Analyze The Relationship Between The Deformation Of The Standard O Rings And The Compression Rate

- Oct 13, 2017-

Standard O Rings of the compression rate and the amount of stretch are inextricably linked. Standard O Rings The longer the use time, the greater the compression ratio and the amount of elongation, the greater the stress drop due to the stress relaxation of the rubber, resulting in a lack of elasticity of the Standard O Rings. The compressive stress relaxation occurs in the compressed state, and the compressive stress decreases with time.
People in the calculation of compression rate, often overlooked the Standard O Rings in the assembly caused by stretching the height of the reduction. Standard O Rings The change in cross-sectional area is inversely proportional to the change in its circumference. At the same time, due to the role of tension, Standard O Rings cross-sectional shape will change, it shows the height of the reduction. In addition, under the surface tension, the outer surface of Standard O Rings becomes more flat, that is, the cross-section height is slightly reduced. Increasing the cross section of Standard O Rings is the easiest way to reduce the compression ratio, but this increases the size of the structure.
Standard O Rings in the same amount of elongation, the hardness of the Standard O Rings, the cross-section height is also reduced more, from this point of view, should be used in accordance with the conditions of use of low hardness of the material. In the role of liquid pressure and tension, Standard O Rings O-ring will gradually plastic deformation, the cross-sectional height will be reduced accordingly.
When choosing Standard O Rings, you should pay attention to the contrast between the compression ratio and the amount of stretch, so that you can choose a good Standard O Rings, you can extend the use of time, and will not lead to leakage in advance.
Standard O Rings troughs are generally designed and manufactured according to common accessories, and can also be designed and manufactured according to customer requirements. The groove design includes determining the shape, size, accuracy and surface roughness of the groove.
Standard O Rings groove design principles are: easy processing, size given reasonable, easy to ensure accuracy, Standard O Rings assembly and removal more convenient and so on. Common groove shape for the rectangular groove
The groove can not be too narrow, and if the Standard O Rings section fills the section of the slot (which is the narrowest limit), the frictional resistance at the time of movement will be particularly large because Standard O Rings can not roll and cause severe wear The
The slot should not be too wide, because it is too wide. Standard O Rings are very large and easy to wear. In the case of a special static seal, if the working pressure is pulsating, the static seal will be "no static" and it will swim at the same pulsating frequency in an unfavorable wide groove, with abnormal wear, Standard O Rings damage.
The depth of the Standard O Rings is the critical size of the Standard O Rings's ability to work well, depending on the amount of compression deformation of the Standard O Rings. The amount of groove compression varies depending on the quality of the material and whether the product meets the requirements of the product.
Standard O Rings may be subject to changes in physical and chemical properties due to external environmental factors such as distortion, oxygen, ozone, light, heat, moisture, oil, or chemical solvents. The In DIN7716, ISO2230, DIN9088 and other standards on the rubber seal storage, cleaning, maintenance made the basic provisions.
1: Temperature: 5-25 ℃ is the ideal storage temperature. Avoid contact with heat and sunlight. The seal removed from the low temperature storage condition should be placed in an environment at 20 ° C before use.
2: Humidity: the relative humidity of the warehouse should be less than 70%, to avoid the Standard O Rings too wet or too dry, can not appear condensation phenomenon.
3: light: to avoid the sun and strong ultraviolet light with artificial light. UV-resistant Standard O Rings bags provide the best protection. It is recommended that the windows of the warehouse be painted with red or orange paint or film.
4: radiation: to avoid ionizing radiation damage to the seal.
5: Oxygen and Ozone: Standard O Rings should be avoided in circulating air. This may be achieved by packaging, winding, storing in an airtight container or other suitable means. Ozone for most of the bombs

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