Combined seal with conductive function

Abstract

The utility model discloses a combined seal with a conductive function, which comprises a conductive oil seal, a conductive PTFE (polytetrafluoroethylene) and a dustproof lip seal, the conductive oil seal is formed by vulcanizing a metal framework and conductive rubber, and an oil seal spring for compensating radial holding force of a rubber lip is mounted on the inner side of the conductive oil seal. The conductive PTFE is located between the conductive oil seal and the dustproof lip seal, the dustproof lip seal is located on the outermost side of the seal, and the dustproof lip seal is formed by vulcanizing rubber and a metal framework together and used for preventing external media from entering the inner side. The sealing performance is reliable, the multi-lip sealing effect is achieved, the external medium prevention function is high, and the interior can be prevented from being polluted by external sundries; and the internal and external electrifying function is strong, and electric corrosion in the bearing can be reduced.

Description

Technical Field

[0001] The utility model relates to a combined seal with a conductive function, belonging to the technical field of manufacturing key components of new-structure oil seals. Background Art

[0002] The function of a seal is to seal internal media while preventing external media from entering the seal. Today, seals face even higher demands: effective sealing, long life, protection against electrical corrosion in internal bearings, and the ability to quickly conduct current through the seal. Currently, motor-powered drives are increasingly used. Due to the characteristics of motors, the primary failure mode of motor bearings is electrical corrosion, which shortens motor life and increases maintenance costs. This creates an increasingly urgent need for conductive seals and their reliability. However, currently used conductive seals often suffer from poor applicability, sealing, and stability. Summary of the Invention

[0003] The purpose of the utility model is to provide a combined seal with a conductive function, so as to overcome the problems of poor sealing performance and stability of current conductive seals.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by the present invention is: a combined seal with a conductive function, which includes a conductive oil seal, conductive PTFE and a dust lip seal. The conductive oil seal is formed by vulcanizing a metal skeleton and conductive rubber together. An oil seal spring is installed on the inner side of the conductive oil seal to compensate for the radial clamping force of the rubber lip. The conductive PTFE is located between the conductive oil seal and the dust lip seal. The dust lip seal is located on the outermost side of the seal. The dust lip seal is formed by vulcanizing rubber and a metal skeleton together to prevent external media from entering the inner side.

[0005] As a further preferred embodiment of this solution, the metal skeleton includes a first metal skeleton and a second metal skeleton, the first metal skeleton is located inside the second metal skeleton, the first metal skeleton is connected to the conductive oil seal, and the second metal skeleton is sealed to the dust lip.

[0006] As a further preferred embodiment of this solution, a first positioning rubber layer and a second positioning rubber layer are provided between the first metal skeleton and the second metal skeleton, the front end of the conductive PTFE extends forward, and the rear end is located between the first positioning rubber layer and the second positioning rubber layer.

[0007] As a further preferred embodiment of this solution, the front end of the conductive PTFE extends obliquely inward.

[0008] As a further preferred embodiment of this solution, the inclination angle of the front end of the conductive PTFE is 30 degrees.

[0009] As a further preferred embodiment of this solution, a positioning boss is provided at the tail end of the conductive PTFE.

[0010] As a further preferred embodiment of this solution, a PTFE support is provided on the inner end of the dust lip seal, and the supporting surface of the PTFE support is an inclined surface.

[0011] As a further preferred embodiment of this solution, the outer end of the dust lip seal is provided with a dust lip opening extending obliquely outward.

[0012] As a further preferred embodiment of this solution, a spring groove is provided on the inner side of the conductive oil seal, and the oil seal spring is connected end to end to form a loop and installed in the spring groove.

[0013] As a further preferred embodiment of this solution, the conductive oil seal includes an oil seal waist and an oil seal lip, and the oil seal waist is used to support the lip area.

[0014] The beneficial effects of the utility model are as follows: the combined seal has reliable sealing performance, a multi-lip sealing effect, a strong function of preventing external media, and can prevent the interior from being contaminated by external debris; and a strong internal and external power transmission function, which can reduce the occurrence of electrical corrosion inside the bearing.

[0015] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the utility model after assembly.

[0017] Figure 2 It is an exploded schematic diagram of the utility model.

[0018] Markings in the figure are: 1-conductive oil seal, 2-conductive PTFE, 3-dustproof lip seal, 4-oil seal spring, 5-first metal frame, 6-second metal frame, 7-oil seal lip, 8-oil seal waist, 9-first positioning rubber layer, 10-second positioning rubber layer, 11-positioning boss, 12-PTFE support, 13-dustproof lip. DETAILED DESCRIPTION

[0019] 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.

[0020] like Figure 1 and 2As shown, a combined seal with conductive function includes a conductive oil seal 1, conductive PTFE 2 and a dust lip seal 3. The conductive oil seal 1 is made of a metal skeleton and conductive rubber vulcanized together. An oil seal spring 4 is installed on the inside of the conductive oil seal 1 to compensate for the radial clamping force of the rubber lip. The conductive PTFE 2 is located between the conductive oil seal 1 and the dust lip seal 3. The dust lip seal 3 is located at the outermost side of the seal. The dust lip seal 3 is made of rubber and a metal skeleton vulcanized together to prevent external media from entering the inside.

[0021] In this embodiment, the metal frame includes a first metal frame 5 and a second metal frame 6. The first metal frame 5 is located inside the second metal frame 6. The first metal frame 5 is connected to the conductive oil seal 1, and the second metal frame 6 is connected to the dust lip seal 3. A first positioning rubber layer 9 and a second positioning rubber layer 10 are provided between the first and second metal frames 5 and 6. The front end of the conductive PTFE 2 extends forward, and the rear end is located between the first and second positioning rubber layers 9 and 10. This positioning rubber layer increases friction when pressed together with the PTFE, ensuring a secure PTFE assembly. The extrusion and positioning of the conductive PTFE by the rubber ensures that there is no radial movement in its position, ensuring concentricity and enhancing the sealing effect of the second layer.

[0022] In this embodiment, the conductive PTFE 2 has a conductive function, acts as a seal, and allows current to flow. The front end of the conductive PTFE 2 extends inward at a 30-degree angle, creating an interference fit with the shaft. This provides a good seal, low frictional heat generation, and a low friction coefficient, allowing current to be conducted away. A positioning boss 11 is provided at the rear end of the conductive PTFE 2, which cooperates with the positioning rubber layer to provide a certain positioning function.

[0023] In this embodiment, the inner end of the dust lip seal 3 is provided with a PTFE support 12. The support surface of the PTFE support 12 is an inclined surface that mates with the front end of the conductive PTFE 2. The outer end of the dust lip seal 3 is provided with a dust lip 13 that extends outward at an angle. This lip transitions with the shaft, effectively preventing external media from entering the seal.

[0024] In this embodiment, a spring groove is provided on the inner side of the conductive oil seal 1, and the oil seal spring 4 is connected end to end to form a loop and installed in the spring groove to compensate for the radial clamping force of the rubber lip, making the sealing performance more durable.

[0025] In this embodiment, the conductive oil seal 1 includes an oil seal waist 8 and an oil seal lip 7. The oil seal waist 8 is used to support the lip area to improve the sealing effect. The oil seal lip 7 is molded or cut to ensure shape and size to ensure sealing.

[0026] During the production of this combined seal, adhesive is applied to the contact area between the metal frame and the rubber. The metal frame and rubber are placed in a vulcanizer and vulcanized together under high temperature, high pressure, and sufficient time. PTFE is placed between the two seals and a special pressure roll is used to form a combined seal.

[0027] The above illustrates and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not in any way limit the scope of protection of the present invention. Any technical solution obtained by equivalent substitution or other methods falls within the scope of protection of the present invention. Any portion not covered by the present invention is equivalent to or can be implemented using existing technology.

Claims

1. A combined seal with conductive function, characterized in that: It includes a conductive oil seal, conductive PTFE and a dust lip seal. The conductive oil seal is made of a metal frame and conductive rubber vulcanized together. An oil seal spring is installed on the inside of the conductive oil seal to compensate for the radial clamping force of the rubber lip. The conductive PTFE is located between the conductive oil seal and the dust lip seal. The dust lip seal is located on the outermost side of the seal. The dust lip seal is made of rubber and a metal frame vulcanized together to prevent external media from entering the inside.

2. A combined seal with conductive function according to claim 1, characterized in that: The metal frame includes a first metal frame and a second metal frame, the first metal frame is located inside the second metal frame, the first metal frame is connected to the conductive oil seal, and the second metal frame is sealed to the dust lip.

3. A combined seal with conductive function according to claim 2, characterized in that: A first positioning rubber layer and a second positioning rubber layer are provided between the first metal skeleton and the second metal skeleton. The front end of the conductive PTFE extends forward, and the rear end is located between the first positioning rubber layer and the second positioning rubber layer.

4. The combined seal with conductive function according to claim 1, characterized in that: The front end of the conductive PTFE extends obliquely inward.

5. A combined seal with conductive function according to claim 4, characterized in that: The inclination angle of the front end of the conductive PTFE is 30 degrees.

6. The combined seal with conductive function according to claim 1, characterized in that: A positioning boss is provided at the tail end of the conductive PTFE.

7. The combined seal with conductive function according to claim 1, characterized in that: A PTFE support is provided at the inner end of the dust lip seal, and the supporting surface of the PTFE support is an inclined surface.

8. The combined seal with conductive function according to claim 1, characterized in that: The outer end of the dust lip seal is provided with a dust lip opening extending obliquely outward.

9. The combined seal with conductive function according to claim 1, characterized in that: A spring groove is provided on the inner side of the conductive oil seal, and the oil seal spring is connected end to end to form a loop and is installed in the spring groove.

10. The combined seal with conductive function according to claim 1, characterized in that: The conductive oil seal comprises an oil seal waist and an oil seal lip, wherein the oil seal waist is used to support the lip area.

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