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Dongguan Minz Rubber & Plastics Co., Ltd.

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What are the advantages of rubber O-rings compared to other seals?

Release time:

2019-05-25 12:30

Source:

Compared with other sealing rings,Rubber O-ringWhat are the advantages?
 
O-ring O-ring (O-rings) is a rubber sealing ring with a circular cross section. Because its cross section is O-shaped, it is called O-ring rubber sealing ring, also called O-ring. It first appeared in the middle of the 19th century, when it was used as a sealing element for steam engine cylinders.
 
Because it is inexpensive, simple to manufacture, reliable in function, and simple to install, O-rings are the most common mechanical design for sealing. O-rings withstand pressures of tens of megapascals. O-rings can be used in static applications, but also in dynamic applications where there is relative movement between components, such as the shaft of a rotary pump and the piston of a hydraulic cylinder.
 
Rubber O-ring is a kind of sealing parts installed on various mechanical equipment, in the specified temperature, pressure, and different liquid and gas media, in the static or moving state.
The friction resistance of the O-ring is small, and the dynamic and static friction forces are equal, which is 1/2 of the friction force of the rubber ring; 1/4, which can eliminate the movement under low speed and low pressure; Crawling phenomenon. Phase II It also has high wear resistance and automatic elastic compensation function after the sealing surface is worn. And good self-lubricating performance, can be used for oil-free lubrication seal. The structure of the O-ring is very simple and easy to install. Its working pressure is usually: 0-300MPa, working speed: 15 m/s, working temperature between -55-250 degrees.
 
Compared with other types of sealing rings, O-ring has many advantages: it is suitable for a variety of sealing forms, including static sealing, dynamic sealing, and suitable for various uses of materials, its size and groove have been standardized, and the interchangeability is very strong. And it is also suitable for a variety of different sealing media, such as: oil, water, gas, chemical media or other mixed media through the selection of appropriate rubber materials and appropriate formula design, to achieve oil, water, air, gas and a variety of chemical media effective sealing effect.
 
O-ring has the following scope of application: it is suitable for installation on various mechanical equipment, in the specified temperature, pressure, and different liquid and gas media, in the static or moving state to play a sealing role; In machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, construction machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and various instruments and meters, various types of sealing elements are used in a large number of applications.
 
O-ring seal is mainly used for static seal and reciprocating motion seal. When used for rotary motion sealing, it is limited to low-speed rotary sealing devices. O-ring seal is generally installed in the outer circle or inner circle on the cross-section of the rectangular groove from the sealing effect. O-ring in the oil, acid and alkali, grinding, chemical erosion and other environments still play a good sealing, shock absorption. Therefore, O-ring is the most widely used seal in hydraulic and pneumatic transmission system.
So, what are the advantages of the O-ring?
 
O type sealing ring compared with other types of sealing ring, has the following advantages:
1. Suitable for a variety of sealing forms: static sealing, dynamic sealing
2, suitable for a variety of materials, size and groove have been standardized, strong interchangeability.
3. Suitable for a variety of motion modes: rotary motion, axial reciprocating motion or combined motion (such as rotary reciprocating combined motion)
4. Suitable for a variety of different sealing media: oil, water, gas, chemical media or other mixed media. Through the selection of appropriate rubber materials and appropriate formula design, to achieve oil, water, air, gas and a variety of chemical media effective sealing effect. The temperature range is wide (-60 ℃ ~ 220 ℃), and the pressure can reach 1500Kg/cm2 when fixed.
5. Simple design, compact structure and convenient assembly and disassembly. O-ring section structure is extremely simple, and has a self-sealing effect, reliable sealing performance. Because the O-ring itself and the installation site structure are extremely simple, and has been standardized, so the installation and replacement are very easy.
6. There are many varieties of materials. Can be selected according to different fluids: nitrile rubber (NBR), fluorine rubber (FKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM), chloroprene rubber (CR), butyl rubber (BU), polytetrafluoroethylene (PTFE), natural rubber (NR), etc.
7, low cost
8. The dynamic friction resistance is relatively small

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