Oil seal capable of resisting high temperature and low temperature, preventing pollution and being easily disassembled and maintained and installation method of oil seal

Abstract

The invention discloses a high-temperature-resistant, low-temperature-resistant, anti-pollution and easy-to-disassemble and maintain oil seal and a mounting method thereof, and belongs to the technical field of rotary sealing. The outer framework is a ring body with an L-shaped section, a sealing ring with a U-shaped section is plugged in the outer framework in an interference manner, a main part and an outer side branch part of the sealing ring are tightly attached to the inner wall of the outer framework, a pressing ring is pressed on the outer side branch part of the sealing ring, and the pressing ring is detachably and fixedly connected with the outer framework. The method comprises the following steps that the PTFE sealing ring is plugged into the outer framework and pressed; the inner diameter model plug ring is placed in the inner ring groove of the outer framework; the sealing ring is plugged into the outer framework; pressing a pressing ring on the sealing ring and fixing the pressing ring; the outer diameter model plug ring is placed in an outer ring groove of the outer framework; and a spring is arranged on the sealing ring. The sealing ring can be rapidly replaced by dismounting the screw, rapid maintenance of the product is achieved, and the economical efficiency of the product is improved. The problem that a traditional sealing piece is poor in performance in an extreme temperature environment is solved, and medium pollution can be effectively prevented.

Description

Technical Field

[0001] The invention relates to an oil seal which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain and an installation method thereof, belonging to the technical field of rotary seals. Background Art

[0002] With the continuous advancement of my country's aviation engine technology, more stringent requirements have been put forward for the field of aviation dynamic seals. In the extreme working conditions of aviation engines and similar high-temperature, low-temperature and high-speed operation, the performance of seals is directly related to the stability and safety of the entire system.

[0003] At present, the rotary seals widely used in the market mainly include rubber lip oil seals, PTFE (polytetrafluoroethylene) oil seals and mechanical seals.

[0004] Rubber lip oil seals are widely used in a variety of applications due to their simple structure and excellent sealing performance. However, their ability to withstand high and low temperatures is limited, and they are usually unable to operate stably for a long time under extreme operating conditions such as 300°C or -60°C. Similarly, PTFE oil seals face similar usage restrictions. Although their material properties are superior to rubber in some aspects, their long-term performance in extreme temperature environments is still not ideal.

[0005] Mechanical seals are known for their high speed resistance and low leakage rate, and are suitable for occasions with extremely high requirements for sealing performance. However, mechanical seals are usually designed with rubber O-rings inside, which limits their application in high temperature environments of 300°C or low temperature environments of -60°C. In addition, the manufacturing cost of mechanical seals is high, and the disassembly and assembly process is relatively complicated, which is not conducive to the maintenance and maintenance of equipment. More importantly, whether it is a rubber lip oil seal, PTFE oil seal or mechanical seal, once installed and used, it is difficult to repair or replace, which undoubtedly increases the operating cost and downtime of the equipment.

[0006] During the disassembly process of the oil seal, if there is no suitable disassembly structure, it will often lead to damage to key components such as the oil seal lip, which will affect the reuse of the oil seal. This problem not only increases the difficulty of equipment maintenance, but also increases operating costs. Summary of the invention

[0007] In order to solve the problems existing in the background technology, the present invention provides an oil seal which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, and an installation method thereof.

[0008] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: an oil seal that is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, comprising an exoskeleton, a pressure ring and a sealing ring; the exoskeleton is a ring body with an L-shaped cross-section, the internal interference plug of the exoskeleton is connected with a sealing ring with a U-shaped cross-section, the main part and the outer branch of the sealing ring are tightly fitted with the inner wall of the exoskeleton, a pressure ring is pressed on the outer branch of the sealing ring, and the pressure ring is detachably fixedly connected to the exoskeleton.

[0009] A spring is sleeved on the outer side of the inner branch of the sealing ring, and the spring is limited and fixed by the port of the inner branch of the sealing ring.

[0010] An inner bottom surface of the outer frame is provided with an inner ring groove, and an inner diameter range plug ring is connected to the inner ring groove through an interference plug.

[0011] An outer ring groove is arranged on the outer wall of the outer frame, and an outer diameter range plug ring is connected with an interference plug in the outer ring groove.

[0012] The outer diameter range plug ring is made of polytetrafluoroethylene material.

[0013] The lower end of the inner side wall of the outer frame is plugged with one end by interference.

[0014] The sealing ring is made of polyimide material.

[0015] The end surface of the outer frame is provided with an annular plate with an L-shaped cross section, and the annular plate is provided with two notches.

[0016] The present invention discloses a method for installing an oil seal that is resistant to high and low temperatures, anti-pollution, and easy to disassemble and maintain. The method comprises the following steps:

[0017] S1: Insert the PTFE sealing ring into the outer frame and press it tightly;

[0018] S2: Place the inner diameter plug ring in the inner ring groove of the outer frame;

[0019] S3: Insert the sealing ring into the outer frame;

[0020] S4: Press the pressure ring onto the sealing ring and fix it;

[0021] S5: placing the outer diameter plug ring in the outer ring groove of the outer frame;

[0022] S6: Install the spring on the sealing ring.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The invention is easy to disassemble and repair. When the product reaches the end of its service life, the sealing ring can be quickly replaced by removing the screws without destroying the product function, thus realizing rapid maintenance of the product and improving the economic efficiency of the product. In addition, the poor performance problem of traditional seals in extreme temperature environments is solved, and stable use within the range of -60°C to 300°C is achieved. At the same time, the invention has an anti-pollution function and can effectively prevent medium contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the present invention;

[0026] Figure 2 It is a schematic diagram of the connection relationship between the sealing ring and the spring;

[0027] Figure 3 It is a K-direction schematic diagram of the exoskeleton. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the invention, rather than 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 work are within the scope of protection of the present invention.

[0029] An oil seal which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, comprises an exoskeleton 2, a pressure ring 4 and a sealing ring 5; the exoskeleton 2 is a ring body with an L-shaped cross section, the internal interference plug of the exoskeleton 2 is connected with a sealing ring 5 with a U-shaped cross section, the main part and the outer branch of the sealing ring 5 are tightly fitted with the inner wall of the exoskeleton 2, the outer branch of the sealing ring 5 is pressed with a pressure ring 4, the pressure ring 4 and the exoskeleton 2 are detachably fixedly connected by a plurality of screws 3 uniformly arranged along the circumference of the exoskeleton 2, so as to realize rapid replacement of the sealing ring 5 and product maintenance without damaging the product function.

[0030] A spring 7 is sleeved on the outer side of the inner branch of the sealing ring 5. The spring 7 is limited and fixed by the port of the inner branch of the sealing ring 5. The spring 7 can provide a continuous and stable sealing force.

[0031] The inner bottom ring of the outer frame 2 is provided with an inner ring groove in its circumferential direction. An inner diameter plug ring 6 is connected to the inner ring groove by an interference plug. The inner diameter plug ring 6 is compressed by the force transmitted by the pressure ring 4 to ensure internal sealing.

[0032] The outer wall ring of the outer skeleton 2 is provided with an outer ring groove in its circumference, and an outer diameter plug ring 1 is connected to the interference plug in the outer ring groove. After installation, the compression effect of the outer diameter plug ring 1 ensures the static sealing of the outer diameter.

[0033] The outer diameter range plug ring 1 is made of polytetrafluoroethylene material.

[0034] The lower end of the inner side wall of the outer frame 2 is plugged with one end by interference, and the PTFE sealing ring 8 has an anti-pollution function, which can prevent external impurities, media, etc. from entering the sealing position.

[0035] The sealing ring 5 is not made of materials with poor temperature resistance such as rubber, but of polyimide. As a dynamic sealing material, polyimide has the characteristics of a wide operating temperature range (-200 to 350° C.) and a low friction coefficient.

[0036] The end face ring of the outer frame 2 is circumferentially provided with an integrally formed ring plate 9 with an L-shaped cross-section, and a disassembly space is formed between the ring plate 9 and the end face of the outer frame 2. The ring plate 9 is provided with two notches 10, and the two notches 10 are arranged correspondingly. The design of the ring plate 9 allows the oil seal to be disassembled using simple tooling without destroying the oil seal and disassembling the mounting seat.

[0037] The present invention discloses a method for installing an oil seal that is resistant to high and low temperatures, anti-pollution, and easy to disassemble and maintain. The method comprises the following steps:

[0038] S1: Insert the PTFE sealing ring 8 into the outer frame 2 and press it tightly;

[0039] S2: placing the inner diameter plug ring 6 in the inner ring groove of the outer frame 2;

[0040] S3: insert the sealing ring 5 into the outer frame 2;

[0041] S4: Press the pressure ring 4 onto the sealing ring 5 and fix it;

[0042] S5: placing the outer diameter plug ring 1 in the outer ring groove of the outer frame 2;

[0043] S6: Install the spring 7 on the sealing ring 5.

[0044] When the product is disassembled, it is only necessary to unscrew the screw 3 and replace the sealing ring 5 and the spring 7.

[0045] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and range of equivalents of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0046] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An oil seal that is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, characterized by: The invention comprises an outer frame (2), a pressure ring (4) and a sealing ring (5); the outer frame (2) is a ring body with an L-shaped cross section, the inner interference plug of the outer frame (2) is connected with a sealing ring (5) with a U-shaped cross section, the main part and the outer side branch of the sealing ring (5) are tightly fitted with the inner wall of the outer frame (2), the outer side branch of the sealing ring (5) is pressed with a pressure ring (4), and the pressure ring (4) is detachably fixedly connected to the outer frame (2).

2. The oil seal according to claim 1, which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, is characterized in that: A spring (7) is sleeved on the outer side of the inner branch of the sealing ring (5), and the spring (7) is limited and fixed by a port of the inner branch of the sealing ring (5).

3. The oil seal according to claim 1, which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, is characterized by: An inner bottom surface of the outer frame (2) is provided with an inner ring groove, and an inner diameter plug ring (6) is connected to the inner ring groove through an interference fit.

4. The oil seal according to claim 3, which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, is characterized in that: The outer wall of the outer frame (2) is provided with an outer ring groove, and an outer diameter range plug ring (1) is connected to the inner surface of the outer ring groove through an interference plug.

5. The oil seal according to claim 4, which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, is characterized in that: The outer diameter range plug ring (1) is made of polytetrafluoroethylene material.

6. The oil seal according to claim 4, which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, is characterized in that: The lower end of the inner side wall of the outer frame (2) is interference-fitted with one end.

7. The oil seal according to claim 5, which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, is characterized in that: The sealing ring (5) is made of polyimide material.

8. The oil seal according to claim 5, which is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain, is characterized in that: The end surface of the outer frame (2) is provided with a ring plate (9) with an L-shaped cross section, and the ring plate (9) is provided with two notches (10).

9. A method for installing an oil seal that is resistant to high and low temperatures, anti-pollution and easy to disassemble and maintain according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: S1: insert the PTFE sealing ring (8) into the outer frame (2) and press it tightly; S2: placing the inner diameter plug ring (6) in the inner ring groove of the outer frame (2); S3: insert the sealing ring (5) into the outer frame (2); S4: Press the pressure ring (4) onto the sealing ring (5) and fix it; S5: placing the outer diameter plug ring (1) in the outer ring groove of the outer frame (2); S6: Install the spring (7) on the sealing ring (5).

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