Labyrinth muddy water prevention oil seal

Abstract

The utility model discloses a labyrinth type muddy water-proof oil seal, which belongs to the field of sealing elements, and comprises an upper oil seal and a lower oil seal, the upper oil seal and the lower oil seal are arranged on the outer surface of a rotating shaft, an outer sealing lip is contacted with the outer surface of the rotating shaft, and the outer sealing lip is extruded into an annular clamping groove. In the extrusion process, the outer sealing lip is elastically supported through the inner sealing spring, so that the convex face side of the outer sealing lip is tightly attached to the outer surface of the rotating shaft, the inner labyrinth groove and the annular inner sealing lip are arranged, a channel of the inner labyrinth groove is zigzag, muddy water must advance along the complex paths to block the muddy water, and the muddy water is prevented from entering the outer sealing lip. Each layer of annular inner sealing lip is tightly attached to the surface of the rotating shaft, muddy water can be blocked once, the sealing performance of the muddy water prevention oil seal is guaranteed, external muddy water and dust are effectively isolated, slurry is prevented from entering the surface of the rotating shaft, friction force of the rotating shaft in the using process is reduced, and the service life of the rotating shaft is prolonged. And the power transmission efficiency of the device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing elements, in particular to a labyrinth-type anti-mud and water oil seal. Background Art

[0002] Oil seal is the customary name for general seals. Simply put, it is a seal for lubricating oil. It is a mechanical component used to seal grease (oil is the most common liquid substance in the transmission system, and also refers to general liquid substances). It isolates the parts that need lubrication in the transmission components from the output components to prevent the lubricating oil from leaking. The seals used for static sealing and dynamic sealing (generally reciprocating motion) are called oil seals.

[0003] The existing anti-mud and water oil seal has certain defects in sealing performance during use. It only has a single sealing lip and cannot effectively isolate external mud, water and dust. When the oil seal body or oil seal frame is damaged, it needs to be replaced as a whole. It is difficult to quickly replace a damaged part, which increases the cost required to replace the device.

[0004] Therefore, the utility model provides a labyrinth-type anti-mud and water oil seal to solve the above problems. Utility Model Content

[0005] (1) Technical problems solved

[0006] The utility model provides a labyrinth type anti-mud and water oil seal, aiming to solve the existing problems raised in the background technology.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention provides the following technical solutions:

[0009] The cam is provided with a plurality of sealing springs, each of which has a plurality of inner labyrinth grooves, and an annular inner sealing lip is provided between each two of the inner labyrinth grooves. The annular inner sealing lip is fixedly mounted on the inner wall of the upper oil seal and the lower oil seal. The surfaces of the upper oil seal and the lower oil seal are connected with sealing sleeves. The inner wall of the sealing sleeve is provided with an annular groove. The inner wall of the annular groove is rotatably connected with a rotating retaining ring. An outer sealing lip is provided on one side of the rotating retaining ring. The shape of the outer sealing lip is set to be outwardly convex. A plurality of sealing springs are fixedly mounted on the inner side wall of the rotating retaining ring in an annular array. One end of the plurality of sealing springs is fixedly mounted on the outer surface of the outer sealing lip. The outer surfaces of the upper oil seal and the lower oil seal are provided with outer labyrinth grooves.

[0010] As a preferred technical solution of the present application, the outer sealing lip and the annular inner sealing lip are both made of rubber, the surfaces of the upper oil seal and the lower oil seal are both provided with mounting grooves, and the inner side walls of the mounting grooves are provided with a first internal thread groove.

[0011] As a preferred technical solution of the present application, the internal thread of the mounting groove is connected to an oil seal skeleton, and the outer surface of the oil seal skeleton is provided with a first external thread groove, which is adapted to the first internal thread groove.

[0012] As a preferred technical solution of the present application, sealing rings are fixedly installed on the mating surfaces of the upper oil seal and the lower oil seal, and sealing ring grooves are respectively opened on the mating surfaces of the upper oil seal and the lower oil seal. The number of the sealing rings and the sealing ring grooves is two respectively, and the size of the lower sealing ring is larger than that of the upper sealing ring.

[0013] As a preferred technical solution of the present application, the surfaces of the upper oil seal and the lower oil seal are both slidably overlapped with limit rings, and the side surfaces of the limit rings are fixedly installed with a number of limit columns, and the several limit columns are respectively slid through and connected to the surfaces of the upper oil seal and the lower oil seal. The surface of the oil seal skeleton is provided with a number of limit holes, and the limit holes are adapted to the limit columns.

[0014] As a preferred technical solution of the present application, a plurality of through holes are provided on the surfaces of the upper oil seal and the lower oil seal, the interior of the through holes is slidingly connected to a limiting column, a first sliding groove is provided inside the through hole, a limiting spring is fixedly installed inside the first sliding groove, and one end of the limiting spring is fixedly installed on the surface of the limiting column.

[0015] (3) Beneficial effects

[0016] 1. During use, the upper oil seal and the lower oil seal are installed on the outer surface of the rotating shaft. First, the outer sealing lip contacts the outer surface of the rotating shaft, and then the outer sealing lip is squeezed into the inside of the annular groove. During the squeezing process, the outer sealing lip is elastically supported by the internal sealing spring, so that the convex side of the outer sealing lip is in close contact with the outer surface of the rotating shaft. Then, the inner labyrinth groove and the annular inner sealing lip are arranged. The channel of the inner labyrinth groove is tortuous, and muddy water must advance along these complex paths to block the mud. Each layer of annular inner sealing lip is in close contact with the surface of the rotating shaft, which can block the muddy water once, ensuring the sealing performance of the anti-mud and water oil seal, effectively isolating external muddy water and dust, and preventing mud from entering the surface of the rotating shaft, thereby reducing the friction of the rotating shaft during use and improving the efficiency of the power transmission of the device;

[0017] 2. The first external thread groove provided on the outer surface of the oil seal skeleton is threadedly connected to the inner part of the upper oil seal and the lower oil seal, thereby completing the mutual connection between the upper and lower oil seals. Then, the limiting column is inserted into the limiting hole to limit the position of the oil seal skeleton, thereby ensuring the stability of the connection between the upper and lower oil seals. When a component is damaged, the damaged component can be disassembled and replaced, thereby reducing the cost required for replacement and improving the practicality of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of a labyrinth-type anti-mud and water oil seal;

[0019] Figure 2 This is a schematic structural diagram of an upper oil seal, a lower oil seal, and an oil seal frame of a labyrinth-type anti-mud and water oil seal;

[0020] Figure 3 This is a schematic diagram of the outer sealing lip and sealing spring structure of a labyrinth-type anti-mud and water oil seal;

[0021] Figure 4 It is a labyrinth type anti-mud and water oil seal Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0022] Figure 5 This is a schematic diagram of the limit ring and limit column structure of a labyrinth-type anti-mud and water oil seal.

[0023] In the picture:

[0024] 1. Upper oil seal; 2. Lower oil seal; 3. Inner labyrinth groove; 4. Annular inner sealing lip; 5. Sealing sleeve; 6. Annular groove; 7. Outer sealing lip; 8. Sealing spring; 9. Mounting groove; 10. Oil seal frame; 11. First external thread groove; 12. Sealing ring; 13. Sealing ring groove; 14. Limiting ring; 15. Limiting column; 16. Limiting hole; 17. Limiting spring; 18. Outer labyrinth groove. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] The utility model provides a labyrinth type anti-mud and water oil seal, comprising an upper oil seal 1 and a lower oil seal 2, wherein the inner side walls of the upper oil seal 1 and the lower oil seal 2 are provided with a plurality of inner labyrinth grooves 3, an annular inner sealing lip 4 is provided between every two inner labyrinth grooves 3, the annular inner sealing lip 4 is fixedly mounted on the inner side walls of the upper oil seal 1 and the lower oil seal 2, the surfaces of the upper oil seal 1 and the lower oil seal 2 are connected with a sealing sleeve 5, the inner side wall of the sealing sleeve 5 is provided with an annular groove 6, the inner side wall of the annular groove 6 is rotatably connected with a rotating snap ring, an outer sealing lip 7 is provided on one side of the rotating snap ring, the shape of the outer sealing lip 7 is set to be outwardly convex, a plurality of sealing springs 8 are fixedly mounted on the inner side wall annular array of the rotating snap ring, one end of the plurality of sealing springs 8 are fixedly mounted on the outer surface of the outer sealing lip 7, and the outer surfaces of the upper oil seal 1 and the lower oil seal 2 are provided with an outer labyrinth groove 18.

[0027] During the installation process, the annular inner sealing lip 4 is tightly attached to the outer surface of the rotating shaft, and the annular inner sealing lip 4 blocks the mud. Each layer of the annular inner sealing lip 4 is tightly attached to the surface of the rotating shaft, which can block the mud and water once. The setting of the inner labyrinth groove 3 requires that impurities such as mud and water need to pass through multiple tortuous channels to enter the interior of the equipment, which greatly increases the difficulty of their entry. Compared with ordinary anti-mud and water oil seals that only rely on a single sealing lip or a few sealing structures, the sealing effect is significantly improved. When the outer sealing lip 7 is installed on the outer surface of the rotating shaft, the outer sealing lip 7 is squeezed inward by the rotating shaft, and the inwardly contracted outer sealing lip 7 squeezes the internal sealing spring 8. The sealing spring 8 is squeezed and continuously supports the outer sealing lip 7, so that one side of the outer sealing lip 7 is tightly attached to the outer surface of the rotating shaft, thereby ensuring the stability of the seal.

[0028] The outer sealing lip 7 and the annular inner sealing lip 4 are both made of rubber. The surfaces of the upper oil seal 1 and the lower oil seal 2 are both provided with mounting grooves 9. The inner side wall of the mounting groove 9 is provided with a first internal thread groove. The internal thread of the mounting groove 9 is connected to the oil seal skeleton 10. The outer surface of the oil seal skeleton 10 is provided with a first external thread groove 11, which is adapted to the first internal thread groove.

[0029] When it is necessary to combine and connect the upper oil seal 1 and the lower oil seal 2, the upper oil seal 1 and the lower oil seal 2 are installed on the outer surface of the oil seal skeleton 10. The oil seal skeleton 10 allows the oil seal to maintain its shape during installation and use. The first external thread groove 11 on the outer surface of the oil seal skeleton 10 slides into the inside of the installation groove 9, and then the oil seal skeleton 10 is rotated to thread the oil seal skeleton 10 into the first internal thread groove on the inner side wall of the installation groove 9, thereby connecting the upper and lower oil seals 1 and the lower oil seal 2 on the upper and lower sides through the oil seal skeleton 10.

[0030] Sealing rings 12 are fixedly installed on the mating surfaces of the upper oil seal 1 and the lower oil seal 2, and sealing ring grooves 13 are respectively opened on the mating surfaces of the upper oil seal 1 and the lower oil seal 2. The number of sealing rings 12 and sealing ring grooves 13 are two respectively, and the size of the lower sealing ring 12 is larger than that of the upper sealing ring 12.

[0031] During the connection process, the sealing ring 12 of the upper oil seal 1 and the sealing ring 12 of the lower oil seal 2 approach each other. When the two sides of the sealing ring 12 of the upper oil seal 1 are in contact, the sealing ring 12 on the opposite side is respectively inserted into the sealing ring groove 13 on the opposite side, thereby ensuring the sealing performance of the connection between the upper oil seal 1 and the lower oil seal 2.

[0032] The surfaces of the upper oil seal 1 and the lower oil seal 2 are both slidably overlapped with a limit ring 14, and a number of limit columns 15 are fixedly installed on the side surface of the limit ring 14. The number of limit columns 15 slide through and are connected to the surfaces of the upper oil seal 1 and the lower oil seal 2 respectively. The surface of the oil seal skeleton 10 is provided with a number of limit holes 16, and the limit holes 16 are adapted to the limit columns 15. The surfaces of the upper oil seal 1 and the lower oil seal 2 are both provided with a number of through holes, and the interior of the through holes is slidably connected to the limit columns 15. A first slide groove is provided inside the through hole, and a limit spring 17 is fixedly installed inside the first sliding part, and one end of the limit spring 17 is fixedly installed on the surface of the limit column 15.

[0033] During the installation process, the staff pulls the limit ring 14 outward, thereby driving the limit column 15 on one side to slide outward and disengage from the inside of the installation groove 9, squeezing the internal limit spring 17 during the sliding process, and then threading the upper oil seal 1 or the lower oil seal 2 to the outer surface of the oil seal skeleton 10. When it is rotated to the bottom, the reset force of the limit spring 17 drives the limit ring 14 to reset and slide, and the limit ring 14 drives the limit column 15 to insert into the limit hole 16 on the surface of the oil seal skeleton 10, thereby preventing the oil seal skeleton 10 from rotating under the action of external force, thereby ensuring the stability of the connection between the upper oil seal 1 and the lower oil seal 2. When disassembly is required, on the contrary, the damaged parts are removed and replaced, and there is no need to replace the entire part, which reduces the replacement cost.

[0034] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A labyrinth-type anti-mud and water oil seal, comprising an upper oil seal (1) and a lower oil seal (2), characterized in that: The inner side walls of the upper oil seal (1) and the lower oil seal (2) are each provided with a plurality of inner labyrinth grooves (3), an annular inner sealing lip (4) is provided between each two of the inner labyrinth grooves (3), the annular inner sealing lip (4) is fixedly mounted on the inner side walls of the upper oil seal (1) and the lower oil seal (2), the surfaces of the upper oil seal (1) and the lower oil seal (2) are both connected with a sealing sleeve (5), the inner side walls of the sealing sleeve (5) are provided with an annular groove (6), the inner side walls of the annular groove (6) are rotatably connected with a rotating snap ring, an outer sealing lip (7) is provided on one side of the rotating snap ring, the shape of the outer sealing lip (7) is set to be outwardly convex, a plurality of sealing springs (8) are fixedly mounted in an annular array on the inner side wall of the rotating snap ring, one end of the plurality of sealing springs (8) are fixedly mounted on the outer surface of the outer sealing lip (7), and the outer surfaces of the upper oil seal (1) and the lower oil seal (2) are both provided with an outer labyrinth groove (18).

2. The labyrinth type anti-mud and water oil seal according to claim 1, characterized in that: The outer sealing lip (7) and the annular inner sealing lip (4) are both made of rubber. The surfaces of the upper oil seal (1) and the lower oil seal (2) are both provided with mounting grooves (9), and the inner side walls of the mounting grooves (9) are provided with first internal thread grooves.

3. The labyrinth type anti-mud and water oil seal according to claim 2, characterized in that: The internal thread of the installation groove (9) is connected to an oil seal skeleton (10), and the outer surface of the oil seal skeleton (10) is provided with a first external thread groove (11), and the first external thread groove (11) is adapted to the first internal thread groove.

4. The labyrinth type anti-mud and water oil seal according to claim 1, characterized in that: A sealing ring (12) is fixedly mounted on the mating surfaces of the upper oil seal (1) and the lower oil seal (2), and a sealing ring groove (13) is provided on the mating surfaces of the upper oil seal (1) and the lower oil seal (2). There are two sealing rings (12) and two sealing ring grooves (13), and the size of the lower sealing ring (12) is larger than that of the upper sealing ring (12).

5. The labyrinth type anti-mud and water oil seal according to claim 3, characterized in that: The surfaces of the upper oil seal (1) and the lower oil seal (2) are both slidably overlapped with a limiting ring (14), and the side surface of the limiting ring (14) is fixedly mounted with a plurality of limiting columns (15), and the plurality of limiting columns (15) are respectively slidably penetrated and connected to the surfaces of the upper oil seal (1) and the lower oil seal (2), and the surface of the oil seal frame (10) is provided with a plurality of limiting holes (16), and the limiting holes (16) are adapted to the limiting columns (15).

6. The labyrinth type anti-mud and water oil seal according to claim 1, characterized in that: The surfaces of the upper oil seal (1) and the lower oil seal (2) are both provided with a plurality of through holes, the interior of the through holes being slidably connected to a limiting column (15), the interior of the through holes being provided with a first sliding groove, the interior of the first sliding groove being fixedly installed with a limiting spring (17), and one end of the limiting spring (17) being fixedly installed on the surface of the limiting column (15).

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