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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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High-quality performance of ultra-high pressure large gap sealing ring

Release time:

2019-05-25 12:30

Source:

super high pressure large clearanceSealing ringHigh quality performance
 
In the ultra-high pressure large gap seal ring, the main reason for the failure of the seal is that the sealing element is squeezed into the gap and destroyed. To this end, we have developed several seal support rings with good compensation performance, including their low friction factor, low elastic modulus materials and special structural forms.
 
The upper part of the sealing element is high-pressure oil, and the lower part is supported on the support. Under the action of high-pressure oil, the seal is flattened and tightly attached to the cylinder wall to achieve sealing. At the same time, the seal transmits the oil pressure to the inside of the support ring, causing it to expand outward under pressure, just compensating for the increased gap due to the deformation of the cylinder, thereby preventing the seal from being squeezed into the gap.
 
For large tonnage hydraulic cylinder with ultra-high pressure and large gap sealing ring, in addition to the above strength and fatigue problems, the sealing of ultra-high pressure oil is also a difficult problem. The inner diameter of the large-tonnage hydraulic cylinder is large. When the inner wall produces the same strain value, the absolute expansion of the inner diameter is proportional to the size of the inner diameter. For example, for a 350MN working cylinder, the expansion of the unilateral cylinder wall can reach 1.8-2.0mm, and the maximum unilateral clearance can reach 2.5mm with the gap reserved for assembly.
 
The inner diameter of large tonnage hydraulic cylinder with ultra-high pressure and large gap sealing ring is large. When the inner wall produces the same strain value, the absolute expansion of the inner diameter is proportional to the size of the inner diameter. For example, for a 350MN working cylinder, the expansion of the unilateral cylinder wall can reach 1.8-2.0mm, and the maximum unilateral clearance can reach 2.5mm with the gap reserved for assembly.
 
In the ultra-high pressure seal with such a large gap, the main reason for the failure of the seal is that the seal is squeezed into the gap and destroyed. For this reason, we have developed several seal support rings with good compensation performance, that is, the ultra-high pressure seal expansion ring with pre-designed expansion amount of Patent No. 85203618, including its low friction factor, low elastic modulus material and special structure.
 
The upper part of the seal is high-pressure oil, and the lower part is supported on the support. Under the action of high-pressure oil, the seal is flattened and tightly attached to the cylinder wall to achieve a sealing effect. At the same time, the seal transmits the oil pressure to the inside of the support ring, causing it to expand outward under pressure, just compensating for the increased gap due to the deformation of the cylinder, thereby preventing the seal from being squeezed into the gap.
After understanding the types of sealing rings, the device requirements should also be known.
 
On the one hand, the seal ring contains a lot of knowledge, so we still have to continue to learn in this area, so that we can continue to learn and understand, so that we can master its knowledge. Moreover, this work can increase our knowledge in this area and broaden our horizons. Therefore, it is very good for us and can let us learn a lot of useful knowledge. Then, let's start with the specific content.
 
That is, what are the types of seals, the problem in front of the small series has been explained in detail, so here is not repeated, but to introduce some of the contents of the front has not, so that we can better understand the seal ring.
 
Sealing ring, it is mainly to prevent the leakage of the hydraulic system, the device has some requirements, so what are the main ones.
The device requirements of the sealing ring mainly include:
 
(1) The sealing ring should have very good sealing performance within a certain working pressure and temperature range. And, as the pressure increases, it can automatically improve its sealing performance.
 
(2) The friction between the sealing ring device and the moving parts should be relatively small, and the friction coefficient should be stable.
 
(3) Its corrosion resistance is better, and it is not easy to age, and its service life is long.
 
 
(4) To a certain extent, it can automatically compensate.

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