inner ring skeleton 121 and the connector 130 so that the inner ring skeleton 121 and the connector 130 are sealed together.
[0053] In some embodiments, the outer ring sealing lip 112 and the inner ring sealing lip 122 are misaligned along the radial direction of the outer ring 110.
[0054] In other words, such as Figure 3 As shown, along the axial direction of the outer ring 110, the outer ring sealing lip 112 and the inner ring sealing lip 122 are arranged side by side, but the outer ring sealing lip 112 and the inner ring sealing lip 122 are located on different circumferences. This design helps to make the gap between the outer ring skeleton 111 and the inner ring skeleton 121 tortuous and complex, forming a labyrinth-like sealing structure, which helps to ensure the sealing performance between the outer ring 110 and the inner ring 120.
[0055] In some embodiments, the moving ring 1111 and the limiting member 1112 are fixedly connected by bolts, and the inner ring 120 and the connecting member 130 are fixedly connected by bolts.
[0056] In some embodiments, the connector 130 is fixedly connected to the housing 200 by bolts.
[0057] In some embodiments, the outer ring 110, inner ring 120, and connector 130 are formed by multiple connected pieces to facilitate the mounting of the sealing assembly 100 on the rotating shaft 300. In some embodiments, the outer ring 110, inner ring 120, and connector 130 are formed by two semi-circular structural bolts.
[0058] Based on the same inventive concept, the application further provides a speed reducer 1000, comprising a housing 200, a rotating shaft 300 penetrating the housing 200, and the sealing assembly 100 described above, the outer ring frame 111 of the sealing assembly 100 is sleeved on the rotating shaft 300 and fixedly and sealingly connected with the rotating shaft 300, the connecting piece 130 of the sealing assembly 100 is fixedly and sealingly connected with the housing 200, and is in clearance fit with the rotating shaft 300.
[0059] It should be noted that when the sealing assembly 100 is installed, the sealing assembly 100 is located outside the housing 200. The speed reducer 1000 can further comprise gears and other components, and the rotating shaft 300 can be an output shaft or an output shaft of the speed reducer 1000, which is not limited in the application. The structure of the housing 200 and the rotating shaft 300 of the speed reducer 1000 is various, which is not limited in the application. Since the speed reducer 1000 has the sealing assembly 100 of the application, it naturally has all the beneficial effects of the sealing assembly 100 of the application, which will not be repeated here.
[0060] In some embodiments, the sealing assembly 100 further comprises a second sealing gasket 160, which is arranged between the connecting piece 130 and the housing 200 of the speed reducer 1000, and sealingly connects the gap between the connecting piece 130 and the housing 200 of the speed reducer 1000. So that the connecting piece 130 is sealingly connected with the sealing housing 200.
[0061] In some embodiments, the connecting piece 130 has a positioning portion 131, and the housing 200 is provided with a positioning groove 200a, and the positioning portion 131 is located in the positioning groove 200a. After such design, during the installation of the connecting piece 130 to the housing 200, the connecting piece 130 and the housing 200 can be quickly aligned by inserting the positioning portion 131 into the positioning groove 200a, which can facilitate the installation of the connecting piece 130 on the housing 200.
[0062] The installation process of the sealing assembly 100 is as follows:
[0063] First, the second sealing gasket 160 is sleeved on the positioning portion 131 of the connecting piece 130;
[0064] Then, the connecting piece 130 is sleeved on the rotating shaft 300, and the positioning portion 131 of the connecting piece 130 is inserted into the positioning groove 200a of the housing 200;
[0065] Then, the connecting piece 130 and the housing 200 are fixed by using bolts, and the second sealing gasket 160 is compressed and sealingly connected between the connecting piece 130 and the housing 200 under the action of the bolts;
[0066] Then, the first sealing gasket 150 is sleeved on the inner ring 120;
[0067] Next, the inner ring 120 is sleeved on the rotating shaft 300, and the inner ring frame 121 and the connecting piece 130 are fixedly connected by using bolts, and the first sealing gasket 150 is compressed and sealed under the action of the bolts to seal the gap between the inner ring frame 121 and the connecting piece 130;
[0068] Next, glue is applied to the inner wall of the inner ring 120, and the sealing ring is sleeved in the inner ring 120;
[0069] Next, the inner ring 120 is sleeved on the rotating shaft 300;
[0070] Next, the limiting piece 1112 is sleeved on the outer ring 110, and then the limiting piece 1112 and the outer ring frame 111 are fixedly connected by using bolts.
[0071] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present specification.
[0072] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the scope of protection required by the present application.
[0073] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.
Claims
1. A seal assembly characterized by, A sealing assembly (100) for sealing a gap between a housing (200) and a rotating shaft (300) penetrating through the housing (200), the sealing assembly (100) comprising: an outer ring (110) including an outer ring skeleton (111) and an outer ring sealing lip (112) arranged on the outer ring skeleton (111), the outer ring skeleton (111) being used for fixed and sealed connection with the rotating shaft (300); an inner ring (120) including an inner ring skeleton (121) and an inner ring sealing lip (122) arranged on the inner ring skeleton (121), the inner ring skeleton (121) being sleeved on the outer ring skeleton (111) and being rotatably connected with the outer ring skeleton (111) around an axis of the outer ring (110), the inner ring sealing lip (122) being in clearance fit with the outer ring skeleton (111), and the outer ring sealing lip (112) being in clearance fit with the inner ring skeleton (121); a connecting piece (130) used for clearance fit with the rotating shaft (300) and fixed and sealed connection with the sealing housing (200), the connecting piece (130), the inner ring (120) and the outer ring (110) forming a return oil cavity (100a) for storing lubricating oil, and the connecting piece (130) being provided with a return oil port (130a) communicating with the return oil cavity (100a).
2. The seal assembly of claim 1, wherein, The outer ring skeleton (111) includes a movable ring (1111) and a limiting piece (1112), the limiting piece (1112) being sleeved on the movable ring (1111) and being fixedly connected with the movable ring (1111), and forming an annular limiting groove (110a) with the movable ring (1111), the outer ring sealing lip (112) being arranged on the movable ring (1111), and the inner ring skeleton (121) having a limiting portion (1211) located in the limiting groove (110a) to be rotatably connected with the outer ring skeleton (111) around the axis of the outer ring (110).
3. The seal assembly of claim 1 or 2, wherein, The sealing assembly (100) further comprises a sealing ring (140) mounted on and extending from an inner side wall of the outer ring skeleton (111) to seal a gap between the outer ring skeleton (111) and the rotating shaft (300).
4. The seal assembly of claim 1 or 2, wherein, The sealing assembly (100) further comprises a first sealing gasket (150) arranged between the inner ring skeleton (121) and the connecting piece (130) to seal a gap between the inner ring skeleton (121) and the connecting piece (130).
5. The seal assembly of claim 1 or 2, wherein, The outer ring (110), the inner ring (120) and the connecting piece (130) are formed by multiple connections.
6. The seal assembly of claim 1 or 2, wherein, The outer ring sealing lip (112) and the inner ring sealing lip (122) are arranged in a staggered manner along a radial direction of the outer ring (110).
7. The seal assembly of claim 1 or 2, wherein, The movable ring (1111) and the limiting piece (1112) are fixedly connected by bolts, and the inner ring (120) and the connecting piece (130) are fixedly connected by bolts.
8. A reduction gearbox (1000) characterized by, The sealing assembly (100) is sleeved on the rotating shaft (300) and fixedly and sealingly connected with the rotating shaft (300), the connecting piece (130) of the sealing assembly (100) is fixedly and sealingly connected with the shell (200) and gap-fitted with the rotating shaft (300).
9. The reduction gearbox of claim 8, wherein, The sealing assembly (100) further comprises a second sealing gasket (160) arranged between the connecting piece (130) and the shell (200) of the reduction gearbox (1000) to seal the gap between the connecting piece (130) and the shell (200) of the reduction gearbox (1000).
10. The reduction gearbox of claim 8, wherein, The connecting piece (130) has a positioning portion (131), and the shell (200) is provided with a positioning groove (200a), and the positioning portion (131) is located in the positioning groove (200a).