Y-type seal:
Use:Widely used in reciprocating sealing device, its life is higher than the O-ring. Y-ring for the working pressure of not more than 40MPa, the working temperature of -30 ~ 80 ºC.
category:
Y-ring in accordance with the length of the cross-section ratio of different, can be divided into wide-type Y-ring, narrow-type Y-ring and Yx-ring and so on. Wide section of the Y-ring pressure resistance is slightly smaller than the narrow-type Y-ring, can only apply to P <20MPa working environment, and narrow-type Y-ring can be used for working pressure P <32MPa occasions.
Y-ring in accordance with the height of the two lips are the same, but also can be divided into shafts with unequal lip Y-ring, the hole with the unequal lip Y-ring and shaft hole common high-lip Y-type seal ring. Y-ring manufacturing materials are different, but also can be divided into nitrile rubber Y-ring, fluorine rubber Y-ring, polyurethane rubber Y-ring and so on. [1]
Working speed range: the use of small eyes rubber production is 0. 01 ~ 0.6m / s; with fluorine rubber production, the 0.05 ~ 0.3m / s; using polyurethane rubber production, compared with 0.01 ~ lm / s. Y-ring sealing performance, service life and the working pressure of different Dang Quan limit, with polyurethane rubber material is better.
Sealing principle:
The Y-ring seals against its sealing lip by its open lip. When there is no internal pressure, only a small contact pressure is generated due to deformation of the tip. In the case of sealing, there is a normal pressure equal to the pressure of the medium at each point of contact with the sealing medium so that the bottom of the lip ring will be compressed axially and the lip will be compressed in the circumferential direction to become wider in contact with the sealing surface, While the contact stress increases. When the internal pressure and then increased, the contact pressure distribution and size of the further changes in the lips and sealing surface with more closely, so better sealing, which is Y-ring "self-sealing effect." Because of this self-sealing effect, a Y-ring can effectively seal the high pressure of 32MPa.
The effective sealing pressure of the pressure-setting seal is equal to the sum of the pre-pressure and the fluid pressure. Y-shaped seal through the role of the lip will be effective in the role of the fluid pressure on the seal, the pre-pressure can be reduced to a small value, and the higher fluid pressure, the role of pre-pressure in the high-pressure, the role of pre-stress can be ignored Excluding. At this time, it is advantageous to reduce the sealing frictional force because the sealing frictional force is proportional to the sealing contact pressure. So Y-shaped seal to ensure that the seal at the same time, the friction is less than the squeeze-type seal.
Y-shaped ring is mainly used for reciprocating seal, its working principle, Y-ring installation, the lip to the side of the high pressure to play a role, so Y-shaped ring can only play a role.
When the coupling moves at relative speed, a sealing oil film is formed between the sealing lip and the sliding surface. The existence of the oil film can improve the friction condition of the sealing ring and reduce the wear. The oil film plays the role of sealing in the pneumatic sealing. In the reciprocating motion of the hydraulic element, the oil film thickness is different when the movable member is extended and retracted, and this accumulation of the film thickness difference causes the leakage. Therefore, the Y-ring normal work, there are very few leakage occurs, the reciprocating speed, the leakage volume. This is because the reciprocating speed, the frequency of reciprocating becomes very frequent, while the oil film fluid power to increase the film thickness, the formation of the rapid accumulation of oil film. When the viscosity of the working oil increases, the oil film thickness increases, the reciprocating speed caused by leakage also increased. However, as the hydraulic oil viscosity decreases with increasing temperature, so the hydraulic equipment starts at low temperatures, the beginning of the movement of the larger leakage, with the movement due to various losses caused by temperature increases, the leakage will gradually cut back.
Pistons in the reciprocating stroke of the leakage situation is different. When the internal pressure is low, the amount of leakage in the extraction stroke increases with the increase of internal pressure, and decreases with the increase of the internal pressure during the pressing stroke. When the internal pressure is large enough (about more than 7.5MPa), the leakage will no longer change with the internal pressure.
When the internal pressure p1 Y-ring is low, the friction increases with increasing internal pressure. When the internal pressure is large enough, the friction is no longer a great change. Such as good lubrication, or even a downward trend. Foreign start on the Y-ring friction test results show that the starting friction and parking time has little to do with the O-ring is the biggest difference.
This is extremely beneficial for intermittent moving machinery. At the same time, when the internal pressure is lower, the starting friction increases with the internal pressure, when the internal pressure exceeds 5MPa, the starting friction will be independent of the internal pressure. So for high-pressure intermittent machinery, there will be no starting friction is too large problem. Seal lip wear, due to the role of media pressure, lip with a certain degree of automatic compensation.
Material:
NBR nitrile rubber - suitable for oil hydraulic oil, glycol hydraulic oil, diester lubricants, gasoline, water, silicon grease, silicone oil and other media used. Is the most widely used, the lowest cost of rubber seals. Not suitable for polar solvents, such as ketones, ozone, nitrohydrocarbons, MEK and chloroform. General use temperature range of -40 ~ 120 ºC.
HNBR hydrogenated nitrile rubber - has excellent corrosion resistance, tear resistance and compression deformation characteristics, ozone resistance, sunlight resistance, weather resistance is better. Better than the nitrile rubber abrasion resistance. It is suitable for use in washing machines, automobile engine systems and refrigeration systems using the new environmentally friendly refrigerant R134a. Is not recommended for use in alcohols, esters or aromatic solution. General use temperature range of -40 ~ 150 ºC.
SIL silicone rubber - has excellent heat resistance, cold resistance, ozone resistance, resistance to atmospheric aging properties. Has a good insulation properties. But the tensile strength than the average rubber and not with oil resistance. Applicable to household appliances such as electric water heaters, electric irons, microwave ovens and so on. Also applies to a variety of contact with the human body supplies, such as water bottles, drinking fountains and so on. It is not recommended for use in most concentrated solvents, oils, concentrated acids and sodium hydroxide. General use temperature range of -55 ~ 250 ºC.
VITON Fluorine rubber - high temperature resistance is better than silicone rubber, has excellent weather resistance, ozone resistance and chemical resistance, cold resistance is bad. For most of the oil and solvents are resistant, especially acids, aliphatic hydrocarbons, aromatic hydrocarbons and animal and vegetable oils. Suitable for diesel engine, fuel system and chemical plant sealing needs. Not recommended for use in ketones, low molecular weight esters and mixtures containing nitric acid. General use temperature range of -20 ~ 250 ºC.
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