Conductive oil seal and motor
By designing conductive carbon brushes and conductive skeletons, a stable conductive path is formed, which solves the problem of increased resistance of conductive oil seals in environments with high humidity or oil and gas immersion. This achieves stability and continuity of conductivity, avoids discharge phenomena, and extends the service life of the system.
Patent Information
- Application Number
- CN202423108544.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2034-12-16
AI Technical Summary
The resistance of conductive oil seals increases in environments with high humidity or oil immersion, leading to a decrease in conductivity and making it impossible to meet the requirements for continuous and stable conductivity.
A conductive carbon brush is connected to a conductive frame, with the other end of the carbon brush abutting against the outer wall of the shaft to form a stable conductive path. The shaft voltage is conducted to the conductive frame and then guided to the motor housing through the conductive carbon brush, thereby enhancing the stability of the conductivity.
To ensure the continuity of the conductive path, reduce resistance and wear during current conduction, improve the stability of conductivity, avoid oil film discharge, and extend the system's service life.
Smart Images
Figure CN223957413U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to motor seal technical field, especially related to a kind of electrically-conductive oil seal and motor. BACKGROUND
[0002] Electrically-conductive oil seal is a kind of special oil seal, its main function is to keep the sealing performance of lubricating oil while allowing shaft voltage to be conducted through oil seal, to avoid the discharge phenomenon formed between oil film. This oil seal is usually made of material with electrically-conductive performance, can form a conductive path between motor shaft and bearing, safely guide shaft voltage to motor housing, avoid voltage accumulation to cause oil film breakdown. However, in the environment of greater humidity or oil gas immersion, the resistance value of electrically-conductive oil seal will increase, resulting in its electrically-conductive performance decline, unable to meet the requirement of continuous stable conduction. SUMMARY
[0003] The main purpose of the utility model is to propose a kind of electrically-conductive oil seal and motor, to improve the stability of the electrically-conductive performance of electrically-conductive oil seal.
[0004] To achieve the above object, the utility model provides an electrically-conductive oil seal, comprising:
[0005] Electrically-conductive framework;
[0006] Oil seal main body, the oil seal main body is set on the outside of shaft body and is located between the shaft body and the shell, the oil seal main body at least wraps part structure of the electrically-conductive framework, and part structure of the oil seal main body is located between the electrically-conductive framework and the shaft body;And
[0007] Electrically-conductive carbon brush, one end of the electrically-conductive carbon brush is connected with the electrically-conductive framework, and the other end of the electrically-conductive carbon brush is arranged through the oil seal main body to be in contact with the outer wall of the shaft body.
[0008] In an embodiment, the electrically-conductive framework includes first annular framework and second annular framework, and the second annular framework is set on the outside of the first annular framework;
[0009] At least part of the structure of the electrically-conductive carbon brush is clamped between the first annular framework and the second annular framework.
[0010] In an embodiment, the oil seal main body includes first sealing section, second sealing section and connecting section, the first sealing section and the second sealing section are arranged at intervals along the radial direction of the shaft body and are in contact with the shell and the shaft body respectively, and the connecting section connects the first sealing section and the second sealing section;
[0011] The first annular skeleton is L-shaped in cross section, the vertical section and the horizontal section of the first annular skeleton are respectively arranged in the first sealing section and the connecting section, and the horizontal section of the first annular skeleton is arranged towards the shaft body away from one end of the vertical section of the first annular skeleton.
[0012] The second annular skeleton is L-shaped in cross section, the vertical section and the horizontal section of the second annular skeleton are respectively arranged in the second sealing section and the connecting section, and the horizontal section of the second annular skeleton is arranged towards the shaft body away from two ends of the vertical section of the second annular skeleton.
[0013] Part of the structure of the conductive carbon brush is clamped between the horizontal section of the first annular skeleton and the horizontal section of the second annular skeleton.
[0014] In an embodiment, the first sealing section is provided with a mounting groove on the side facing the shell, the vertical section of the first annular skeleton is arranged in the mounting groove, and the vertical section of the first annular skeleton is in abutting contact with the shell near the side wall of the shell.
[0015] In an embodiment, the outer side of the connecting section is provided with a groove.
[0016] In an embodiment, the second sealing section is provided with a sealing lip on the side facing the shaft body, and one end of the sealing lip away from the first sealing section is arranged towards the shaft body.
[0017] The second sealing section is provided with a dust lip on the side facing the shaft body, and one end of the dust lip away from the first sealing section is arranged towards the shaft body.
[0018] In an embodiment, the first annular skeleton and the second annular skeleton are in interference fit.
[0019] In an embodiment, the conductive oil seal comprises a plurality of carbon brush clusters, each of the carbon brush clusters comprises a plurality of conductive carbon brushes, and the plurality of carbon brush clusters are arranged in a circumferential direction of the shaft body.
[0020] In an embodiment, one end of the plurality of conductive carbon brushes in the carbon brush cluster is arranged towards the conductive skeleton, and the other end is arranged to diverge in all directions.
[0021] The utility model also provides a motor which comprises the conductive oil seal as described above.
[0022] The conductive oil seal provided by the utility model discloses through setting one end of the conductive carbon brush as being connected with the conductive framework, setting the other end as being penetrated through the oil seal main body to abut against the outer side wall of the shaft body, making the conductive carbon brush always keep contact with the shaft body and the conductive framework under the action of the elastic pressure, further guaranteeing that the conductive path is formed between the shaft body and the conductive framework, even when the shaft body jumps or the oil seal main body wears, the continuity of the conductive path can be ensured, thereby improving the stability of the conductive performance. BRIEF DESCRIPTION OF DRAWINGS
[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, below will briefly introduce the drawings needed to be used in the embodiments or prior art description, obviously, the drawings in the following description are only some embodiments of the present utility model, and for those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative labor.
[0024] Figure 1 The structural schematic diagram of one embodiment of the conductive oil seal provided by the present utility model.
[0025] Explanation of the reference numerals:
[0026] 100, conductive oil seal;1, conductive framework;11, first annular framework;12, second annular framework;2, oil seal main body;21, first sealing section;211, mounting groove;22, second sealing section;23, connecting section;231, recess;24, sealing lip;25, dust lip;3, carbon brush cluster;31, conductive carbon brush;
[0027] 200, shaft body.
[0028] The realization, functional characteristics and advantages of the present utility model will be further illustrated by combining with the embodiments and referring to the drawings. DETAILED DESCRIPTION
[0029] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present utility model.
[0030] It should be noted that if the embodiments of the present utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.
[0031] In addition, if the embodiments of the present utility model involve descriptions of "first", "second", etc., the descriptions of "first", "second", etc. are only for description purposes, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, "and / or" or "and / or" appearing throughout the text means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B simultaneously satisfy the scheme. 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 unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present utility model.
[0032] The present utility model provides a kind of conductive oil seal 100.
[0033] Please refer to Figure 1 In an embodiment of the present utility model, the conductive oil seal 100 includes a conductive framework 1, an oil seal body 2, and a conductive carbon brush 31. The oil seal body 2 is sleeved on the outer side of the shaft body 200 and located between the shaft body 200 and the casing. The oil seal body 2 at least wraps part of the structure of the conductive framework 1, and part of the structure of the oil seal body 2 is located between the conductive framework 1 and the shaft body 200. One end of the conductive carbon brush 31 is connected with the conductive framework 1, and the other end of the conductive carbon brush 31 penetrates the oil seal body 2 to abut and contact with the outer side wall of the shaft body 200.
[0034] The conductive oil seal 100 provided by the utility model is characterized in that one end of the conductive carbon brush 31 is arranged in connection with the conductive framework 1, and the other end is arranged in penetration of the oil seal body 2 to be in contact with the outer side wall of the shaft body 200, so that the conductive carbon brush 31 is always in contact with the shaft body 200 and the conductive framework 1 under the action of elastic pressure, thereby ensuring that the conductive path is formed between the shaft body 200 and the conductive framework 1, and even when the shaft body 200 jumps or the oil seal body 2 is worn, the continuity of the conductive path can be ensured, thereby improving the stability of the conductive performance. Specifically, when the shaft body 200 rotates, the conductive carbon brush 31 will rotate with it and keep contact with the outer side wall of the shaft body 200, and the shaft voltage is conducted to the conductive framework 1 through the conductive carbon brush 31, and then guided to the motor housing by the conductive framework 1, thereby avoiding the discharge phenomenon between the oil film, and when the resistance value of the conductive oil seal 100 is behind, since the conductive carbon brush 31 has good conductivity and wear resistance, the resistance and wear in the current conduction process can be effectively reduced, and the additional conductive path provided by the conductive carbon brush 31 can still maintain its conductive function, further improving the stability of the conductive performance.
[0035] It should be noted that the oil seal body 2 is the main component of the conductive oil seal 100, and its function is to prevent lubricating oil leakage and external contaminants from entering the mechanical interior, so the oil seal body 2 can be made of different materials, depending on the application scenario and working conditions, such as rubber, polytetrafluoroethylene or polyurethane, etc., in addition, part of the structure of the oil seal body 2 is located between the conductive framework 1 and the shaft body 200, mainly to provide better elastic sealing contact, which can effectively prevent oil from entering the system interior, thereby ensuring the sealing and protection of the system, and the oil seal body 2 made of elastic material can form a buffer layer between the shaft body 200 and the conductive framework 1, reducing wear caused by friction and vibration, thereby prolonging the service life of the system.
[0036] Further, to improve the connection stability between the conductive carbon brush 31 and the conductive framework 1, in an embodiment, the conductive framework 1 comprises a first annular framework 11 and a second annular framework 12, the second annular framework 12 is sleeved outside the first annular framework 11; at least part of the structure of the conductive carbon brush 31 is clamped between the first annular framework 11 and the second annular framework 12, in this way, the connection area and the contact pressure between the conductive carbon brush 31 and the conductive framework 1 are increased, thereby improving the connection stability. Specifically, during manufacturing, the conductive carbon brush 31 can be clamped between the first annular framework 11 and the second annular framework 12, so that the carbon brush and the rubber material of the oil seal body 2 are integrally vulcanized during the vulcanization process. During the vulcanization process, the rubber material is heated and pressure is applied, so that the rubber is in close contact with the carbon brush and the two annular frameworks. When the vulcanization reaction occurs, the rubber material will penetrate between the bristles of the carbon brush and solidify after cooling, forming a firm physical connection, thereby enhancing the connection between the conductive carbon brush 31 and the conductive framework 1. In this way, the carbon brush and the rubber material form a single composite, which can improve the mechanical strength and stability of the connection and prevent the carbon brush from falling off due to vibration or mechanical impact during use. In other embodiments, the carbon brush can be connected with the conductive framework 1 using hot pressing technology.
[0037] In an embodiment, the oil seal body 2 comprises a first sealing section 21, a second sealing section 22, and a connecting section 23, the first sealing section 21 and the second sealing section 22 are arranged along the radial direction of the shaft body 200 and are in abutting contact with the casing and the shaft body 200 respectively, and the connecting section 23 connects the first sealing section 21 and the second sealing section 22; the cross section of the first annular framework 11 is L-shaped, the vertical section and the horizontal section of the first annular framework 11 are respectively accommodated in the first sealing section 21 and the connecting section 23, and the horizontal section of the first annular framework 11 away from the end of the vertical section of the first annular framework 11 is arranged towards the shaft body 200; the cross section of the second annular framework 12 is L-shaped, the vertical section and the horizontal section of the second annular framework 12 are respectively accommodated in the second sealing section 22 and the connecting section 23, and the horizontal section of the second annular framework 12 away from the two ends of the vertical section of the second annular framework 12 is arranged towards the shaft body 200; part of the structure of the conductive carbon brush 31 is clamped between the horizontal section of the first annular framework 11 and the horizontal section of the second annular framework 12. In the above embodiment, the size and shape of the L-shaped first annular framework 11 and the L-shaped second annular framework 12 need to be matched, which helps to achieve uniform pressure distribution, reduce local wear, improve sealing effect, and enable the conductive framework 1 to maintain stable shape and position in the axial and radial directions, thereby reducing wear caused by vibration or axial movement,
[0038] In an embodiment, the first sealing section 21 is provided with a mounting groove 211 on the side facing the shell, the vertical section of the first annular skeleton 11 is accommodated in the mounting groove 211, and the vertical section of the first annular skeleton 11 is in abutting contact with the side wall of the shell. By accommodating the vertical section of the first annular skeleton 11 in the mounting groove 211 and directly contacting the shell, higher position accuracy and stability can be provided. However, in actual production, in order to improve the sealing performance between the first annular skeleton 11 and the shell, the first annular skeleton is usually in interference fit with the shell, that is, the outer circumferential surface of the vertical section of the first annular skeleton is slightly larger than the diameter of the mounting hole of the shell. Cold pressing, hot mounting or hydraulic methods are usually used for assembly to provide very high fastening force and position accuracy, so as to ensure that the conductive oil seal 100 does not move relative to the shell.
[0039] In an embodiment, the outer side of the connecting section 23 is provided with a groove 231, which can reduce the use of materials without affecting the function and performance of the conductive oil seal 100, reduce the material cost, improve the market competitiveness of the product, and reduce the overall weight of the conductive oil seal 100 while reducing the amount of material used, which can reduce the load of the bearing and improve the operating efficiency of the equipment.
[0040] Further, in order to improve the sealing performance of the conductive oil seal 100, in an embodiment, the second sealing section 22 is provided with a sealing lip 24 on the side facing the shaft 200, and the sealing lip 24 is in abutting contact with the outer side wall of the shaft 200. The main function of the sealing lip 24 is to form a reliable sealing barrier to prevent the leakage of lubricating oil, hydraulic oil or other fluids, and to prevent external contaminants (such as dust, moisture, etc.) from entering the sealing area. Generally, the material of the sealing lip 24 is designed to be consistent with the material of the oil seal body 2, so it has a certain elasticity, which enables the sealing lip 24 to effectively contact the outer side wall of the shaft 200 and form a linear contact surface. In this way, the relative movement or axial displacement between the shaft 200 and the sealing member can be compensated to a certain extent, and the sealing effect can be maintained.
[0041] In another embodiment, the second sealing section 22 is provided with a dust lip 25 on the side facing the shaft body 200. The dust lip 25 is arranged away from the first sealing section 21 and towards the shaft body 200. The main function of the dust lip 25 is to prevent external dust, particles and other contaminants from entering the sealing area, which can damage the sealing lip 24 or the shaft body 200, resulting in a decrease in sealing performance. Therefore, the dust lip 25 also needs to have certain sealing performance to provide certain auxiliary sealing effect. It should be noted that the contact between the dust lip 25 and the outer wall of the shaft body 200 is usually slight or has a small gap to avoid excessive friction and wear when the shaft body 200 rotates. In other embodiments, the dust lip 25 and the sealing lip 24 are usually arranged simultaneously and are spaced apart in the axial direction of the shaft body 200. The dust lip 25 is located on the outside, and the sealing lip 24 is located on the inside of the dust lip 25. The dust lip 25 provides the first line of defense to prevent contaminants from entering, and the sealing lip 24 ensures good sealing performance even in the presence of contaminants. The double-lip design can improve the reliability of the sealing system and reduce the downtime of the equipment due to sealing failure.
[0042] Further, in order to enhance the stability of the conductive carbon brush 31, in an embodiment, the first annular skeleton 11 and the second annular skeleton 12 are interference fitted, that is, the outer circumferential surface of the vertical section of the first metal skeleton is slightly larger in diameter than the inner circumferential surface of the vertical section of the second annular skeleton 12. Cold pressing, hot assembly or hydraulic pressure and other methods are usually used for assembly, which can increase the friction and mechanical locking between them to tightly press one end of the conductive carbon brush 31 between the two annular skeletons, ensuring the stability of the conductive carbon brush 31.
[0043] In an embodiment, the conductive oil seal 100 includes a plurality of carbon brush clusters 3, each of which includes a plurality of conductive carbon brushes 31, and the plurality of carbon brush clusters 3 are spaced apart in the circumferential direction of the shaft body 200. Among them, "a plurality of carbon brush clusters 3" means that the conductive oil seal 100 contains a plurality of groups composed of conductive carbon brushes 31; "spaced apart in the circumferential direction of the shaft body 200" means that these carbon brush clusters 3 are spaced apart at a certain distance in the circumferential direction of the shaft body 200. This design can increase the contact area between the conductive carbon brush 31 and the shaft body 200, improve the conductivity and wear resistance, and make the conductive carbon brush 31 better cover and contact the surface of the shaft body 200, further reduce the contact resistance, and evenly distribute the wear, thereby prolonging the service life of the conductive oil seal 100.
[0044] In an embodiment, one end of the plurality of conductive carbon brushes 31 in the carbon brush cluster 3 is arranged in the conductive framework 1, and the other end is arranged to diverge in all directions. In this way, the one end of the plurality of conductive carbon brushes 31 in the carbon brush cluster 3 is concentrated and connected to one point of the conductive framework 1 (generally, the one end of the plurality of conductive carbon brushes 31 is pressed tightly at the same position), and then a point for fixing the carbon brush cluster 3 is designed on the conductive framework 1, so that the carbon brush cluster 3 can be conveniently installed and fixed at the appropriate position, thereby simplifying the production and manufacturing process, and in addition, the other end of the conductive carbon brush 31 is arranged to diverge in all directions, which can increase the contact area with the shaft body 200, improve the conductivity and wear resistance. Such design helps to uniformly distribute the current, reduce local wear, and improve the reliability of the conductive oil seal 100.
[0045] The utility model also proposes a motor, the motor includes conductive oil seal 100, the specific structure of conductive oil seal 100 refers to the above embodiment, because the motor has adopted all technical schemes of the above all embodiments, therefore at least has all beneficial effects brought by the technical scheme of the above embodiment, here will not repeat again.
[0046] The above is only an exemplary embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation made by the utility model specification and the drawings contents, or direct / indirect application in other related technical fields under the technical concept of the utility model is included in the patent protection range of the utility model.
Claims
1. An electrically conductive oil seal, characterized in that, The conductive oil seal comprises: a conductive framework; an oil seal body, which is sleeved outside the shaft body and between the shaft body and the casing, at least wraps part of the conductive framework, and part of the oil seal body is between the conductive framework and the shaft body; and a conductive carbon brush, one end of which is connected with the conductive framework, and the other end of which penetrates the oil seal body to abut against the outer wall of the shaft body.
2. The conductive oil seal of claim 1, wherein, The conductive framework comprises a first annular framework and a second annular framework, and the second annular framework is sleeved outside the first annular framework. At least part of the conductive carbon brush is clamped between the first annular framework and the second annular framework.
3. The conductive oil seal of claim 2, wherein, The oil seal body comprises a first sealing section, a second sealing section and a connecting section, the first sealing section and the second sealing section are arranged along the radial direction of the shaft body and abut against the casing and the shaft body respectively, and the connecting section connects the first sealing section and the second sealing section. The first annular framework has an L-shaped cross section, the vertical section and the horizontal section of the first annular framework are respectively arranged in the first sealing section and the connecting section, and the horizontal section of the first annular framework is arranged towards the shaft body away from one end of the vertical section of the first annular framework. The second annular framework has an L-shaped cross section, the vertical section and the horizontal section of the second annular framework are respectively arranged in the second sealing section and the connecting section, and the horizontal section of the second annular framework is arranged towards the shaft body away from both ends of the vertical section of the second annular framework. Part of the conductive carbon brush is clamped between the horizontal section of the first annular framework and the horizontal section of the second annular framework.
4. The conductive oil seal of claim 3, wherein, The side of the first sealing section facing the casing is provided with a mounting groove, the vertical section of the first annular framework is arranged in the mounting groove, and the vertical section of the first annular framework abuts against the casing close to the side wall of the casing.
5. The conductive oil seal of claim 3, wherein, The outer side of the connecting section is provided with a groove.
6. The conductive oil seal of claim 3, wherein, The side of the second sealing section facing the shaft body is provided with a sealing lip, and one end of the sealing lip away from the first sealing section is arranged towards the shaft body; and / or The side of the second sealing section facing the shaft body is provided with a dust lip, and one end of the dust lip away from the first sealing section is arranged towards the shaft body.
7. The conductive oil seal of claim 2, wherein The first annular framework and the second annular framework are in interference fit.
8. The conductive oil seal of any one of claims 1 to 7, wherein, The conductive oil seal comprises a plurality of carbon brush clusters, each of which comprises a plurality of conductive carbon brushes, and the plurality of carbon brush clusters are arranged along the circumferential direction of the shaft body.
9. The conductive oil seal of claim 8, wherein, One end of the plurality of conductive carbon brushes in the carbon brush cluster is arranged centrally on the conductive framework, and the other end is arranged divergently in all directions.
10. An electric machine characterized by The conductive oil seal comprises the conductive oil seal according to any one of claims 1 to 9.