PTFE (Polytetrafluoroethylene) double-main-lip type oil seal convenient for blocking impurities

Abstract

The utility model discloses a PTFE (Polytetrafluoroethylene) double-main-lip type oil seal convenient for blocking impurities, and particularly relates to the technical field of oil seals, the PTFE double-main-lip type oil seal adopts a double-main-lip design, a PTFE lip part is used on one side for sealing gas, a rubber lip part is used on the other side for blocking impurities, two sealing liquids can be effectively isolated, main lip openings are protected, the service life of the oil seal is prolonged, and the service life of the oil seal is prolonged. Wherein a fixing assembly is arranged in the oil seal and comprises an assembling window, a first spring and a second spring, certain binding force is provided for a lip of the oil seal, the lip is kept tightly attached, the service life of the oil seal is prolonged, a reinforcing assembly is further arranged in the oil seal and comprises a first iron piece and a second iron piece, the overall framework rigidity of the oil seal is enhanced, and deformation of the oil seal is prevented. The outer ring of the oil seal is provided with a rubber outer diameter, so that the external sealing performance is ensured, external threads are convenient to take, different media can be effectively isolated and impurities can be blocked through the design of the oil seal, the excellent sealing performance is provided, the service life is prolonged, and the mechanical use cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil seals, in particular to a PTFE double main lip type oil seal which is convenient for blocking impurities. Background Art

[0002] Lip seal is a common sealing device, usually used to prevent liquid or lubricating oil from leaking in mechanical devices or external impurities from entering. It is made of soft rubber or elastic material, with a lip-shaped structure, which can contact with the shaft or sleeve to form a seal. Lip seals are commonly used in automobiles, industrial machinery, hydraulic systems and other fields. Its working principle is to contact the shaft or sleeve through the lip to form a sealing gap to prevent the leakage of liquid or lubricating oil. To enhance the sealing performance. They are usually installed around bearings or other rotating parts to protect the inside of the mechanical device from the influence of the external environment and ensure normal operation and lubrication.

[0003] Under the existing technology, due to the relatively simple single-lip structure, single-lip oil seals are mostly used in the market. Since only one lip of the single-lip oil seal contacts the shaft or sleeve, the sealing effect may not be as good as other structural seals, and it is easily affected by the external environment, such as temperature changes, changes in oil properties, etc., which may lead to unstable sealing effect;

[0004] Subsequently, a multi-lip oil seal was designed. Since the oil seal is made of soft rubber or elastic material, its wear resistance and durability may be low, and it is easy to cause damage or leakage of the seal due to friction. It is easy to leak under high-speed rotation or complex working conditions. Both oil seals have some limitations in some aspects. For this reason, we propose a PTFE double main lip oil seal that is easy to block impurities to solve the above problems. Utility Model Content

[0005] The utility model aims to solve one of the technical problems existing in the prior art or related technology.

[0006] To this end, the technical solution adopted in this utility model is:

[0007] A PTFE double main lip oil seal convenient for blocking impurities comprises an oil seal body, a mounting hole for contacting a mechanical device is provided in the middle of the oil seal body, the mounting hole penetrates the oil seal body, a plurality of rubber convex rings for preventing liquid leakage are fixedly connected to the inner wall of the mounting hole, a lip PTFE for sealing gas is fixedly connected to one side of the mounting hole, a lip rubber for blocking impurities is fixedly connected to the side of the oil seal body away from the lip PTFE, the lip rubber and the lip PTFE coincide with the axis of the oil seal body, fixing components for driving the oil seal body to fit closely with mechanical parts are provided on both sides and inside of the oil seal body, and a reinforcing component for enhancing the rigidity of the overall skeleton is provided inside the oil seal body.

[0008] Preferably, the fixing component comprises an assembly window, the assembly window is opened on a side of the oil seal body close to the lip PTFE, and the assembly window coincides with the axis of the oil seal body.

[0009] Preferably, the assembly window has a first spring built in it, the first spring is sleeved on the bottom of the inner cavity of the assembly window, and the first spring surrounds the oil seal body.

[0010] Preferably, a fixed chamber is provided in the inner cavity of the oil seal body on a side away from the first spring, and the fixed chamber surrounds the oil seal body.

[0011] Preferably, a second spring is disposed in the fixed chamber, the second spring is sleeved on the bottom of the inner cavity of the fixed chamber, and the second spring surrounds the oil seal body, and the axes of the second spring, the first spring and the oil seal body coincide.

[0012] Preferably, the reinforcement assembly includes a first iron piece, which is fixed inside the oil seal body and arranged on the side of the first spring away from the lip PTFE. One end of the first iron piece away from the first spring passes through the oil seal body and extends to one side of the fixed chamber, and the first iron piece surrounds the oil seal body.

[0013] Preferably, the reinforcement assembly also includes a second iron piece, which is fixed inside the oil seal body, and is arranged on a side of the first iron piece close to the axis of the oil seal body, and is close to the second spring, and the second iron piece surrounds the oil seal body, and the first iron piece and the second iron piece are both made of carbon steel.

[0014] Preferably, the outer ring of the oil seal body is provided with a rubber outer diameter for ensuring its own external sealing, the rubber outer diameter is fixedly connected to the oil seal body and the axis coincides, and the outer ring wall of the rubber outer diameter is provided with a plurality of evenly arranged thread grooves.

[0015] By adopting the above technical solution, the beneficial effects achieved by the utility model are as follows:

[0016] The utility model adopts a double main lip design, one side uses a PTFE lip to seal the gas, and the other side uses a rubber lip to block impurities, and can effectively isolate the two sealing liquids, protect the main lip, and extend the service life of the oil seal, wherein a fixing component is arranged inside the oil seal, including an assembly window, a first spring and a second spring, which provide a certain binding force to the oil seal lip, keep the lip tightly fitted, and extend the service life of the oil seal, and a reinforcing component is also arranged inside the oil seal, including a first iron piece and a second iron piece, which enhance the overall skeleton rigidity of the oil seal, prevent the oil seal from deformation, and ensure its normal operation, and a rubber outer diameter is arranged at the outer ring of the oil seal to ensure external sealing, and the oil seal design can effectively isolate different media, block impurities, provide excellent sealing performance, and extend the service life, and is an efficient and reliable sealing solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a schematic diagram of the internal structure assembly of the oil seal body of the utility model.

[0019] Figure 3 It is a cross-sectional view of the internal structure of the utility model.

[0020] Figure 4 For this utility model Figure 3 Sectional view of the middle structure.

[0021] In the figure: 1. oil seal body; 101. assembly hole; 102. rubber convex ring; 103. lip PTFE; 104. lip rubber; 2. fixing component; 201. assembly window; 202. first spring; 203. fixing chamber; 204. second spring; 3. reinforcement component; 301. first iron piece; 302. second iron piece; 4. rubber outer diameter; 401. thread groove. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] Example: Figure 1-Figure 4As shown, the utility model provides a PTFE double main lip oil seal that is convenient for blocking impurities, including an oil seal body 1, a mounting hole 101 for contacting a mechanical device is opened in the middle of the oil seal body 1, the mounting hole 101 passes through the oil seal body 1, and a plurality of rubber convex rings 102 for preventing liquid leakage are fixedly connected to the inner wall of the mounting hole 101. The double main lip design isolates two sealing liquids. The combined oil seal can effectively block impurities in the sealing medium, thereby protecting the main lip and extending the service life of the oil seal.

[0024] A lip PTFE 103 for sealing gas is fixedly connected to one side of the assembly hole 101, and a lip rubber 104 for blocking impurities is fixedly connected to the side of the oil seal body 1 away from the lip PTFE 103. The lip rubber 104 and the lip PTFE 103 coincide with the axis of the oil seal body 1. Main lips are designed on both sides of the oil seal body 1. The lip PTFE 103 seals gas and has a dynamic sealing surface with excellent chemical resistance, high and low temperature resistance, self-lubrication and friction resistance. The dynamic sealing surface of the lip rubber 104 has elastic properties and can effectively block impurities, thereby protecting the main lip and extending the service life of the oil seal.

[0025] Furthermore, a fixing assembly 2 for driving the oil seal body 1 to fit closely with the mechanical parts is provided on both sides and inside thereof, wherein the fixing assembly 2 comprises an assembly window 201, which is provided on a side of the oil seal body 1 close to the lip PTFE 103, and the assembly window 201 coincides with the axis of the oil seal body 1, and a first spring 202 is built into the assembly window 201, and the first spring 202 is sleeved on the bottom of the inner cavity of the assembly window 201, and the first spring 202 surrounds the oil seal body 1 for one week, and a fixing chamber 203 is provided on a side of the inner cavity of the oil seal body 1 away from the first spring 202, and the fixing chamber 203 surrounds the oil seal body 1 for one week, and a second spring 204 is built into the fixing chamber 203, and the second spring 204 is sleeved on the bottom of the inner cavity of the fixing chamber 203, and the second spring 204 surrounds the oil seal body 1 for one week, and the axes of the second spring 204, the first spring 202 and the oil seal body 1 coincide, and the springs are all made of carbon steel, which provide a certain binding force to the oil seal lip and extend the service life of the oil seal;

[0026] Furthermore, a reinforcing component 3 for enhancing the rigidity of the overall skeleton is provided inside the oil seal body 1. The reinforcing component 3 includes a first iron piece 301, which is fixed inside the oil seal body 1 and is arranged on the side of the first spring 202 away from the lip PTFE 103. One end of the first iron piece 301 away from the first spring 202 passes through the oil seal body 1 and extends to the side of the fixed chamber 203. The first iron piece 301 surrounds the oil seal body 1. The reinforcing component 3 also includes a second iron piece 302, which is fixed inside the oil seal body 1 and is arranged on the side of the first iron piece 301 close to the axis of the oil seal body 1. The second iron piece 302 is close to the second spring 204 and surrounds the oil seal body 1. Both the first iron piece 301 and the second iron piece 302 are made of carbon steel. The basic skeleton increases the rigidity so that the oil seal will not be easily deformed.

[0027] The outer ring of the oil seal body 1 is provided with a rubber outer diameter 4 for ensuring its own external sealing. The rubber outer diameter 4 is fixedly connected to the oil seal body 1 and the axis coincides. The outer ring wall of the rubber outer diameter 4 is provided with a plurality of evenly arranged thread grooves 401. The rubber outer diameter 4 is a static sealing surface to ensure the sealing of the outer diameter.

[0028] Working principle: Double main lip design: The oil seal adopts a double main lip design, with PTFE lip sealing gas on one side and rubber lip blocking impurities on the other side. It can effectively isolate the two sealing liquids, protect the main lip, and extend the service life of the oil seal.

[0029] Fixing assembly 2: A fixing assembly 2 is provided inside the oil seal, including an assembly window 201, a first spring 202 and a second spring 204, which provide a certain binding force to the lip of the oil seal, keep the lip in close contact, and extend the service life of the oil seal.

[0030] Reinforcement component 3: A reinforcement component 3 is also provided inside the oil seal, including a first iron piece 301 and a second iron piece 302, to enhance the overall rigidity of the oil seal skeleton, prevent the oil seal from deforming, and ensure its normal operation.

[0031] External sealing: The outer ring of the oil seal is provided with a rubber outer diameter 4 to ensure external sealing and help improve the sealing effect.

[0032] This oil seal design can effectively isolate different media, block impurities, provide excellent sealing performance, and extend service life. It is an efficient and reliable sealing solution.

[0033] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A PTFE double main lip oil seal that is convenient for blocking impurities, characterized in that: The oil seal body (1) comprises an assembly hole (101) for contacting a mechanical device in the middle of the oil seal body (1), the assembly hole (101) passing through the oil seal body (1), a plurality of rubber convex rings (102) for preventing liquid leakage are fixedly connected to the inner wall of the assembly hole (101), a lip PTFE (103) for sealing gas is fixedly connected to one side of the assembly hole (101), a lip rubber (104) for blocking impurities is fixedly connected to the side of the oil seal body (1) away from the lip PTFE (103), the lip rubber (104) and the lip PTFE (103) coincide with the axis of the oil seal body (1), both sides and the inside of the oil seal body (1) are provided with fixing components (2) for driving the oil seal body (1) to fit closely with the mechanical parts, and a reinforcing component (3) for enhancing the rigidity of the overall skeleton is provided inside the oil seal body (1).

2. A PTFE double main lip oil seal for blocking impurities according to claim 1, characterized in that: The fixing component (2) comprises an assembly window (201), wherein the assembly window (201) is opened on a side of the oil seal body (1) close to the lip PTFE (103), and the assembly window (201) coincides with the axis of the oil seal body (1).

3. A PTFE double main lip oil seal for blocking impurities according to claim 2, characterized in that: The assembly window (201) has a first spring (202) built in it. The first spring (202) is sleeved on the bottom of the inner cavity of the assembly window (201), and the first spring (202) surrounds the oil seal body (1).

4. A PTFE double main lip oil seal for blocking impurities according to claim 3, characterized in that: A fixed chamber (203) is provided on a side of the inner cavity of the oil seal body (1) away from the first spring (202), and the fixed chamber (203) surrounds the oil seal body (1).

5. A PTFE double main lip oil seal for blocking impurities according to claim 4, characterized in that: The fixed chamber (203) contains a second spring (204), which is sleeved on the bottom of the inner cavity of the fixed chamber (203). The second spring (204) surrounds the oil seal body (1), and the axes of the second spring (204), the first spring (202) and the oil seal body (1) coincide.

6. A PTFE double main lip oil seal for blocking impurities according to claim 1, characterized in that: The reinforcing assembly (3) comprises a first iron piece (301), the first iron piece (301) being fixed inside the oil seal body (1), and the first iron piece (301) being arranged on a side of the first spring (202) away from the lip PTFE (103), one end of the first iron piece (301) away from the first spring (202) passing through the oil seal body (1) and extending to a side of the fixed chamber (203), and the first iron piece (301) surrounds the oil seal body (1) for a circle.

7. A PTFE double main lip oil seal for blocking impurities according to claim 1, characterized in that: The reinforcing assembly (3) further comprises a second iron piece (302), the second iron piece (302) being fixed inside the oil seal body (1), the second iron piece (302) being arranged on a side of the first iron piece (301) close to the axis of the oil seal body (1), the second iron piece (302) being close to the second spring (204), the second iron piece (302) surrounding the oil seal body (1), and the first iron piece (301) and the second iron piece (302) being both made of carbon steel.

8. A PTFE double main lip oil seal for blocking impurities according to claim 7, characterized in that: The outer ring of the oil seal body (1) is provided with a rubber outer diameter (4) for ensuring its own external sealing performance; the rubber outer diameter (4) is fixedly connected to the oil seal body (1) and their axes coincide with each other; and the outer ring wall of the rubber outer diameter (4) is provided with a plurality of evenly arranged thread grooves (401).

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