Deepwater oil seal with dustproof lip

Abstract

The utility model discloses a deepwater oil seal with a dustproof lip, which comprises an integrally formed oil seal main body, a containing hole is arranged on the oil seal main body in a penetrating way, the oil seal main body comprises an outer ring and an inner ring, and the inner ring is arranged in the outer ring and is used for a rotating shaft to penetrate through; the inner ring comprises a main lip for tightly holding the periphery of the rotating shaft to form a seal and a dustproof lip for blocking external foreign matters; a liquid containing groove used for containing media is formed between the oil seal body and the main lip. And when the pressure intensity of the medium in the liquid containing groove is increased, the main lip is extruded to deform and further hold the rotating shaft tightly. According to the utility model, the inner ring for tightly holding the rotating shaft is designed into a double dustproof structure with the main lip and the dustproof lip, so that most dust can be blocked outside, the sealing performance and the dustproof capability are effectively enhanced, and the sealing ring is suitable for various sealing devices. In addition, the oil seal is made of PTFE materials through integral injection molding, the lubrication condition is better, the abrasion resistance is better, and the service life of the oil seal is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing elements, in particular to a deep water oil seal with a dustproof lip and a self-lubricating function. Background Art

[0002] Traditional oil seals are widely used in various industries, but due to certain characteristics of the material of ordinary oil seals, their use is also subject to some restrictions. Under certain specific working conditions, it is difficult for ordinary oil seals to achieve very good results.

[0003] For example, when equipment equipped with oil seals is running in an environment with a lot of dust in the air, if the dust cannot be effectively prevented from entering the interior of the equipment, it is easy to cause dust to enter the equipment, and the dust will accelerate the wear of the internal parts of the entire equipment, including shafts, holes, seals and other structural parts, which are very easy to damage. In addition, factors such as poor lubrication of the oil seal, dripping water in the working environment, and high-speed operation of the equipment will cause the service life of the oil seal to fall short of expectations. At this time, the dust-proof function of the oil seal is particularly important.

[0004] However, most oil seals on the market are generally made of TC material, and usually have a relatively simple structure. For example, the invention patent application with patent publication number CN207814418U discloses an acid-alkali resistant TC skeleton oil seal, which includes: a body, the upper and lower surfaces of the body are circular end faces of the same size, the side wall of the body is a circumferential arc surface structure, a No. 1 sealing tube body is arranged at the center of the upper and lower surfaces of the body, and the No. 1 sealing tube body is connected to the hollow structure inside the body; the No. 1 sealing tube body and the circular end face of the body are transitioned through an arc surface; an annular raised rib is arranged at the other end of the No. 1 sealing tube body relative to the body; an arc-shaped protrusion is arranged at the middle part of the No. 1 sealing tube body, and the cavity inside the No. 1 sealing tube body at the arc-shaped protrusion also protrudes outward in the same shape. The acid-alkali resistant TC skeleton oil seal has a simple structure and is easy to assemble.

[0005] However, this existing acid and alkali resistant TC skeleton oil seal has the following shortcomings due to its own structural characteristics:

[0006] The main body, No. 1 sealing tube body and No. 2 sealing tube body in this technical solution are all made of rubber in one piece, and there is no design to block dust. When such a structure is operated in an environment with a lot of dust, it is difficult to block fine dust particles, which can easily lead to dust entering the equipment. The dust will accelerate the wear of the internal parts of the entire equipment, including the shaft, holes, seals and other structural parts, which are very easy to damage, affecting the normal use of the oil seal. In addition, the main body made of rubber material is usually not in good lubrication condition, and the rubber is very easy to wear excessively when the equipment is running at high speed, resulting in the oil seal service life not meeting expectations.

[0007] In view of this, the inventor proposes the following technical solution. Utility Model Content

[0008] The utility model aims to overcome the deficiencies of the prior art and provide a deep water oil seal with a dustproof lip.

[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions: a deep water oil seal with a dustproof lip, comprising: an integrally formed oil seal body, a receiving hole is penetrated through the oil seal body, the oil seal body comprises an outer ring and an inner ring arranged in the outer ring for the shaft to pass through, the inner ring comprises a main lip for hugging the shaft to form a seal and a dustproof lip for blocking external foreign matter; a liquid containing groove for containing a medium is formed between the oil seal body and the main lip.

[0010] Furthermore, in the above technical solution, the receiving hole is formed with a first opening for matching and installing with an external machine hole, and the dust lip protrudes outward from the oil seal body.

[0011] Furthermore, in the above technical solution, the receiving hole is respectively formed with a first opening and a second opening for matching with an external machine hole, and the dust lip is located in the receiving hole and does not protrude from the outer ring, and an avoidance groove is formed between the oil seal body and the dust lip.

[0012] Furthermore, in the above technical solution, a connecting portion thicker than the main lip and the dust lip is integrally formed between the outer ring and the inner ring.

[0013] Furthermore, in the above technical solution, the main lip includes a main lip waist portion connected to the connecting portion and a main lip opening for clamping the rotating shaft; the cross-sectional shape of the main lip is an eight-shaped shape or an inverted eight-shaped shape.

[0014] Furthermore, in the above technical solution, the dust lip includes a dust lip waist portion connected to the connecting portion and a dust lip opening which is tightly held on the rotating shaft and can block foreign matter; the cross-sectional shape of the dust lip is an eight-shaped or reverse eight-shaped shape.

[0015] Furthermore, in the above technical solution, the outer ring is formed with several protrusions around its periphery for engaging with external machine holes for limiting position.

[0016] Furthermore, in the above technical solution, the oil seal body is made of a filled and modified PTFE material and is integrally injection molded.

[0017] Furthermore, in the above technical solution, the oil seal body is respectively formed with a first chamfer and a second chamfer for assisting the assembly of the oil seal body with the external machine hole.

[0018] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art: In the utility model, by designing the inner ring for holding the rotating shaft into a double dustproof structure of a main lip and a dustproof lip, most of the dust can be blocked outside, and the sealing and dustproof capabilities are effectively enhanced under the premise of meeting the durability, and it is suitable for various sealing equipment. In addition, compared with the existing technical solution, the utility model adopts PTFE material for one-piece injection molding, which not only has better lubrication conditions, but also better wear resistance, and prolongs the service life of the oil seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of the utility model;

[0020] Figure 2 It is a cross-sectional view of the second embodiment of the present invention.

[0021] Figure 3 yes Figure 1 Enlarged view at A. DETAILED DESCRIPTION

[0022] The utility model is further described below in conjunction with specific embodiments and drawings.

[0023] See Figure 1 and Figure 3 As shown, a deep water oil seal with a dustproof lip is provided. In the first embodiment of the utility model, it comprises: an integrally formed oil seal body 1, a receiving hole 10 is provided through the oil seal body 1, the oil seal body 1 comprises an outer ring 2 and an inner ring 3 provided in the outer ring 2 for the shaft to pass through, the inner ring 3 comprises a main lip 31 for holding the shaft to form a seal and a dustproof lip 32 for blocking external foreign matter. In this embodiment, preferably, the inner diameter of the dustproof lip 32 is larger than the inner diameter of the main lip 31, that is, the interference between the dustproof lip 32 and the shaft is generally selected to be smaller than the interference between the main lip 31 and the shaft, so that the dustproof lip 32 can reduce the resistance to the shaft as much as possible while playing a dustproof role, and both the main lip 31 and the dustproof lip 32 have the ability to deform and can clamp the shaft to ensure the dustproof ability of the equipment during operation.

[0024] A liquid containing groove 4 for containing the medium is formed between the oil seal body 1 and the main lip 31. When the pressure of the medium in the liquid containing groove 4 increases, the main lip 31 is squeezed and deformed and further holds the shaft.

[0025] In this embodiment, the main lip 31 can adjust the degree of closeness to the rotating shaft according to the degree of its extrusion. Specifically, in actual use, when the medium pressure in the liquid tank 4 is relatively low, the main lip 31 is not squeezed to produce deformation or the deformation produced by the squeezing is relatively small. At this time, the main lip 3 and the rotating shaft are only pressed against the rotating shaft by the interference force. At this time, only the leakage of the medium with a relatively small pressure can be resisted. Although only the leakage of the medium with a relatively small pressure can be resisted, the corresponding friction between the rotating shaft and the main lip 31 is also small, and the shaft torque is small, which can achieve the purpose of energy saving. When the medium pressure in the liquid tank 4 is relatively high, the deformation caused by the squeezing of the main lip 31 increases. Correspondingly, at this time, in addition to the interference force between the main lip 31 and the rotating shaft, there is also a force generated by the high-pressure medium in the liquid tank 4 to push the main lip 31 toward the rotating shaft. At this time, the main lip 31 is in close contact with the rotating shaft and can resist the leakage of the medium with a relatively large pressure.

[0026] The housing hole 10 is formed with a first orifice 110 for matching with an external machine hole, and the dust lip 32 protrudes outward from the oil seal body 1. By designing the inner ring 3 for holding the shaft as a double dustproof structure of a main lip 31 and a dust lip 32, most of the dust can be blocked from the outside. Under the premise of meeting durability, the sealing and dustproof capabilities are effectively enhanced, and it is suitable for various sealing equipment.

[0027] A connecting portion 6 thicker than the main lip 31 and the dust lip 32 is integrally formed between the outer ring 2 and the inner ring 3. If the thickness of the main lip 31 is too thick, it may lose its flexibility and cause the lip to clamp the shaft too tightly. If the thickness of the main lip 31 is too thin, it may not be able to withstand high pressure and produce adaptive internal stress, which will result in the inability to clamp the shaft even if the interference is large. After multiple tests and adjustments, preferably, the ratio of the thickness of the main lip 31 to the thickness of the connecting portion 6 is 2:3. In addition, the dust lip 32 has the same thickness as the main lip 31. In addition, the thickness of the main lip 31 and the thickness of the dust lip 32 can be adjusted according to actual needs.

[0028] The main lip 31 includes a main lip waist 310 connected to the connecting portion 6 and a main lip 311 for holding the rotating shaft; the cross-sectional shape of the main lip 31 is an eight-shaped or reverse eight-shaped shape. The dustproof lip 32 includes a dustproof lip waist 320 connected to the connecting portion 6 and a dustproof lip 321 that holds the rotating shaft and can block foreign objects; the cross-sectional shape of the dustproof lip 32 is an eight-shaped or reverse eight-shaped shape. The length of the main lip waist 310 affects the angle of the main lip 311 at the contact point with the rotating shaft and the flexibility of the main lip 311. According to actual use needs, the lengths of the main lip waist 310 and the dustproof lip waist 320 can be adjusted, and usually the length of the main lip waist 310 is greater than the length of the dustproof lip waist 320.

[0029] In this embodiment, see Figure 3As shown, the oblique angle of the dustproof lip 32 is 30°-45°. On the one hand, the dustproof lip 32 can not only clamp the rotating shaft but also be deformable, ensuring the dustproof ability during operation; on the other hand, this angle range makes it difficult for the dustproof lip 321 to be flipped over by the rotating shaft during installation; the dustproof lip 321 is in a pointed shape, which reduces the contact area with the rotating shaft, and reduces the friction resistance between the rotating shaft while ensuring its dustproof performance. In addition, the main lip 311 is extended in the direction of the rotating shaft, and the main lip 311 is formed with a circle of abutment 313 inwardly, which reduces the contact area with the rotating shaft and increases the flexibility of the main lip 31 and the rotating shaft.

[0030] The outer ring 2 is formed with several protrusions 20 for engaging with the external machine hole. From the overall point of view, a dynamic seal of relative motion is formed between the inner ring 3 of the oil seal body 1 and the rotating shaft, and the outer ring 2 forms a static seal with the machine hole. The outer diameter of the oil seal body 1 is designed to have a certain interference with the inner wall of the machine hole, which can play a role of tight fit between each other, but due to the large contact area between such tight fit, it is not conducive to forming a very reliable static seal. Therefore, two protrusions 20 are added to the outer ring 2. When the oil seal body 1 is matched with the inner wall of the machine hole, these two protrusions are in particularly close contact with the inner wall surface, which can effectively form a static seal.

[0031] The oil seal body 1 is made of PTFE material and is integrally injection molded. In this embodiment, a filled and modified PTFE material is used. When modifying the PTFE material, wear-resistant materials are added on the one hand, and materials with self-lubricating properties are added on the other hand, so that the material not only greatly improves its wear resistance, but also has self-lubricating properties. After improving the wear resistance, the wear of the oil seal body 1 during use can be reduced, and its service life can be extended.

[0032] The oil seal body 1 is respectively formed with a first chamfer 101 and a second chamfer 102 for assisting the assembly of the oil seal body 1 with the external machine hole. The angles and lengths of the first chamfer 101 and the second chamfer 102 can be adjusted according to actual use needs. The outer ring 2 has a 20°-30° bevel at both ends, which is conducive to guiding the seal to enter the groove smoothly during the installation process, and plays a role in assisting the installation of the oil seal body 1.

[0033] In the second embodiment of the present utility model, see Figure 2As shown, the container hole 10 is respectively formed with a first orifice 110 and a second orifice 120 for matching with an external machine hole, and the dust lip 32 is located in the container hole 10 and does not protrude from the outer ring 2, and an avoidance groove 5 is formed between the oil seal body 1 and the dust lip 32. Among them, the dust lip 32 is located in the container hole 10 and does not protrude from the outer ring 2, so that the lower end of the outer ring 2 can well protect the dust lip 32 to avoid accidental damage to the dust lip 32 during production, transportation and assembly. Compared with the first embodiment, the second embodiment is different only in the dust lip 32 of the inner ring 3, and the other structures are the same, which will not be repeated here.

[0034] In summary, in the utility model, by designing the inner ring 3 for holding the rotating shaft into a double dustproof structure of a main lip 31 and a dustproof lip 32, most of the dust can be blocked outside, and the sealing and dustproof capabilities are effectively enhanced under the premise of meeting durability, and it is suitable for various sealing equipment. In addition, compared with the existing technology, the utility model adopts PTFE material for one-piece injection molding, which not only has better lubrication conditions, but also better wear resistance, and prolongs the service life of the oil seal.

[0035] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the structure, features and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A deep water oil seal with dust lip, include: An integrally formed oil seal body (1) is provided with a receiving hole (10) penetrating the oil seal body (1), and is characterized in that: The oil seal body (1) comprises an outer ring (2) and an inner ring (3) arranged inside the outer ring (2) for the shaft to pass through, the inner ring (3) comprising a main lip (31) for holding the shaft tightly to form a seal and a dustproof lip (32) for blocking external foreign matter; A liquid containing groove (4) for containing a medium is formed between the oil seal body (1) and the main lip (31).

2. A deep water oil seal with a dust lip according to claim 1, Features: The housing hole (10) is formed with a first orifice (110) for matching and mounting with an external machine hole, and the dust lip (32) protrudes outward from the oil seal body (1).

3. A deep water oil seal with a dust lip according to claim 1, Features: The receiving hole (10) is respectively formed with a first orifice (110) and a second orifice (120) for matching with an external machine hole, and the dust lip (32) is located in the receiving hole (10) and does not protrude from the outer ring (2), and an avoidance groove (5) is formed between the oil seal body (1) and the dust lip (32).

4. A deep water oil seal with a dust lip according to claim 1, Features: A connecting portion (6) that is thicker than the main lip (31) and the dustproof lip (32) is integrally formed between the outer ring (2) and the inner ring (3).

5. A deep water oil seal with dust lip according to claim 4, Features: The main lip (31) comprises a main lip waist (310) connected to the connecting portion (6) and a main lip opening (311) for clamping the rotating shaft; the cross-sectional shape of the main lip (31) is an eight-shaped shape or an inverse eight-shaped shape.

6. A deep water oil seal with dust lip according to claim 4, Features: The dustproof lip (32) comprises a dustproof lip waist (320) connected to the connecting portion (6) and a dustproof lip opening (321) which is tightly held on the rotating shaft and can block foreign matter; the cross-sectional shape of the dustproof lip (32) is an eight-shaped shape or an inverse eight-shaped shape.

7. A deep water oil seal with a dust lip according to any one of claims 1 to 6, Features: The outer ring (2) is formed with a plurality of protrusions (20) around its periphery for engaging with external machine holes for limiting position.

8. A deep water oil seal with a dust lip according to any one of claims 1 to 6, Features: The oil seal body (1) is made of PTFE material and is integrally injection-molded.

9. A deep water oil seal with a dust lip according to any one of claims 1 to 6, Features: The oil seal body (1) is respectively formed with a first chamfer (101) and a second chamfer (102) for assisting the assembly of the oil seal body (1) with an external machine hole.

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