Conductive oil seal and bearing

Abstract

The utility model discloses a conductive oil seal and a bearing, the conductive oil seal comprises an annular supporting part, an annular dustproof lip part and a sealing lip part, and the conductive oil seal is made of conductive silica gel materials and has good conductivity and sealing performance. The dustproof lip part is arranged towards the atmosphere side, external dust and moisture can be effectively prevented from entering the sealing cavity, and the sealing lip part effectively prevents leakage of the lubricating medium. And the lip end part of the sealing lip part is attached to the peripheral surface of the supporting sleeve, and the sealing effect is further enhanced through the design of a sealing convex ring and a sealing cavity. Under cooperation of the high-pressure gas channel, stable pressure in the high-pressure cavity can be maintained, and the sealing performance in the high-pressure environment is ensured. The conductive oil seal is suitable for precision equipment and can prevent static accumulation and avoid equipment failure caused by electrocorrosion. Meanwhile, the utility model provides a bearing matched with the conductive oil seal, the bearing comprises an outer ring and an inner ring, the sealing effect is ensured through interference fit, and the conductive oil seal is suitable for a sliding bearing and a roller bearing and has long service life and high stability.

Description

TECHNICAL FIELD

[0001] The utility model relates to mechanical seal technical field, concretely relates to a conductive oil seal and bearing. BACKGROUND

[0002] In the existing mechanical seal technology, the traditional oil seal often faces the problems of poor sealing performance, short service life and easy failure in high pressure environment. Especially in the bearing sealing device, the oil seal not only needs to prevent the leakage of lubricating oil, but also needs to prevent the entry of external dust, moisture or other pollutants into the sealing cavity to avoid the influence on the bearing. At the same time, for the conductive oil seal, it also needs to ensure that it has good conductivity to prevent the accumulation of static electricity, which is particularly important for some precision equipment.

[0003] At present, the oil seal on the market adopts a single sealing mode, such as ordinary rubber oil seal or polyurethane oil seal. These structures will gradually appear problems such as leakage and wear during long-term use. In addition, although the torque of the magnetic oil seal can meet the requirements, it is expensive and complex to install, and the failure rate is high.

[0004] Therefore, a new type of conductive oil seal is designed, which has high performance, low cost and convenient installation as the target for future research and development of bearings to meet the industrial demand. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a conductive oil seal and bearing, which can maintain good sealing performance in high pressure environment, effectively prevent the entry of external dust, moisture or pollutants into the sealing cavity, have conductivity, prevent static electricity accumulation, and is particularly suitable for precision equipment requiring static protection and high pressure sealing.

[0006] The utility model solves the above problems by adopting the technical scheme of a conductive oil seal and bearing, which comprises an annular support part, the support part is provided with an annular dustproof lip part towards the atmosphere side, the dustproof lip part is provided with an annular sealing lip part with an inward circular arc transition towards the sealing medium side, a support sleeve is arranged in the sealing lip part, the outer circumferential surface of the support sleeve is attached to the lip end part of the sealing lip part, and the end part of the support sleeve towards the atmosphere side is attached to the dustproof lip part.

[0007] Preferably, a plurality of groups of annular grooves are coaxially and equidistantly arranged on the dustproof lip part towards the atmosphere side, and the distance and width of the annular grooves are the same.

[0008] Preferably, an annular sealing groove is arranged on the outer circumferential surface of the support part, and a sealing rubber ring is arranged in the sealing groove.

[0009] Preferably, a plurality of groups of sealing convex rings are arranged at the attachment position of the lip end part of the sealing lip part and the outer circumferential surface of the support sleeve, and a sealing cavity is formed between adjacent sealing convex rings.

[0010] Preferably, the sealing convex ring is provided with three groups, forming two sealing cavities, including a high-pressure cavity close to the sealing medium side and an atmospheric pressure cavity close to the atmospheric side, the depth of the high-pressure cavity is greater than that of the low-pressure cavity, and the support portion is provided with a high-pressure gas channel communicated with the high-pressure cavity, and the gas inlet of the high-pressure gas channel is arranged on the support portion.

[0011] A bearing matched with the conductive oil seal, characterized in that comprising an outer ring and an inner ring, one end of the outer ring is provided with an annular sealing portion, the outer circumferential surface of the sealing portion is in interference fit with the inner circumferential surface of the support portion, the inner ring is coaxially arranged with the support sleeve and the end portions are in abutment, and the retainer is arranged between the outer ring and the inner ring.

[0012] Preferably, a plurality of rolling elements arranged in equal intervals in the circumferential direction are arranged between the outer ring and the inner ring.

[0013] Preferably, the rolling elements are matched with the retainer, and the retainer is arranged between the outer ring and the inner ring.

[0014] Compared with the prior art, the utility model has the following advantages and effects:

[0015] The utility model discloses a structure design of annular support portion, dustproof lip portion and sealing lip portion, can effectively prevent the leakage of lubricating medium, prevents the dust, moisture and other pollutants from outside from entering the sealing cavity simultaneously, thereby guaranteeing the long-term stability and reliability of the sealing system. Through the close cooperation of the dustproof lip portion and the rotating shaft and the setting of the annular groove, not only can effectively prevent the external pollutants from entering the oil seal inside, but also can make the dustproof lip portion bend to the sealing medium side through the contact with the baffle, further increase the contact area and improve the sealing effect. The setting of the sealing convex ring, the design of the sealing cavity and the configuration of the high-pressure gas channel make the utility model can work stably for a long time under high pressure environment, prevent high-pressure medium from leaking, and further enhance the sealing effect through the pressure difference. The design of the high-pressure gas channel not only enhances the sealing performance, but also carries away the heat generated by the bearing rotation through the airflow, which helps to dissipate heat, prevents the bearing from overheating and prolongs the service life of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structure schematic diagram of the conductive oil seal of the utility model embodiment.

[0017] Figure 2 It is the assembly structure schematic diagram of the bearing of the utility model embodiment.

[0018] Figure 3 It is the cooperation schematic diagram of the dustproof lip portion and the support sleeve of the utility model embodiment.

[0019] Figure 4 It is the structure schematic diagram of the lip end portion of the sealing lip portion of the utility model embodiment.

[0020] Figure No. Support part 11, dust lip part 12, sealing lip part 13, support sleeve 14, bearing seat 15, matching part 16, rotating shaft 17, lip end part 18, annular groove 19, retaining ring 20, sealing groove 21, sealing rubber ring 22, sealing convex ring 23, sealing cavity 24, high-pressure cavity 25, normal-pressure cavity 26, high-pressure gas passage 27, gas inlet 28, outer ring 31, inner ring 32, sealing part 33, rolling body 34, retainer 35. DETAILED DESCRIPTION

[0021] The utility model will be further explained in detail below by combining with the drawings and through examples, and the following examples are the explanation of the utility model and the utility model is not limited to the following examples.

[0022] Example 1:

[0023] Referring to Figure 1 - Figure 4 In this embodiment, a conductive oil seal and bearing are related, which are particularly used for end sealing of bearing seat 15 and other shaft connecting structures, and particularly include annular support part 11, annular dust lip part 12 is arranged on the atmosphere side of support part 11, annular sealing lip part 13 with inward circular arc transition is arranged on the sealing medium side of dust lip part 12, support sleeve 14 is arranged in sealing lip part 13, the outer circumferential surface of support sleeve 14 is attached to the lip end part 18 of sealing lip part 13, and the end on the atmosphere side of support sleeve 14 is attached to dust lip part 12, the annular support part 11, dust lip part 12 and sealing lip part 13 in this embodiment are all made of conductive silica gel, which plays a conductive role and can protect the bearing from failure caused by electric corrosion.

[0024] Specifically, in this embodiment, support part 11 is arranged in annular matching part 16, which is arranged in bearing seat 15 and close to the atmosphere side, and the outer circumferential surface of support part 11 is interference-fitted with the inner circumferential surface of matching part 16, and support sleeve 14 is sleeved on rotating shaft 17 and interference-fitted with rotating shaft 17. The inner circumferential surface of dust lip part 12 is attached to the outer circumferential surface of rotating shaft 17, which is used to prevent dust or moisture on the atmosphere side from invading the oil seal, so as to ensure that the lubricating medium in sealing cavity 24 will not be contaminated externally. The lip end part 18 of sealing lip part 13 is attached to the outer circumferential surface of support sleeve 14, which is used to prevent the lubricating medium on the sealing medium side from leaking, so as to maintain the long-term lubrication and sealing effect of the bearing.

[0025] On the basis of the design of the dust-proof lip 12, the dust-proof lip 12 in the embodiment is coaxially provided with a plurality of groups of annular grooves 19 at equal intervals on the atmospheric side, and the end of the support sleeve 14 is provided with a retaining ring 20. In use, the end of the dust-proof lip 12 is in contact with the retaining ring 20, so that the dust-proof lip 12 can be bent towards the sealing medium side, thereby increasing the contact area with the rotating shaft 17, improving the sealing effect, and effectively preventing dust or moisture from invading the oil seal from the atmospheric side. Since the spacing and width of the adjacent annular grooves 19 are the same, the mold is easy to manufacture, the production process is simplified, the processing efficiency is improved, and the production cost is effectively reduced.

[0026] In addition, the outer periphery of the support part 11 is provided with an annular sealing groove 21, and a sealing rubber ring 22 is arranged in the sealing groove 21. The sealing rubber ring 22 is embedded in the sealing groove 21, so that the cooperation between the outer periphery of the support part 11 and the cooperating part 16 of the bearing seat 15 is more closely, which can further increase the sealing performance, prevent the leakage of lubricating medium, and ensure the sealing performance of the oil seal.

[0027] The lip end 18 of the sealing lip 13 is provided with a plurality of groups of sealing convex rings 23 at the joint with the outer periphery of the support sleeve 14, and a sealing cavity 24 is formed between adjacent sealing convex rings 23. In the embodiment, the sealing convex ring 23 is provided with three groups, and the sealing cavity 24 formed has two, including a high-pressure cavity 25 close to the sealing medium side and an atmospheric cavity 26 close to the atmospheric side. The depth of the high-pressure cavity 25 is greater than the depth of the low-pressure cavity (in the embodiment, the depth of the high-pressure cavity 25 is twice the depth of the low-pressure cavity). The support part 11 is provided with a high-pressure gas passage 27 in communication with the high-pressure cavity 25. The gas inlet 28 of the high-pressure gas passage 27 is arranged on the support part 11. The gas flows into the high-pressure cavity 25 along the high-pressure gas passage 27 through the gas inlet 28, so as to maintain the high-pressure state in the high-pressure cavity 25. Through the pressure difference, a further sealing effect is achieved to prevent the leakage of lubricating medium from the lip end 18. The excess gas flows through the atmospheric cavity 26, the cavity of the dust-proof lip 12 and the sealing lip 13, and finally overflows at the gap between the dust-proof lip 12 and the support sleeve 14. At the same time, the dust and other impurities in the gap can be blown out, which can avoid the long-term accumulation of impurities to cause wear of the support sleeve 14 and the dust-proof lip 12. In addition, the gas flow can also take away the heat generated by the bearing rotation through heat exchange, which has a certain heat dissipation effect.

[0028] Embodiment 2:

[0029] Referring to Figure 2In the embodiment, a bearing matched with the conductive oil seal in the embodiment 1 is provided, characterized in that comprising an outer ring 31 and an inner ring 32, the outer ring 31 is provided with an annular sealing part 33 at one end, the outer circumferential surface of the sealing part 33 is in interference fit with the inner circumferential surface of the supporting part 11, and the inner ring 32 is coaxially arranged with the supporting sleeve 14 and the end parts are in close contact. The supporting sleeve 14 and the inner ring 32 are provided with a rotating shaft 17, the outer circumferential surface of the rotating shaft 17 is in interference fit with the inner circumferential surface of the supporting sleeve 14 and the inner ring 32, the rotating shaft 17 supports the supporting sleeve 14 and extrudes the outer circumferential surface of the supporting sleeve 14 towards the lip end part 18 of the sealing lip part 13, the supporting sleeve 14 compensates the shrinkage of the base material at low temperature, and the sealing failure of the oil seal at low temperature due to the looseness between the outer ring 31 and the supporting part 11 on the sealing medium side can be avoided.

[0030] The structure can be used on the sliding bearing, and the outer ring 31 and the inner ring 32 are rotationally connected to generate sliding friction. The structure can also be used on the roller bearing, and further comprises a plurality of rolling elements 34 arranged between the outer ring 31 and the inner ring 32 at equal intervals in the circumferential direction, and the rolling elements 34 can be conventional rolling elements 34 such as rolling balls and rolling needles. The rolling elements 34 of part of the roller bearing are matched with a retainer 35, the retainer 35 is arranged between the outer ring 31 and the inner ring 32, the retainer 35 can uniformly separate the rolling elements 34 in the bearing, ensure that each rolling element 34 normally rolls between the inner ring 32 and the outer ring 31, prevent the rolling elements 34 from colliding and rubbing with each other, and improve the service life of the bearing.

[0031] The above described in the specification of the present application is only an example of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, as long as it does not deviate from the content of the specification of the present application or exceed the scope defined by the claims, and should belong to the protection scope of the present application.

Claims

1. An electrically conductive oil seal, characterized in that, The support part is provided with a ring-shaped dustproof lip part towards the atmosphere side, the dustproof lip part is provided with a ring-shaped sealing lip part with an inward circular arc transition towards the sealing medium side, and a support sleeve is arranged in the sealing lip part, the outer circumferential surface of the support sleeve is attached to the lip end part of the sealing lip part, and the end part of the support sleeve towards the atmosphere side is attached to the dustproof lip part.

2. An electrically conductive oil seal according to claim 1, wherein: The dustproof lip part is coaxially provided with a plurality of groups of ring-shaped grooves at equal intervals towards the atmosphere side, and the interval and width of the ring-shaped grooves are the same.

3. The conductive oil seal of claim 1, wherein: The outer circumferential surface of the support part is provided with a ring-shaped sealing groove, and a sealing rubber ring is arranged in the sealing groove.

4. The conductive oil seal of claim 1, wherein: The lip end part of the sealing lip part is provided with a plurality of groups of sealing convex rings at the attachment part of the outer circumferential surface of the support sleeve, and a sealing cavity is formed between adjacent sealing convex rings.

5. An electrically conductive oil seal according to claim 4, wherein: The sealing convex rings are provided with three groups, and two sealing cavities are formed, including a high-pressure cavity close to the sealing medium side and an atmospheric pressure cavity close to the atmosphere side, the depth of the high-pressure cavity is greater than that of the low-pressure cavity, and the support part is provided with a high-pressure gas passage in communication with the high-pressure cavity, and the gas inlet of the high-pressure gas passage is arranged on the support part.

6. A bearing adapted to cooperate with the electrically conductive oil seal of any one of claims 1-5, characterized in that: The outer circle is provided with a ring-shaped sealing part at one end, the outer circumferential surface of the sealing part is in interference fit with the inner circumferential surface of the support part, the inner circle is coaxially arranged with the support sleeve and the end parts are attached, and the retainer is arranged between the outer circle and the inner circle.

7. The bearing of claim 6, wherein: A plurality of circumferentially equidistantly arranged rolling bodies are arranged between the outer circle and the inner circle.

8. The bearing of claim 7, wherein: The rolling body is adapted to the retainer, and the retainer is arranged between the outer circle and the inner circle.

Images