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Y type sealing unit

A technology of sealing unit and sealing ring, which is applied in the direction of engine sealing, engine components, mechanical equipment, etc., can solve the problems of reducing the sealing compensation effect, small movement speed, poor sealing of hydraulic cylinders, etc., to achieve enhanced sealing effect and increased service life , Eliminate the effect of poor oil passage

Inactive Publication Date: 2011-12-14
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Application Information

AI Technical Summary

Problems solved by technology

[0021] Aiming at the above technical problems, the present invention designs a new type of sealing assembly based on a Y-shaped ring, which solves the problems of poor sealing and low moving speed of such frequent reciprocating hydraulic cylinders, and reduces wear and improves the protection of the worn parts. Seal Compensation Effect

Method used

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Embodiment Construction

[0042] See Figure 4 , Figure 5 , Put the retaining ring 12 and the Y-shaped sealing ring 13 into the seal groove of the guide sleeve 8 (or piston), the Y-shaped sealing unit 13 is assembled, after injecting hydraulic oil, even if the Y-shaped sealing ring 13 and the guide sleeve 8 The gap between them is small, and the hydraulic oil will also smoothly enter the inner cavity of the Y-shaped sealing ring through the oil inlet hole of the guide sleeve, so that the inner and outer lips of the Y-shaped sealing ring are close to the inner and outer sealing surfaces 9. At this time, the sealing surface is The effective sealing pressure is equal to the sum of the pre-pressure of the sealing ring due to elastic deformation and the hydraulic oil pressure: when there is no internal pressure, the contact pressure with the sealing surface 9 is equal to the pre-pressure of elastic deformation; when there is internal pressure, the bottom of the lip ring will be affected Axial compression,...

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Abstract

The invention discloses a sealing unit, which is installed between a piston rod and a hydraulic oil cylinder, and includes a guide sleeve and a Y-shaped sealing ring. An oil inlet is arranged on the guide sleeve corresponding to the opening of the inner cavity of the Y-shaped sealing ring. The mouth is located between the end face of the guide sleeve and the sealing groove. The invention is a sealing assembly based on a Y-shaped ring, which solves the problems of poor sealing and low moving speed of a hydraulic oil cylinder in frequent reciprocating motion, reduces wear and improves the sealing compensation effect on the wear part. The present invention eliminates the hidden danger of Y-shaped sealing ring oil passage by setting the oil inlet; the present invention also reduces the wear of the inner wall of the cylinder by setting the support ring, improves the sealing performance and service life of the hydraulic oil cylinder, and reduces the maintenance cost Adopt the numerically controlled machine tool hydraulic balance oil cylinder of the present invention, the life-span increase is about 4 times (more than 8 years) of the original design, and the maximum movement speed increases about 3 times of the original design (working pressure P≤32MPa, 15m / s).

Description

technical field [0001] The invention relates to the field of hydraulic machinery, in particular to the technical field of sealing hydraulic cylinders. Background technique [0002] Hydraulic cylinders are widely used in many heavy industrial fields such as cranes, excavators, support devices at the top of tunnels, and balancing of heavy moving parts. Its performance indicators such as output force, life, fuel consumption, etc. mainly depend on the sealing of the cylinder, and the sealing device is a key component of the entire hydraulic cylinder. [0003] The sealing requirements of hydraulic cylinders for different purposes are also different. For hydraulic cylinders with frequent reciprocating piston rods, the sealing device will bear alternating loads for a long time and is easy to wear. A typical example is the hydraulic balance cylinder of the spindle box of a CNC machine tool. When the machine tool When working, the piston rod of the balance oil cylinder will make fre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/32F16J15/3232F16J15/3268
Inventor 刘大炜唐金涛乔永忠
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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