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Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.

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Dongguan Minz Rubber & Plastics Co., Ltd.

Add.: No.4, New Industrial Road, Shipai Tangwei, shipai town, Dongguan City
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Contact: Miss Li +86-136 6988 8704
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Characteristics and application scope of O-shaped rubber sealing ring

Release time:

2019-05-21 12:30

Source:

O-ring rubber sealFeatures and scope of application
 
O-type rubber sealing ring is composed of a low friction filled polytetrafluoroethylene (PTFE) ring and O-type rubber sealing ring. O-ring provides sufficient sealing preload and compensates for the wear of PTFE ring. PTFE friction coefficient is small, dynamic and static friction coefficient is similar. Suitable for high and low speed reciprocating motion and high pressure system of cylinder piston rod seal. Two stepped seals are used to achieve zero leakage.
Features of 1. rubber O-ring:
1. Simple structure, good sealing performance, O-shaped rubber sealing ring section structure is extremely simple, and has a self-sealing effect, reliable sealing performance.
2, easy installation Because the O-type rubber seal ring itself and the installation site structure are extremely simple, and has been standardized, so the installation and replacement are very easy.
3, wide range of application through the selection of appropriate rubber materials and appropriate formula design, to achieve oil, water, air, gas and various chemical media effective sealing effect. The temperature range is wide -60 ℃ ~ 220 ℃), and the pressure can reach 1500Kg/cm2 when fixed (used with reinforcing ring).
4, rich variety of materials suitable for various purposes, size and groove have been standardized.
 
The application range of 2. O-shaped rubber sealing ring: O-shaped rubber sealing ring is widely used in diesel locomotives, automobiles, tractors, construction machinery, machine tools and various hydraulic and pneumatic components. It can bear the sealing of fixed, reciprocating and rotating motion. O-shaped rubber sealing ring accounts for more than 50% of the sealing of mechanical products. According to the need, can produce for high temperature, low temperature vacuum, high pressure and different media of a variety of special purpose sealing ring and shaped rubber sealing products.
 
 Design of Pressure Compensation Type for O-ring Hole
Generally speaking, O-ring seal is only used for fixed seal and low pressure (below 2.5MPa) movement seal. For medium and high pressure movement seal, Y-type, U-type, V-type and other lip sealing rings with compensation are used.
 
For the use of hydraulic equipment units, often because of each.The type of belt compensates for the shortage of sealing rings and affects production. The pressure compensation structure for the shaft of the O-ring seal is widely used in the cylinder piston seal; and the cylinder port and the piston rod seal are also Y-shaped, U-shaped, V-shaped and other compensation-type sealing rings, and can we still use ordinary O-rings? To solve the seal between the cylinder port and the piston rod?
 
I have done the following design tests: typical cylinder port and piston rod seal, is the use of commonly used Y-shaped, U-shaped sealing ring. First of all, the nature of this seal is simply analyzed: the lip (outer lip) in contact with the cylinder is actually a fixed seal; the lip (inner lip) in contact with the piston rod is a motion seal. The principle of using ordinary O-ring to solve the sealing between piston rod and cylinder port is designed.
 
It uses two ordinary O-rings, one is a fixed seal; the other is in contact with the piston rod and placed in the conical surface of the O-ring is a sports sealing ring; it increases with the pressure, the pressure The stronger the force plays the role of compensation seal. In this structure, a sealing ring seat sleeve is installed in the space where the Y-shaped sealing ring was originally placed, and a sink groove is installed in the outer circle car to place the O-shaped sealing ring for fixed sealing. Its requirements are designed according to the fixed sealing requirements; The matching requirements of the outer circle size and the cylinder mouth are dynamic matching;
 
The dimension of inner hole D is also in dynamic fit with the piston rod. The thickness H is equal to the thickness of the original installed Y-shaped sealing ring and the actual space dimension is minus 0.1~0.2mm; The inner hole is shaped into a 60 conical surface, and its smoothness requirement is slightly higher (Ra3.2 or more is required); The d1 dimension of the big end of the conical surface is the diameter of the piston rod plus twice the section diameter of the sealing ring used; The remaining roughness Ra6.3; in addition, the inner diameter of the O-ring for motion sealing on the piston rod and the conical surface should be less than the diameter of the piston rod by 1~5mm, and the cross-sectional diameter should be as large as possible.
 
Through the use of hydraulic systems such as hydraulic excavators (pressure about 20MPa), Broaching machines (pressure about 10MPa), bending machines (pressure about 15MPa) and combined machine tools (about 2MPa) for nearly half a year, the performance is very good and there is no oil leakage at all.
 
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Dongguan Silicone Products Factory emphasizes that the product is made of silica gel. What is the reason?

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