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High-pressure reciprocating sealing structure

A sealing structure and high-pressure technology, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of reliability, pressurization and pressure-holding performance gap, etc., and achieve the effect of low friction, zero leakage and reliable sealing performance

Pending Publication Date: 2019-07-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] With the rapid development of my country's smart car industry, automatic driving has become the future development trend. The most critical core technology in automatic driving is the brake-by-wire system. Whether it is high-speed driving or urban working conditions, the braking system needs to be involved at any time. Dynamic is a key system related to driving safety, and must have high reliability and high-speed response characteristics. Its underlying hardware is a hydraulic brake cylinder. Key components, while my country's car companies mainly rely on imports at present, there is a big gap with foreign products in terms of reliability, pressurization and pressure holding performance

Method used

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Examples

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Embodiment 1

[0027] The invention discloses a high-pressure reciprocating sealing structure, including:

[0028] Sealing ring 1, said sealing ring 1 is a polytetrafluoroethylene composite material added with relevant additives, and has an ultra-low coefficient of friction. The seal ring 1 has a left-right symmetrical structure, and the middle part of one side in contact with the oil cylinder mating surface 4 has a middle groove 5, and the other side has a sealing bottom 6 at a position opposite to the middle groove 5. The left and right sides of the sealing bottom 6 are symmetrically provided with sealing grooves 7; the X-shaped sealing ring 2 is installed in the middle groove 5, and the O-shaped sealing ring 3 is symmetrically installed in the sealing groove 7 Inside; the sealing ring 1 is located on both sides of the middle groove 5 with symmetrically distributed sealing lips 8, and the sealing lips 8 are in contact with the oil cylinder mating surface 4 in a platform structure with a le...

Embodiment 2

[0042] The difference from Example 1 is that the width of the sealing bottom 6 is greater than the width of the middle groove 5; the distance from the top of the sealing groove 5 to the middle of the lower edge of the sealing bottom 6 is the O-shaped 2 / 3~1 times of the diameter of the sealing ring 3 . Through the structural design of the sealing bottom 6 on the sealing ring 1, it can provide good rear support for the O-ring 3 during the dynamic sealing process, prolonging the service life of the O-ring 3; the sealing grooves 7 on both sides can be the first The road seal provides greater support and improves sealing performance. Two sides of the bottom of the sealing bottom 6 extend toward the sealing groove 7 .

Embodiment 3

[0044] The difference from Example 2 is that the sealing ring 1 and the oil cylinder mating surface 4 have 4 seals, and one side has 2 seals. After the sealing fluid passes through the second sealing gap, an obvious throttling effect is produced, and the sealing pressure drops rapidly. , Low-pressure fluid is more likely to be sealed through the X-shaped sealing ring, and the sealing performance is good. This embodiment has simple structure, low processing cost, high structural strength, and low risk of fatigue failure after working for a long time.

[0045] The present invention has following beneficial effect:

[0046] 1. The sealing ring is sealed by a multi-stage labyrinth, which can effectively reduce the oil pressure and leakage. The design of the front lip angle is much larger than the rear lip angle, so that the pressure gradient near the front lip angle is greater than the pressure gradient of the lip rear angle, which is conducive to reciprocating movement The anti-...

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Abstract

The invention discloses a high-pressure reciprocating sealing structure comprising a sealing ring, X-shaped sealing rings and O-type sealing rings. The sealing rings are of a left-right symmetric structure, the sides, in contact with a mating surface of an oil cylinder, of the sealing rings are provided with middle grooves, the other sides of the sealing rings are provided with sealing bottoms, and the left and right sides of each sealing bottom are provided with sealing grooves; the X-shaped sealing rings are installed in the middle grooves, and the O-type sealing rings are installed in the sealing grooves; sealing lips are arranged at the positions, on the two sides of the middle groove, of the sealing ring, the sealing lip is in contact with the mating surface of the oil cylinder through a platform structure, and a multi-labyrinth sealing structure is formed; along with leftward or rightward movement of a piston, the sealing lip on the corresponding side plays a main sealing role, and two-way sealing is achieved. By means of the high-pressure reciprocating sealing structure, through cooperation design of the left and right symmetrical sealing rings, the X-shaped sealing rings and the O-type sealing rings, the flow of high-pressure oil and gas can be effectively cut off, zero leakage is realized, it is ensured that the sealing structure has the reliable sealing performance and low friction force under the high pressure and the extreme high and low temperature environment, and the fatigue life is long.

Description

technical field [0001] The invention relates to the field of seals, in particular to a high-pressure reciprocating sealing structure. Background technique [0002] With the increasing demand for lightweight, miniaturized and low energy consumption of mechanical structures, hydraulic systems are developing towards high pressure and high precision. The sealing and friction properties of hydraulic sealing components become the key to determine the performance of the system, especially for high-precision servo cylinders, aerospace and other hydraulic systems, which require high reliability of the seal under high pressure and high speed, no leakage during continuous long-term work, and Small friction is required to improve system efficiency and reduce energy consumption. However, the currently used hydraulic sealing system can usually only perform one-way sealing under 35MPa low pressure, such as Stretch seal, U-shaped seal, Y-shaped seal, etc. If the two-way seal needs to be us...

Claims

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Application Information

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IPC IPC(8): F16J15/3232F16J15/3268F16J15/3284F16J15/447
CPCF16J15/3232F16J15/3268F16J15/3284F16J15/447
Inventor 张守元吕振华
Owner TSINGHUA UNIV
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